General description

The PCA9545A is a quad bi-directional translating switch controlled via the I

C-bus. The

SCL/SDA upstream pair fans out to four downstream pairs, or channels. Any individual
SCx/SDx channel or combination of channels can be selected, determined by the
contents of the programmable control register. Four interrupt inputs, INT0 to INT3, one for
each of the downstream pairs, are provided. One interrupt output, INT, acts as an AND of
the four interrupt inputs.

An active LOW reset input allows the PCA9545A to recover from a situation where one of
the downstream I

C-buses is stuck in a LOW state. Pulling the RESET pin LOW resets the

C-bus state machine and causes all the channels to be deselected as does the internal

Power-on reset function.

The pass gates of the switches are constructed such that the V

pin can be used to limit

the maximum high voltage which will be passed by the PCA9545A. This allows the use of
different bus voltages on each pair, so that 1.8 V or 2.5 V or 3.3 V parts can communicate
with 5 V parts without any additional protection. External pull-up resistors pull the bus up
to the desired voltage level for each channel. All I/O pins are 5 V tolerant.

Features

1-of-4 bi-directional translating switches

C-bus interface logic; compatible with SMBus standards

4 active LOW interrupt inputs

Active LOW interrupt output

Active LOW reset input

2 address pins allowing up to 4 devices on the I

C-bus

Channel selection via I

C-bus, in any combination

Power-up with all switch channels deselected

Low R

switches

Allows voltage level translation between 1.8 V, 2.5 V, 3.3 V and 5 V buses

No glitch on power-up

Supports hot insertion

Low stand-by current

Operating power supply voltage range of 2.3 V to 5.5 V

5 V tolerant Inputs

0 kHz to 400 kHz clock frequency

ESD protection exceeds 2000 V HBM per JESD22-A114, 200 V MM per
JESD22-A115, and 1000 V CDM per JESD22-C101

Latch-up protection exceeds 100 mA per JESD78

PCA9545A

4-channel I

C switch with interrupt logic and reset

Rev. 03 -- 3 March 2005

Product data sheet

9397 750 14311

Product data sheet

Rev. 03 -- 3 March 2005

2 of 27

Philips Semiconductors

PCA9545A

4-channel I

C switch with interrupt logic and reset

Three packages offered: SO20, TSSOP20, and HVQFN20

Ordering information

Standard packing quantities and other packaging data are available at

www.standardproducts.philips.com/packaging

Marking

Table 1:

Ordering information

amb

= 40

C to +85

Type number

Package

Name

Description

Version

PCA9545ABS

HVQFN20

plastic thermal enhanced very thin quad flat package;
no leads; 20 terminals; body 5

0.85 mm

SOT662-1

PCA9545AD

SO20

plastic small outline package; 20 leads;
body width 7.5 mm

SOT163-1

PCA9545APW

TSSOP20

plastic thin shrink small outline package; 20 leads;
body width 4.4 mm

SOT360-1

Table 2:

Marking codes

Type number

Topside mark

PCA9545ABS

9545A

PCA9545AD

PCA9545APW

PA9545A

9397 750 14311

Product data sheet

Rev. 03 -- 3 March 2005

4 of 27

Philips Semiconductors

PCA9545A

4-channel I

C switch with interrupt logic and reset

Pinning information

6.1 Pinning

6.2 Pin description

Fig 2.

Pin configuration for SO20

Fig 3.

Pin configuration for TSSOP20

Fig 4.

Pin configuration for HVQFN20 (transparent top view)

PCA9545AD

SDA

RESET

SCL

INT0

INT

SD0

SC3

SC0

SD3

INT1

INT3

SD1

SC2

SC1

SD2

INT2

002aab165

SDA

SCL

INT

SC3

SD3

INT3

SC2

SD2

INT2

RESET

INT0

SD0

SC0

INT1

SD1

SC1

PCA9545APW

002aab166

SDA

SCL

INT

SC3

SD3

INT3

SC2

RESET

INT0

SD0

SC0

INT1

SD1

SC1

002aab167

PCA9545ABS

Transparent top view

terminal 1

index area

SD2

INT2

Table 3:

Pin description

Symbol

Pin

Description

SO, TSSOP

HVQFN

address input 0

address input 1

RESET

active LOW reset input

INT0

active LOW interrupt input 0

SD0

serial data 0

SC0

serial clock 0

INT1

active LOW interrupt input 1

SD1

serial data 1

9397 750 14311

Product data sheet

Rev. 03 -- 3 March 2005

5 of 27

Philips Semiconductors

PCA9545A

4-channel I

C switch with interrupt logic and reset

[1]

HVQFN package die supply ground is connected to both the V

pin and the exposed center pad. The V

pin must be connected to supply ground for proper device operation. For enhanced thermal, electrical, and
board-level performance, the exposed pad needs to be soldered to the board using a corresponding
thermal pad on the board, and for proper heat conduction through the board thermal vias need to be
incorporated in the PCB in the thermal pad region.

Functional description

Refer to

Figure 1 "Block diagram of PCA9545A" on page 3

7.1 Device address

Following a START condition, the bus master must output the address of the slave it is
accessing. The address of the PCA9545A is shown in

Figure 5

. To conserve power, no

internal pull-up resistors are incorporated on the hardware selectable address pins and
they must be pulled HIGH or LOW.

The last bit of the slave address defines the operation to be performed. When set to
logic 1, a read is selected while a logic 0 selects a write operation.

