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Texas Instruments TPIC71008 Eight Channel Squib Driver

Texas Instruments TPIC71008 Eight-Channel Squib Driver is for airbags deployment in automotive applications. Each channel consists of a high side and low side switch with independent control logic for protection against an accidental deployment. Both the high and the low side switches have an internal current limit and over-temperature protection. The IC registers are used for eight-channel configuration, control, and status monitoring. The high and the low side switches of the Texas Instruments TPIC71008 are turned on only if the proper configuration sequence is used to prevent accidental deployment. Two independent arming/saving inputs are active, and multiple inputs to the deployed controller logic are at the correct level. The registers are programmed using a serial communications interface.

Features

  • Eight-channel squib drivers for airbag
  • Loop diagnostics monitor and reporting
  • Two logic inputs providing independent logic for enabling/disabling deployment
  • Eight independent thermally protected High Side drivers that can source deployment or diagnostic current level to each squib load
  • Eight independent avalanche voltage and thermally protected Low Side drivers that can sink deployment or diagnostic current level from each squib load
  • Each output capable of 1.2A/1.75A firing current for typical 2ms/0.5ms
  • SPI Slave Interface for serial bus communication with parity check
  • Firing VZx voltage range 10V to 35V, transients up to 40V
  • Programmable firing time up to 8.2ms
  • Common Load current settings for all deployment loops, using registers
  • Individual firing current timer limit set for each deployment loop, using registers
  • Firing current timer to monitor firing current over deployment time for each deployment loop
  • Independent switch control for both high and low side switches
  • Diagnostic mode for fault checking
  • Internal fault monitoring for safe operation
  • A multiplexable output buffer for analog voltage measurements
  • Use of external clamping devices on squib pins is not required to protect the deployment ASIC against substrate injection effects during deployment due to dynamic shorts to ground
  • An external pin connection to the microprocessor ADC supply for ratio-metric squib resistance measurement
  • 40V pin capability on all pins (except GNDx, AGND, DGND, VCC5, VDDIO, AMX_OUT)
  • -40°C to 105°C operating ambient temperature range
  • Thermally enhanced 48-pin TSSOP DCA application

Applications

  • Squib drivers for airbag application

Functional Block Diagram

Block Diagram - Texas Instruments TPIC71008 Eight Channel Squib Driver
Published: 2016-08-23 | Updated: 2022-03-11