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L9949

September 2002

ONE FULL BRIDGE FOR 6A LOAD (r

= 150m

)

THREE HALF BRIDGES FOR 1.6A LOAD
(r

= 800m

)

ONE HIGHSIDE DRIVER FOR 6A LOAD
(r

= 100m

)

VERY LOW CURRENT CONSUMPTION IN
STANDBY MODE (I

< 6µA, typ. Tj

85°C)

SERIAL PERIPHERAL INTERFACE (SPI) TO
MICROCONTROLLER

ALL OUTPUTS SHORT CIRCUIT PROTECTED

CURRENT MONITOR OUTPUT FOR FULL
BRIDGE AND HIGHSIDE DRIVER

ALL OUTPUTS OVER TEMPERATURE
PROTECTED

OPEN LOAD DIAGNOSTIC FOR ALL OUTPUTS

OVERLOAD DIAGNOSTIC FOR ALL OUTPUTS

APPLICATIONS

FOR AUTOMOTIVE APPLICATIONS, E.G.

FULL BRIDGE FOR DOOR LATCH OR
MIRROR RETRACT, HALF BRIDGES FOR
MIRROR AXIS CONTROL AND HIGH-SIDE
DRIVER FOR MIRROR DEFROSTER

DESCRIPTION

The L9949 is a microprocessor controlled power in-
terface for automotive applications. It is realized in
multipower BCD60III technology. Up to three DC mo-

PowerSO20

ORDERING NUMBER: L9949

DOOR ACTUATOR DRIVER

MULTIPOWER BCD60III TECHNOLOGY

BLOCK DIAGRAM

OUT1

OUT2

OUT3

OUT4

OUT5

OUT6

SPI

er Interf

ace & Diagnostic

CLK

CSN

Full bridge

Half bridge

Highside driver

Ground

e.g. for mirror retract
or door latch

e.g. for mirror
axis control

e.g. for mirror
defroster

MUX

V (battery)

L9949

2/20

tors and one grounded resistive load can be driven with its three half bridges, one full bridge and one highside
driver power outputs. The integrated standard serial peripheral interface (SPI) controls all operation modes (for-
ward, reverse, brake and high impedance). All diagnostic informations are available via the SPI.

Dual Power Supply: V

and V

The power supply voltage V

supplies the full bridge, the half bridges and the highside driver. An internal

charge-pump are used to drive the highside switches. The logic supply voltage V

(stabilized 5V) is used for

the logic part and the SPI of the device. Due to the independent logic supply voltage the control and status in-
formation will not be lost, if there are temporary spikes or glitches on the power supply voltage. In case of power-
on (V

increases from undervoltage to V

VCC OFF

= 4.2V) the circuit is initialized by an internally generated

power-on-reset (POR). If the voltage V

decreases under the minimum threshold (V

VCC ON

= 3.4V), the out-

puts are switched to tristate (high impedance) and the status registers are cleared.

Standby-Mode

The standby mode of the L9949 is activated by setting the bits 12 and 13 of the Input Data Register to zero. All
latched data will be cleared and the inputs and outputs are switched to high impedance. In the standby mode
the current at V

) is less than typ. 6µA (40µA) for CSN = high (DO in tristate). By switching the V

voltage

a very low quiescent current can be achieved. If one of the bits 12 and 13 are set to high, the device will be
switched to active mode.

Inductive Loads

Each half bridge is built by internally connected highside and a lowside power DMOS transistor. Due to the built-
in reverse diodes of the output transistors inductive loads can be driven at the outputs OUT1 to OUT5 without
external free-wheeling diodes. The highside driver OUT6 is intended to drive resistive loads only hence only a
limited energie (E<1mJ ) can be dissipated by the internal ESD-diode in freewheeling condition. For inductive
loads (L>100

H) an external free-wheeling diode connected to GND and OUT6 is needed.

Diagnostic Functions

All diagnostic functions (over/open load, power supply over-/undervoltage, temperature warning and thermal
shutdown) are internally filtered and the condition has to be valid for at least 10µs (0.5ms, respectively) before
the corresponding status bit in the status registers will be set. The filters are used to improve the noise immunity
of the device. The open load and temperature warning function are intended for information purpose and will
not change the state of the output drivers. In contrast, the overload and thermal shutdown condition will disable
the corresponding driver (overload) or all drivers (thermal shutdown), respectively. The microcontroller has to
clear the status bits to reactivate the corresponding drivers. This is to avoid an uncontrolled switching behaviour
of the device which may result in a heavy noise on the GND and V

lines in case of an fault condition (e.g. short

to GND or V

Overvoltage and Undervoltage Detection

If the power supply voltage V

rises above the overvoltage threshold V

SOV OFF

(max. 22V), the outputs OUT1

to OUT6 are switched to high impedance state to protect the load. If the supply voltage recovers to normal op-
erating voltage, the device will return to the programmed state (lockout bit 14 = 0). When the voltage V

drops

below the undervoltage threshold V

SUV OFF

(min. 6V), the output stages are switched to high impedance to

avoid the operation of the power devices without sufficient gate driving voltage (increased power dissipation). If
the supply voltage V

and the internal charge-pump recovers to normal operating voltage the system returns to

the programmed state (lockout bit 14 = 0). If the lockout bit 14 is set, the automatic turn-on of the drivers is de-
activated. The microcontroller needs to clear the status bits to reactivate the drivers.

DESCRIPTION (continued)

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L9949

Temperature Warning and Thermal Shutdown

When the junction temperature rises above T

j TW

a temperature warning flag is set and is available via the SPI.