SC1

serial clock 1

[1]

supply ground

INT2

active LOW interrupt input 2

SD2

serial data 2

SC2

serial clock 2

INT3

active LOW interrupt input 3

SD3

serial data 3

SC3

serial clock 3

INT

active LOW interrupt output

SCL

serial clock line

SDA

serial data line

supply voltage

Table 3:

Pin description

...continued

Symbol

Pin

Description

SO, TSSOP

HVQFN

Fig 5.

Slave address

002aab169

A0 R/W

fixed

hardware

selectable

9397 750 14311

Product data sheet

Rev. 03 -- 3 March 2005

6 of 27

Philips Semiconductors

PCA9545A

4-channel I

C switch with interrupt logic and reset

7.2 Control register

Following the successful acknowledgement of the slave address, the bus master will send
a byte to the PCA9545A, which will be stored in the control register. If multiple bytes are
received by the PCA9545A, it will save the last byte received. This register can be written
and read via the I

C-bus.

7.2.1 Control register definition

One or several SCx/SDx downstream pair, or channel, is selected by the contents of the
control register. This register is written after the PCA9545A has been addressed. The
4 LSBs of the control byte are used to determine which channel is to be selected. When a
channel is selected, the channel will become active after a STOP condition has been
placed on the I

C-bus. This ensures that all SCx/SDx lines will be in a HIGH state when

the channel is made active, so that no false conditions are generated at the time of
connection.

Remark: Several channels can be enabled at the same time. Example: B3 = 0, B2 = 1,
B1 = 1, B0 = 0, means that channel 0 and channel 3 are disabled and channel 1 and
channel 2 are enabled. Care should be taken not to exceed the maximum bus capacity.

Fig 6.

Control register

002aab170

INT

channel selection bits
(read/write)

interrupt bits
(read only)

channel 0
channel 1
channel 2
channel 3
INT0
INT1
INT2
INT3

Table 4:

Control register: Write--channel selection; Read--channel status

INT3

INT2

INT1

INT0

Command

channel 0 disabled

channel 0 enabled

channel 1 disabled

channel 1 enabled

channel 2 disabled

channel 2 enabled

channel 3 disabled

channel 3 enabled

no channel selected;
power-up/reset default state

9397 750 14311

Product data sheet

Rev. 03 -- 3 March 2005

7 of 27

Philips Semiconductors

PCA9545A

4-channel I

C switch with interrupt logic and reset

7.2.2 Interrupt handling

The PCA9545A provides 4 interrupt inputs, one for each channel, and one open-drain
interrupt output. When an interrupt is generated by any device, it will be detected by the
PCA9545A and the interrupt output will be driven LOW. The channel does not need to be
active for detection of the interrupt. A bit is also set in the control register.

Bit 4 through bit 7 of the control register corresponds to channel 0 through channel 3 of
the PCA9545A, respectively. Therefore, if an interrupt is generated by any device
connected to channel 1, the state of the interrupt inputs is loaded into the control register
when a read is accomplished. Likewise, an interrupt on any device connected to
channel 0 would cause bit 4 of the control register to be set on the read. The master can
then address the PCA9545A and read the contents of the control register to determine
which channel contains the device generating the interrupt. The master can then
reconfigure the PCA9545A to select this channel, and locate the device generating the
interrupt and clear it.

It should be noted that more than one device can provide an interrupt on a channel, so it is
up to the master to ensure that all devices on a channel are interrogated for an interrupt.

The interrupt inputs may be used as general purpose inputs if the interrupt function is not
required.

If unused, interrupt input(s) must be connected to V

through a pull-up resistor.

Remark: Several interrupts can be active at the same time. Example: INT3 = 0, INT2 = 1,
INT1 = 1, INT0 = 0, means that there is no interrupt on channel 0 and channel 3, and
there is interrupt on channel 1 and channel 2.

7.3 RESET input

The RESET input is an active LOW signal which may be used to recover from a bus fault
condition. By asserting this signal LOW for a minimum of t

, the PCA9545A will reset its

registers and I

C-bus state machine and will deselect all channels. The RESET input must

be connected to V

through a pull-up resistor.

Table 5:

Control register: Read--interrupt

INT3

INT2

INT1

INT0

Command

no interrupt on channel 0

interrupt on channel 0

no interrupt on channel 1

interrupt on channel 1

no interrupt on channel 2

interrupt on channel 2

no interrupt on channel 3

interrupt on channel 3

9397 750 14311

Product data sheet

Rev. 03 -- 3 March 2005

8 of 27

Philips Semiconductors

PCA9545A

4-channel I

C switch with interrupt logic and reset

7.4 Power-On Reset

When power is applied to V

, an internal Power-On Reset (POR) holds the PCA9545A in

a reset condition until V

has reached V

POR

. At this point, the reset condition is released

and the PCA9545A registers and I

C-bus state machine are initialized to their default

states--all zeroes--causing all the channels to be deselected. Thereafter, V

must be

lowered below 0.2 V to reset the device.

7.5 Voltage translation

The pass gate transistors of the PCA9545A are constructed such that the V

voltage can

be used to limit the maximum voltage that will be passed from one I

C-bus to another.

Figure 7

shows the voltage characteristics of the pass gate transistors (note that the graph

was generated using the data specified in

Section 11 "Static characteristics"

of this data

sheet). In order for the PCA9545A to act as a voltage translator, the V

o(sw)

voltage should

be equal to, or lower than the lowest bus voltage. For example, if the main bus was
running at 5 V, and the downstream buses were 3.3 V and 2.7 V, then V

o(sw)

should be

equal to or below 2.7 V to effectively clamp the downstream bus voltages. Looking at

Figure 7

, we see that V

o(sw)(max)

will be at 2.7 V when the PCA9545A supply voltage is

3.5 V or lower, so the PCA9545A supply voltage could be set to 3.3 V. Pull-up resistors
can then be used to bring the bus voltages to their appropriate levels (see

Figure 14

More Information can be found in Application Note

AN262: PCA954X family of I2C/SMBus

multiplexers and switches.

