TPIC71002-Q1

SLIS139

– MARCH 2011

www.ti.com

DESCRIPTION

The TPIC71002 is a two-channel squib driver for airbag deployment in automotive applications. Each channel

consists of a high side and a low side switches with independent control logic for protection against inadvertent

deployment. Both the high and the low side switches have internal current limits and over-temperature protection.

The IC registers are used for two channel configuration, control and status monitoring. To prevent inadvertent

deployment, the high and the low side switches are turned on only if the proper configuration sequence is used,

two independent arming/safing inputs are active and multiple inputs to the deploy controller logic are at the

correct level. The registers are programmed using a serial communication interface.

To prevent excessive power dissipation the maximum active ON time for each channel is limited by

programmable Firing Time Out Timer. In addition, a current limit register is used to program the maximum current

through the switches during a deployment. The current limitation on the low side switch is larger than the

corresponding high side switch. During deployment, the low side switch will be fully enhanced and operates in

IC diagnostic functions monitor deployment pin voltages to facilitate high-side switch test, low-side switch test,

squib resistance measurements, squib leakage measurement to battery or ground or leakage between any squib

channels. The squib leakage measurement does not require the squib load to be present and covers both Zx and

ZMx pins. Diagnostic information is communicated through the AMX_OUT pin (for analog signals) and SPI

mapped status registers (for status signals latched in digital core).

The high-side and low-side squib drivers have a diagnostic level current limit and a deployment level current limit.

The default current limit for high-side and low-side squib drivers is the diagnostic level current limit. The high-side

switch deployment current limit for all high-side drivers can be set to either 1.2 A min or 1.75 A min (see Table 1)

through SPI mapped registers and device EEPROM settings (see Table 2). The low-side switch deployment

current limit is not programmable and is fixed to a level greater than the high-side driver current limit. The ON

time duration for each individual squib driver can be programmed through SPI mapped registers.

The deployment sequence requires a specific set of software commands combined with external hardware

arming/safing logic inputs (TZ=H, IWD=L) to provide deployment capability. The turn-on sequence of the

high-side and low-side drivers is software controlled via SPI commands. The turn-off procedure is automatically

controlled by the deployment ASIC for the high side drivers, while the low side drivers turn-off procedure can be

controlled by the deployment ASIC or by software via SPI commands. After the programmed ON time

deployment has been achieved, the high-side driver is deactivated first. It is followed by the low-side driver

deactivation after approximately 100usec (in case of hardware control turn-off sequence device configuration), or

after SPI command for low side driver turn-off has been received from an external microcontroller (in case of

software control turn-off sequence device configuration).

The RESET_N is an active low input reset signal. This input is driven high (by the power supply unit and/or the

external

µC) once the external voltage supplies are within the specified limits. The external microcontroller is

required to configure and control device through the serial communication interface. Reliable software is critical

for the system operation.

Table 1. Potential Deployment Settings for Typical Firing Current

MAXIMUM AVERAGE FIRING

FIRING

TYPICAL FIRING

DWELL (FIRING)

VOLTAGE BETWEEN VZX AND ZX

VOLTAGE

CURRENT

TIME

PINS TO ACHIEVE DEPLOYMENT

35 V

32.56 V

1.2 A

35 V

35.0 V

1.75 A

(1)

For programming desired dwell (firing) time

Extended deployment duration activates the over-temperature protection circuit and terminates deployment. If

short-to-ground condition occurs during deployment, 35-V firing voltage is completely dropped across the

HS_FET, thereby thermal shut down protection kicks in to protect the device.

2

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Copyright

© 2011, Texas Instruments Incorporated

Product Folder Link(s): TPIC71002-Q1