If the junction temperature increases above the second threshold T

j SD

, the thermal shutdown bit will be set and

the power DMOS transistors of the output stages are switched off to protect the device. In order to reactivate
the output stages the junction temperature must decrease below T

j SD

- T

j SD HYS

and the thermal shutdown bit

has to be cleared by the microcontroller.

Open Load Detection

The open load detection monitors the voltage drop of current sense resistors in each highside and lowside driver
of the output stage. The output signal of an open load comparator has to be valid for at least 0.5 ms (t

dOL

) to

set the open load bit (bit 1-11) in the status register 1.

Over Load Detection

In the case of an overcurrent condition an overcurrent flag (bit 1-11) is set in the status register 0 in the same
way as open load detection. If the overcurrent signal is valid for at least t

ISC

= 10µs, the overcurrent flag is set

and the corresponding driver is switched off to reduce the power dissipation and to protect the integrated circuit.
The microcontroller has to clear the status bits to reactivate the corresponding driver.

Current monitor

The current monitor output sources a current image at the current monitor output which has a fixed ratio (1/
10000) of the instantaneous current of the selected highside driver. The bits 12 and 13 of the Input Data register
controls which of the outputs OUT1, OUT2 and OUT6 will be multiplexed to the current monitor output. The cur-
rent monitor output allows a more precise analyse of the actual state of the load rather than the detection of an
open- or overload condition. For example this can be used to detect the motor state (free-running, loaded or
blocked) or the temperature of the heating element.

Figure 1. Pin Connection (Top view)

GND

OUT1

CLK

OUT5

OUT4

OUT3

OUT6

VCC

CSN

OUT2

GND

D99AT455Amod

L9949

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PIN FUNCTION

N°

Pin

Description

1, 10,

11, 20

GND

Ground:
Reference potential

Important:

For the capability of driving the full current at the outputs all pins of GND must be

externally connected !

5, 8, 13,

Power supply voltage (battery):
For this input a ceramic capacitor as close as possible to GND is recommended.

Important:

For the capability of driving the full current at the outputs all pins of V

must be

externally connected !

Logic supply voltage:
For this input a ceramic capacitors as close as possible to GND are recommended.

CSN

Chip Select Not input:
This input is low active and requires CMOS logic levels. The serial data transfer between L9949
and micro controller is enabled by pulling the input CSN to low level. If an input voltage of more
than 9.6V above VCC is applied to CSN pin the L9949 will be switched into a test mode.

CLK

Serial clock input:
This input controls the internal shift register of the SPI and requires CMOS logic levels.

Data In

Serial data input:
The input requires CMOS logic levels and receives serial data from the microcontroller. The data
is an 16bit control word and the least significant bit (LSB, bit 0) is transferred first.

Data Out Serial data output:

The diagnosis data is available via the SPI and this tristate-output. The output will remain in
tristate, if the chip is not selected by the input CSN (CSN = high)

Current monitor output:
Depending on the multiplexer bits 12 and 13 of the Input Data register this output sources an
image of the instant current through the corresponding highside driver with a ratio of 1/10000

OUT1

Halfbridge-output 1:
The output is built by a highside and a lowside switch, which are internally connected. The
output stage of both switches is a power DMOS transistor. Each driver has an internal parasitic
reverse diode (bulk-drain-diode, highside driver from OUT1 to V

, lowside driver from GND to

OUT1). This output is overcurrent and open load protected.

OUT2

Halfbridge-output 2:

see OUT1 (pin 9)

OUT3

Halfbridge-output 3:
The output is built by a highside and a lowside switch, which are internally connected. The
output stage of both switches is a power DMOS transistor. Each driver has an internal parasitic
reverse diode (bulk-drain-diode, highside driver from OUT3 to VS, lowside driver from GND to
OUT3). This output is overcurrent and open load protected.

OUT4

Halfbridge-output 4:

see OUT3 (pin 2)

OUT5

Halfbridge-output 5:

see OUT3 (pin 2)

OUT6

Highside-driver-output 6:
The output is built by a highside switch and can be used only for a resistive load, because the
internal reverse diode from GND to OUT6 is missing. This highside switch is a power DMOS
transistor with an internal parasitic reverse diode from OUT6 to V

(bulk-drain-diode). The output

is overcurrent and open load protected.

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L9949

ABSOLUTE MAXIMUM RATINGS

Note: All maximum ratings are absolute ratings. Leaving the limitation of anyone of these values may cause an irreversible damage of the

integrated circuit!

ESD PROTECTION

THERMAL DATA

Temperature warning and thermal shutdown:

Symbol

Parameter

Value

Unit

DC supply voltage

-0.3...28

single pulse t

max

< 400 ms

stabilized supply voltage, logic supply

-0.3 to 6

CLK

CSN

digital input / output voltage

-0.3 to V

+ 0.3

current monitor output

-0.3 to V

+ 0.3

OUT1,OUT2,

OUT6

output current

±10

OUT3,OUT5

output current

±5

Parameter

Value

All pins

±2

(1)

HBM according to MIL 883C, Methode 3015.7 or EIA/JESD22-A114-A

output pins: OUT1 OUT6

±4

(2)

HBM with all unzapped pins grounded

Symbol

Parameter

Value

Unit

Operating junction temperature:

Operating Junction Temperature

-40 to 150

°C

Symbol

Parameter

Min.

Typ.

Max.

Unit

jTW ON

Temperature Warning Threshold
Junction Temperature

increasing

150

°C

jTW OFF

Temperature Warning Threshold
Junction Temperature

decreasing

120

°C

jTW HYS

Temperature Warning Hysteresis

jSD ON

Thermal Shutdown Threshold
Junction Temperature

increasing

180

°C

jSD OFF

Thermal Shutdown Threshold
Junction Temperature

decreasing

150

°C

jSD HYS

Thermal Shutdown Hysteresis

Part Number L9949