(1) maximum

(2) typical

(3) minimum

Fig 7.

Pass gate voltage versus supply voltage

(V)

2.0

5.5

4.5

3.0

4.0

002aaa964

3.0

2.0

4.0

5.0

o(sw)

(V)

1.0

3.5

5.0

2.5

(1)

(2)

(3)

9397 750 14311

Product data sheet

Rev. 03 -- 3 March 2005

9 of 27

Philips Semiconductors

PCA9545A

4-channel I

C switch with interrupt logic and reset

Characteristics of the I

C-bus

The I

C-bus is for 2-way, 2-line communication between different ICs or modules. The two

lines are a serial data line (SDA) and a serial clock line (SCL). Both lines must be
connected to a positive supply via a pull-up resistor when connected to the output stages
of a device. Data transfer may be initiated only when the bus is not busy.

8.1 Bit transfer

One data bit is transferred during each clock pulse. The data on the SDA line must remain
stable during the HIGH period of the clock pulse as changes in the data line at this time
will be interpreted as control signals (see

Figure 8

8.2 START and STOP conditions

Both data and clock lines remain HIGH when the bus is not busy. A HIGH-to-LOW
transition of the data line, while the clock is HIGH is defined as the START condition (S).
A LOW-to-HIGH transition of the data line while the clock is HIGH is defined as the
STOP condition (P) (see

Figure 9

Fig 8.

Bit transfer

mba607

data line

stable;

data valid

change

of data

allowed

SDA

SCL

Fig 9.

Definition of START and STOP conditions

mba608

SDA

SCL

STOP condition

SDA

SCL

START condition

9397 750 14311

Product data sheet

Rev. 03 -- 3 March 2005

10 of 27

Philips Semiconductors

PCA9545A

4-channel I

C switch with interrupt logic and reset

8.3 System configuration

A device generating a message is a `transmitter', a device receiving is the `receiver'. The
device that controls the message is the `master' and the devices which are controlled by
the master are the `slaves' (see

Figure 10

8.4 Acknowledge

The number of data bytes transferred between the START and the STOP conditions from
transmitter to receiver is not limited. Each byte of eight bits is followed by one
acknowledge bit. The acknowledge bit is a HIGH level put on the bus by the transmitter,
whereas the master generates an extra acknowledge related clock pulse.

A slave receiver which is addressed must generate an acknowledge after the reception of
each byte. Also a master must generate an acknowledge after the reception of each byte
that has been clocked out of the slave transmitter. The device that acknowledges has to
pull down the SDA line during the acknowledge clock pulse, so that the SDA line is stable
LOW during the HIGH period of the acknowledge related clock pulse; setup and hold
times must be taken into account.

A master receiver must signal an end of data to the transmitter by not generating an
acknowledge on the last byte that has been clocked out of the slave. In this event, the
transmitter must leave the data line HIGH to enable the master to generate a STOP
condition.

Fig 10. System configuration

002aaa966

MASTER

TRANSMITTER/

RECEIVER

SLAVE

RECEIVER

SLAVE

TRANSMITTER/

RECEIVER

MASTER

TRANSMITTER

MASTER

TRANSMITTER/

RECEIVER

SDA

SCL

MULTIPLEXER

SLAVE

Fig 11. Acknowledgement on the I

C-bus

002aaa987

START

condition

clock pulse for

acknowledgement

not acknowledge

acknowledge

data output

by transmitter

data output

by receiver

SCL from master

9397 750 14311

Product data sheet

Rev. 03 -- 3 March 2005

11 of 27

Philips Semiconductors

PCA9545A

4-channel I

C switch with interrupt logic and reset

8.5 Bus transactions

Data is transmitted to the PCA9545A control register using the Write mode as shown in

Figure 12

Data is read from PCA9545A using the Read mode as shown in

Figure 13

Fig 12. Write control register

Fig 13. Read control register

002aab172

slave address

START condition

R/W

acknowledge
from slave

acknowledge

from slave

control register

SDA

STOP condition

002aab173

INT3 INT2 INT1 INT0 B3

slave address

START condition

R/W

acknowledge
from slave

no acknowledge

from master

control register

SDA

STOP condition

last byte

9397 750 14311

Product data sheet

Rev. 03 -- 3 March 2005

12 of 27

Philips Semiconductors

PCA9545A

4-channel I

C switch with interrupt logic and reset

Application design-in information

(1) If the device generating the interrupt has an open-drain output structure or can be 3-stated, a

pull-up resistor is required.

If the device generating the interrupt has a totem-pole output structure and cannot be 3-stated,
a pull-up resistor is not required.

The interrupt inputs should not be left floating.

Fig 14. Typical application

PCA9545A

SD0

SC0

SDA

SCL

RESET

= 3.3 V

= 2.7 V to 5.5 V

C/SMBus master

002aab171

SDA

SCL

channel 0

V = 2.7 V to 5.5 V

INT

INT0

see note

(1)

SD1

SC1

channel 1

V = 2.7 V to 5.5 V

INT1

see note

(1)

SD2

SC2

channel 2

V = 2.7 V to 5.5 V

INT2

see note

(1)

SD3

SC3

channel 3

V = 2.7 V to 5.5 V

INT3

see note

(1)

9397 750 14311

Product data sheet

Rev. 03 -- 3 March 2005

13 of 27

Philips Semiconductors

PCA9545A

4-channel I

C switch with interrupt logic and reset

10. Limiting values

[1]

The performance capability of a high-performance integrated circuit in conjunction with its thermal environment can create junction
temperatures which are detrimental to reliability. The maximum junction temperature of this integrated circuit should not exceed 150

Table 6:

Limiting values

In accordance with the Absolute Maximum Rating System (IEC 60134). Voltages are referenced to V

(ground = 0 V).

[1]

Symbol

Parameter

Conditions

Min

Max

Unit

supply voltage

0.5

+7.0

input voltage

0.5

+7.0

input current

output current

supply current

100

ground supply current

100

tot

total power dissipation

400

stg

storage temperature

+150

amb

operating ambient temperature

+85

9397 750 14311

Product data sheet

Rev. 03 -- 3 March 2005

14 of 27

Philips Semiconductors

PCA9545A

4-channel I

C switch with interrupt logic and reset

11. Static characteristics

[1]

For operation between published voltage ranges, refer to the worst-case parameter in both ranges.

[2]

must be lowered to 0.2 V in order to reset part.

Table 7:

Static characteristics

= 2.3 V to 3.6 V; V

= 0 V; T

amb

= 40

C to +85

C; unless otherwise specified.

See

Table 8 on page 15

for V

= 4.5 V to 5.5 V.

[1]

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

Supply

supply voltage

2.3

3.6

supply current

operating mode; V

= 3.6 V; no load;

= V

or V

; f

SCL

= 100 kHz

stb

standby current

standby mode; V

= 3.6 V; no load;

= V

or V

0.1

POR

power-on reset voltage

no load; V

= V

or V

[2]

1.6

2.1

Input SCL; input/output SDA

LOW-level input voltage

0.5

0.3V

HIGH-level input voltage

0.7V

LOW-level output current

= 0.4 V

= 0.6 V

leakage current

= V

or V

input capacitance

= V

Select inputs A0, A1, INT0 to INT3, RESET

LOW-level input voltage

0.5

0.3V

HIGH-level input voltage

0.7V

+ 0.5

input leakage current

pin at V

or V

input capacitance

= V

1.6

Pass gate

on-state resistance

= 3.67 V; V

= 0.4 V; I

= 15 mA

= 2.3 V to 2.7 V; V

= 0.4 V;

= 10 mA

o(sw)

switch output voltage

i(sw)

= V

= 3.3 V; I

o(sw)

= 100

1.9

i(sw)

= V

= 3.0 V to 3.6 V;

o(sw)

= 100

1.6

2.8

i(sw)

= V

= 2.5 V; I

o(sw)

= 100

1.5

i(sw)

= V

= 2.3 V to 2.7 V;

o(sw)

= 100

1.1

2.0

leakage current

= V

or V

input/output capacitance

= V

INT output

LOW-level output current

= 0.4 V

HIGH-level output current

+10

9397 750 14311

Product data sheet

Rev. 03 -- 3 March 2005

15 of 27

Philips Semiconductors

PCA9545A

4-channel I

C switch with interrupt logic and reset

[1]

For operation between published voltage ranges, refer to the worst-case parameter in both ranges.

[2]

must be lowered to 0.2 V in order to reset part.

Table 8:

Static characteristics

= 4.5 V to 5.5 V; V

= 0 V; T

amb

= 40

C to +85

C; unless otherwise specified.

See

Table 7 on page 14

for V

= 2.3 V to 3.6 V.

[1]

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

Supply

supply voltage

4.5

5.5

supply current

operating mode; V

= 5.5 V;

no load; V

= V

or V

;

SCL

= 100 kHz

100

stb

standby current

standby mode; V

= 5.5 V;

no load; V

= V

or V

0.3

POR

power-on reset voltage

no load; V

= V

or V

[2]

1.7

2.1

Input SCL; input/output SDA

LOW-level input voltage

0.5

0.3V

HIGH-level input voltage

0.7V

LOW-level output current

= 0.4 V

= 0.6 V

leakage current

= V

input capacitance

= V

Select inputs A0, A1, INT0 to INT3, RESET

LOW-level input voltage

0.5

0.3V

HIGH-level input voltage

0.7V

+ 0.5

input leakage current

= V

or V

input capacitance

= V

Pass gate

on-state resistance

= 4.5 V to 5.5 V; V

= 0.4 V;

= 15 mA

o(sw)

switch output voltage

i(sw)

= V

= 5.0 V;

o(sw)

= 100

3.6

i(sw)

= V

= 4.5 V to 5.5 V;

o(sw)

= 100

2.6

4.5

leakage current

= V

or V

input/output capacitance

= V

INT output

LOW-level output current

= 0.4 V

HIGH-level output current

+10

9397 750 14311

Product data sheet

Rev. 03 -- 3 March 2005

16 of 27

Philips Semiconductors

PCA9545A

4-channel I

C switch with interrupt logic and reset

12. Dynamic characteristics

[1]

Pass gate propagation delay is calculated from the 20

typical R

and the 15 pF load capacitance.

[2]

A device must internally provide a hold time of at least 300 ns for the SDA signal (referred to the V

IH(min)

of the SCL signal) in order to

bridge the undefined region of the falling edge of SCL.

[3]

= total capacitance of one bus line in pF.

[4]

Measurements taken with 1 k

pull-up resistor and 50 pF load.

Table 9:

Dynamic characteristics

Symbol

Parameter

Conditions

Standard-mode

C-bus

Fast-mode I

C-bus

Unit

Min

Max

Min

Max

propagation delay from SDA to SDn, or
SCL to SCn

0.3

[1]

0.3

[1]

SCL

SCL clock frequency

100

400

kHz

BUF

bus free time between a STOP and
START condition

4.7

1.3

HD;STA

hold time (repeated) START condition.
After this period, the first clock pulse is
generated.

4.0

0.6

LOW

LOW period of the SCL clock

4.7

1.3

HIGH

HIGH period of the SCL clock

4.0

0.6

SU;STA

setup time for a repeated START
condition

4.7

0.6

SU;STO

setup time for STOP condition

4.0

0.6

HD;DAT

data hold time

[2]

3.45

[2]

0.9

SU;DAT

data setup time

250

100

rise time of both SDA and SCL signals

1000

20 + 0.1C

[3]

300

fall time of both SDA and SCL signals

300

20 + 0.1C

[3]

300

capacitive load for each bus line

400

pulse width of spikes which must be
suppressed by the input filter

VD;DAT

data valid time

HIGH-to-LOW

[4]

LOW-to-HIGH

[4]

0.6

VD;ACK

data valid Acknowledge

INT

v(INTnN-INTN)

valid time from INTn to INT signal

d(INTnN-INTN)

delay time from INTn to INT inactive

100

w(rej)L

LOW-level rejection time

INTn inputs

w(rej)H

HIGH-level rejection time

INTn inputs

0.5

RESET

w(rst)L

LOW-level reset time

rst

reset time (SDA clear)

500

REC;STA

recovery time to START condition

9397 750 14311

Product data sheet

Rev. 03 -- 3 March 2005

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Philips Semiconductors

PCA9545A

4-channel I

C switch with interrupt logic and reset

Fig 15. Definition of timing on the I

C-bus

BUF

HD;STA

LOW

HD;DAT

HIGH

SU;DAT

SU;STA

HD;STA

SU;STO

SDA

SCL

002aaa986

Fig 16. Definition of RESET timing

SDA

SCL

002aab174

rst

50 %

30 %

50 %

REC;STA

w(rst)L

RESET

LEDx

LED off

START

rst

ACK or read cycle

Rise and fall times, refer to V

and V

Fig 17. I

C-bus timing diagram

SCL

SDA

HD;STA

SU;DAT

HD;DAT

BUF

SU;STA

LOW

HIGH

VD;ACK

002aab175

SU;STO

protocol

START

condition

(S)

bit 7

MSB

(A7)

bit 6
(A6)

bit 0

(R/W)

acknowledge

(A)

STOP

condition

(P)

SCL

VD;DAT

9397 750 14311

Product data sheet

Rev. 03 -- 3 March 2005

19 of 27

Philips Semiconductors

PCA9545A

4-channel I

C switch with interrupt logic and reset

14. Package outline

Fig 20. Package outline SOT163-1 (SO20)

UNIT

max.

(1)

REFERENCES

OUTLINE

VERSION

EUROPEAN

PROJECTION

ISSUE DATE

IEC

JEDEC

JEITA

inches

2.65

0.3
0.1

2.45
2.25

0.49
0.36

0.32
0.23

13.0
12.6

7.6
7.4

1.27

10.65
10.00

1.1
1.0

0.9
0.4

8
0

0.25

0.1

DIMENSIONS (inch dimensions are derived from the original mm dimensions)

Note

1. Plastic or metal protrusions of 0.15 mm (0.006 inch) maximum per side are not included.

1.1
0.4

SOT163-1

detail X

0.25

075E04

MS-013

pin 1 index

0.1

0.012
0.004

0.096
0.089

0.019
0.014

0.013
0.009

0.51
0.49

0.30
0.29

0.05

1.4

0.055

0.419
0.394

0.043
0.039

0.035
0.016

0.01

0.25

0.01

0.004

0.043
0.016

0.01

10 mm

scale

(A )

SO20: plastic small outline package; 20 leads; body width 7.5 mm

SOT163-1

99-12-27
03-02-19

Philips Semiconductors

PCA9545A

4-channel I

C switch with interrupt logic and reset

9397 750 14311

Product data sheet

Rev. 03 -- 3 March 2005

20 of 27

Fig 21. Package outline SOT360-1 (TSSOP20)

UNIT

(1)

(2)

(1)

REFERENCES

OUTLINE

VERSION

EUROPEAN

PROJECTION

ISSUE DATE

IEC

JEDEC

JEITA

0.15
0.05

0.95
0.80

0.30
0.19

0.2
0.1

6.6
6.4

4.5
4.3

0.65

6.6
6.2

0.4
0.3

0.5
0.2

8
0

0.13

0.1

0.2

DIMENSIONS (mm are the original dimensions)

Notes

1. Plastic or metal protrusions of 0.15 mm maximum per side are not included.

2. Plastic interlead protrusions of 0.25 mm maximum per side are not included.

0.75
0.50

SOT360-1

MO-153

99-12-27
03-02-19

0.25

pin 1 index

detail X

(A )

2.5

5 mm

scale

TSSOP20: plastic thin shrink small outline package; 20 leads; body width 4.4 mm

SOT360-1

max.

1.1

Philips Semiconductors

PCA9545A

4-channel I

C switch with interrupt logic and reset

9397 750 14311

Product data sheet

Rev. 03 -- 3 March 2005

21 of 27

Fig 22. Package outline SOT662-1 (HVQFN20)

0.65

UNIT

0.2

REFERENCES

OUTLINE

VERSION

EUROPEAN

PROJECTION

ISSUE DATE

IEC

JEDEC

JEITA

5.1
4.9

3.25
2.95

5.1
4.9

3.25
2.95

2.6

0.38
0.23

0.05
0.00

0.05

0.1

DIMENSIONS (mm are the original dimensions)

SOT662-1

MO-220

- - -

0.75
0.50

0.1

0.05

2.5

5 mm

scale

SOT662-1

HVQFN20: plastic thermal enhanced very thin quad flat package; no leads;
20 terminals; body 5 x 5 x 0.85 mm

(1)

max.

detail X

y1 C

terminal 1
index area

01-08-08
02-10-22

(1)

Note

1. Plastic or metal protrusions of 0.075 mm maximum per side are not included.

9397 750 14311

Product data sheet

Rev. 03 -- 3 March 2005

22 of 27

Philips Semiconductors

PCA9545A

4-channel I

C switch with interrupt logic and reset

15. Soldering

15.1 Introduction to soldering surface mount packages

This text gives a very brief insight to a complex technology. A more in-depth account of
soldering ICs can be found in our

Data Handbook IC26; Integrated Circuit Packages

(document order number 9398 652 90011).

There is no soldering method that is ideal for all surface mount IC packages. Wave
soldering can still be used for certain surface mount ICs, but it is not suitable for fine pitch
SMDs. In these situations reflow soldering is recommended.

15.2 Reflow soldering

Reflow soldering requires solder paste (a suspension of fine solder particles, flux and
binding agent) to be applied to the printed-circuit board by screen printing, stencilling or
pressure-syringe dispensing before package placement. Driven by legislation and
environmental forces the worldwide use of lead-free solder pastes is increasing.

Several methods exist for reflowing; for example, convection or convection/infrared
heating in a conveyor type oven. Throughput times (preheating, soldering and cooling)
vary between 100 seconds and 200 seconds depending on heating method.

Typical reflow peak temperatures range from 215

C to 270

C depending on solder paste

material. The top-surface temperature of the packages should preferably be kept:

below 225

C (SnPb process) or below 245

C (Pb-free process)

for all BGA, HTSSON..T and SSOP..T packages

for packages with a thickness

2.5 mm

for packages with a thickness < 2.5 mm and a volume

350 mm

so called

thick/large packages.

below 240

C (SnPb process) or below 260

C (Pb-free process) for packages with a

thickness < 2.5 mm and a volume < 350 mm

so called small/thin packages.

Moisture sensitivity precautions, as indicated on packing, must be respected at all times.

15.3 Wave soldering

Conventional single wave soldering is not recommended for surface mount devices
(SMDs) or printed-circuit boards with a high component density, as solder bridging and
non-wetting can present major problems.

To overcome these problems the double-wave soldering method was specifically
developed.

If wave soldering is used the following conditions must be observed for optimal results:

Use a double-wave soldering method comprising a turbulent wave with high upward
pressure followed by a smooth laminar wave.

For packages with leads on two sides and a pitch (e):

larger than or equal to 1.27 mm, the footprint longitudinal axis is preferred to be

parallel to the transport direction of the printed-circuit board;

9397 750 14311

Product data sheet

Rev. 03 -- 3 March 2005

23 of 27

Philips Semiconductors

PCA9545A

4-channel I

C switch with interrupt logic and reset

smaller than 1.27 mm, the footprint longitudinal axis must be parallel to the

transport direction of the printed-circuit board.

The footprint must incorporate solder thieves at the downstream end.

For packages with leads on four sides, the footprint must be placed at a 45

angle to

the transport direction of the printed-circuit board. The footprint must incorporate
solder thieves downstream and at the side corners.

During placement and before soldering, the package must be fixed with a droplet of
adhesive. The adhesive can be applied by screen printing, pin transfer or syringe
dispensing. The package can be soldered after the adhesive is cured.

Typical dwell time of the leads in the wave ranges from 3 seconds to 4 seconds at 250

or 265

C, depending on solder material applied, SnPb or Pb-free respectively.

A mildly-activated flux will eliminate the need for removal of corrosive residues in most
applications.

15.4 Manual soldering

Fix the component by first soldering two diagonally-opposite end leads. Use a low voltage
(24 V or less) soldering iron applied to the flat part of the lead. Contact time must be
limited to 10 seconds at up to 300

When using a dedicated tool, all other leads can be soldered in one operation within
2 seconds to 5 seconds between 270

C and 320

15.5 Package related soldering information

[1]

For more detailed information on the BGA packages refer to the

(LF)BGA Application Note (AN01026);

order a copy from your Philips Semiconductors sales office.

[2]

All surface mount (SMD) packages are moisture sensitive. Depending upon the moisture content, the
maximum temperature (with respect to time) and body size of the package, there is a risk that internal or
external package cracks may occur due to vaporization of the moisture in them (the so called popcorn
effect). For details, refer to the Drypack information in the

Data Handbook IC26; Integrated Circuit

Packages; Section: Packing Methods.

[3]

These transparent plastic packages are extremely sensitive to reflow soldering conditions and must on no
account be processed through more than one soldering cycle or subjected to infrared reflow soldering with
peak temperature exceeding 217

C measured in the atmosphere of the reflow oven. The package

body peak temperature must be kept as low as possible.

Table 10:

Suitability of surface mount IC packages for wave and reflow soldering methods

Package

[1]

Soldering method

Wave

Reflow

[2]

BGA, HTSSON..T

[3]

, LBGA, LFBGA, SQFP,

SSOP..T

[3]

, TFBGA, USON, VFBGA

not suitable

suitable

DHVQFN, HBCC, HBGA, HLQFP, HSO, HSOP,
HSQFP, HSSON, HTQFP, HTSSOP, HVQFN,
HVSON, SMS

not suitable

[4]

suitable

PLCC

[5]

, SO, SOJ

suitable

LQFP, QFP, TQFP

not recommended

[5] [6]

suitable

SSOP, TSSOP, VSO, VSSOP

not recommended

[7]

suitable

CWQCCN..L

[8]

, PMFP

[9]

, WQCCN..L

[8]

not suitable

9397 750 14311

Product data sheet

Rev. 03 -- 3 March 2005

24 of 27

Philips Semiconductors

PCA9545A

4-channel I

C switch with interrupt logic and reset

[4]

These packages are not suitable for wave soldering. On versions with the heatsink on the bottom side, the
solder cannot penetrate between the printed-circuit board and the heatsink. On versions with the heatsink
on the top side, the solder might be deposited on the heatsink surface.

[5]

If wave soldering is considered, then the package must be placed at a 45

angle to the solder wave

direction. The package footprint must incorporate solder thieves downstream and at the side corners.

[6]

Wave soldering is suitable for LQFP, QFP and TQFP packages with a pitch (e) larger than 0.8 mm; it is
definitely not suitable for packages with a pitch (e) equal to or smaller than 0.65 mm.

[7]

Wave soldering is suitable for SSOP, TSSOP, VSO and VSOP packages with a pitch (e) equal to or larger
than 0.65 mm; it is definitely not suitable for packages with a pitch (e) equal to or smaller than 0.5 mm.

[8]

Image sensor packages in principle should not be soldered. They are mounted in sockets or delivered
pre-mounted on flex foil. However, the image sensor package can be mounted by the client on a flex foil by
using a hot bar soldering process. The appropriate soldering profile can be provided on request.

[9]

Hot bar soldering or manual soldering is suitable for PMFP packages.

16. Abbreviations

Table 11:

Abbreviations

Acronym

Description

CDM

Charged Device Model

ESD

Electro Static Discharge

HBM

Human Body Model

Integrated Circuit

LSB

Least Significant Bit

Machine Model

MSB

Most Significant Bit

PCB

Printed-Circuit Board

POR

Power-On Reset

9397 750 14311

Product data sheet

Rev. 03 -- 3 March 2005

25 of 27

Philips Semiconductors

PCA9545A

4-channel I

C switch with interrupt logic and reset

17. Revision history

Table 12:

Revision history

Document ID

Release date

Data sheet status

Change notice

Doc. number

Supersedes

PCA9545A_3

20050303

Product data sheet

9397 750 14311

PCA9545A_2

Modifications:

The format of this data sheet has been redesigned to comply with the new presentation and
information standard of Philips Semiconductors.

Section 2 "Features" on page 1

: 9th bullet: changed "RDS

" to "R

Figure 4 "Pin configuration for HVQFN20 (transparent top view)" on page 4

: added pin 1

indicator notch and center pad.

Table 3 "Pin description" on page 4

: added

Table note 1

and its reference at HVQFN pin 8.

Section 7.5 "Voltage translation" on page 8

Figure 7

: title changed from "V

pass

voltage versus V

" to "Pass gate voltage versus supply

voltage"; within graphic changed "V

pass

(V)" to "V

o(sw)

(V)"

2nd paragraph: changed "V

pass

" to "V

o(sw)

"; changed "V

pass(max)

" to "V

o(sw)(max)

Table 6 "Limiting values" on page 13

: remove (old) table note [1], as it is now covered by

Section

19 "Definitions" on page 26

Table 7 "Static characteristics" on page 14

changed symbol "R

" to "R

"; changed parameter from "switch resistance" to "on-state

resistance"

changed symbol "V

pass

" to "V

o(sw)

under Conditions column for V

o(sw)

: changed "V

swin

" to "V

i(sw)

"; changed "I

swout

" to "I

o(sw)

Added (new)

Table note 1

Table 8 "Static characteristics" on page 15

changed symbol "R

" to "R

"; changed parameter from "switch resistance" to "on-state

resistance"

changed symbol "V

pass

" to "V

o(sw)

under Conditions column for V

o(sw)

: changed "V

swin

" to "V

i(sw)

"; changed "I

swout

" to "I

o(sw)

Table 9 "Dynamic characteristics" on page 16

changed symbol "t

" to "t

"; changed symbol "t

" to "t

" (also in

Figure 15 on page 17

)

changed symbols "t

VD;DATL

" and "t

VD;DATH

" to "t

VD;DAT

" and added Conditions indicating

HIGH-to-LOW and LOW-to-HIGH transitions

changed symbol "t

" to "t

v(INTnN-INTN)

" (also in

Figure 18 on page 18

)

changed symbol "t

" to "t

d(INTn-INTN)

" (also in

Figure 18 on page 18

)

changed symbol "L

pwr

" to "t

w(rej)L

changed symbol "H

pwr

" to "t

w(rej)H

changed symbol "t

WL(rst)

" to "t

w(rst)L

" (also in

Figure 16 on page 17

)

Added

Section 16 "Abbreviations"

PCA9545A_2

20040929

Objective data sheet

9397 750 13989

PCA9545A_1

20040728

Objective data sheet

9397 750 13309

Philips Semiconductors

PCA9545A

4-channel I

C switch with interrupt logic and reset

9397 750 14311

Product data sheet

Rev. 03 -- 3 March 2005

26 of 27

18. Data sheet status

[1]

Please consult the most recently issued data sheet before initiating or completing a design.

[2]

The product status of the device(s) described in this data sheet may have changed since this data sheet was published. The latest information is available on the Internet at
URL http://www.semiconductors.philips.com.

[3]

For data sheets describing multiple type numbers, the highest-level product status determines the data sheet status.

19. Definitions

Short-form specification -- The data in a short-form specification is
extracted from a full data sheet with the same type number and title. For
detailed information see the relevant data sheet or data handbook.

Limiting values definition -- Limiting values given are in accordance with
the Absolute Maximum Rating System (IEC 60134). Stress above one or
more of the limiting values may cause permanent damage to the device.
These are stress ratings only and operation of the device at these or at any
other conditions above those given in the Characteristics sections of the
specification is not implied. Exposure to limiting values for extended periods
may affect device reliability.

Application information -- Applications that are described herein for any
of these products are for illustrative purposes only. Philips Semiconductors
make no representation or warranty that such applications will be suitable for
the specified use without further testing or modification.

20. Disclaimers

Life support -- These products are not designed for use in life support
appliances, devices, or systems where malfunction of these products can
reasonably be expected to result in personal injury. Philips Semiconductors
customers using or selling these products for use in such applications do so
at their own risk and agree to fully indemnify Philips Semiconductors for any
damages resulting from such application.

Right to make changes -- Philips Semiconductors reserves the right to
make changes in the products - including circuits, standard cells, and/or
software - described or contained herein in order to improve design and/or
performance. When the product is in full production (status `Production'),
relevant changes will be communicated via a Customer Product/Process
Change Notification (CPCN). Philips Semiconductors assumes no
responsibility or liability for the use of any of these products, conveys no
license or title under any patent, copyright, or mask work right to these
products, and makes no representations or warranties that these products are
free from patent, copyright, or mask work right infringement, unless otherwise
specified.

21. Contact information

For additional information, please visit: http://www.semiconductors.philips.com

For sales office addresses, send an email to: sales.addresses@www.semiconductors.philips.com

Level

Data sheet status

[1]

Product status

[2] [3]

Definition

Objective data

Development

This data sheet contains data from the objective specification for product development. Philips
Semiconductors reserves the right to change the specification in any manner without notice.

Preliminary data

Qualification

This data sheet contains data from the preliminary specification. Supplementary data will be published
at a later date. Philips Semiconductors reserves the right to change the specification without notice, in
order to improve the design and supply the best possible product.

III

Product data

Production

This data sheet contains data from the product specification. Philips Semiconductors reserves the
right to make changes at any time in order to improve the design, manufacturing and supply. Relevant
changes will be communicated via a Customer Product/Process Change Notification (CPCN).

All rights are reserved. Reproduction in whole or in part is prohibited without the prior
written consent of the copyright owner. The information presented in this document does
not form part of any quotation or contract, is believed to be accurate and reliable and may
be changed without notice. No liability will be accepted by the publisher for any
consequence of its use. Publication thereof does not convey nor imply any license under
patent- or other industrial or intellectual property rights.

Date of release: 3 March 2005

Document number: 9397 750 14311

Published in The Netherlands

Philips Semiconductors

PCA9545A

4-channel I

C switch with interrupt logic and reset

22. Contents

General description . . . . . . . . . . . . . . . . . . . . . . 1

Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Ordering information . . . . . . . . . . . . . . . . . . . . . 2

Marking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Pinning information . . . . . . . . . . . . . . . . . . . . . . 4

6.1

Pinning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

6.2

Pin description . . . . . . . . . . . . . . . . . . . . . . . . . 4

Functional description . . . . . . . . . . . . . . . . . . . 5

7.1

Device address . . . . . . . . . . . . . . . . . . . . . . . . . 5

7.2

Control register . . . . . . . . . . . . . . . . . . . . . . . . . 6

7.2.1

Control register definition . . . . . . . . . . . . . . . . . 6

7.2.2

Interrupt handling . . . . . . . . . . . . . . . . . . . . . . . 7

7.3

RESET input . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

7.4

Power-On Reset . . . . . . . . . . . . . . . . . . . . . . . . 8

7.5

Voltage translation . . . . . . . . . . . . . . . . . . . . . . 8

Characteristics of the I

C-bus. . . . . . . . . . . . . . 9

8.1

Bit transfer . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

8.2

START and STOP conditions . . . . . . . . . . . . . . 9

8.3

System configuration . . . . . . . . . . . . . . . . . . . 10

8.4

Acknowledge . . . . . . . . . . . . . . . . . . . . . . . . . 10

8.5

Bus transactions . . . . . . . . . . . . . . . . . . . . . . . 11

Application design-in information . . . . . . . . . 12

Limiting values. . . . . . . . . . . . . . . . . . . . . . . . . 13

Static characteristics. . . . . . . . . . . . . . . . . . . . 14

Dynamic characteristics . . . . . . . . . . . . . . . . . 16

Test information . . . . . . . . . . . . . . . . . . . . . . . . 18

Package outline . . . . . . . . . . . . . . . . . . . . . . . . 19

Soldering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

15.1

Introduction to soldering surface mount
packages . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

15.2

Reflow soldering . . . . . . . . . . . . . . . . . . . . . . . 22

15.3

Wave soldering . . . . . . . . . . . . . . . . . . . . . . . . 22

15.4

Manual soldering . . . . . . . . . . . . . . . . . . . . . . 23

15.5

Package related soldering information . . . . . . 23

Abbreviations . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Revision history . . . . . . . . . . . . . . . . . . . . . . . . 25

Data sheet status . . . . . . . . . . . . . . . . . . . . . . . 26

Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

Disclaimers . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

Contact information . . . . . . . . . . . . . . . . . . . . 26

Part Number PCA9545A

Document Outline