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L9662：Octal squib driver and quad Manchester/PSI5 encoded sensor interface ASIC for safety application

The device is intended to deploy up to 8 squibs and to interface up to 4 satellites. 2 satellite interfaces can be used to interface Hall sensors. Squib drivers are sized to deploy 1.2 A minimum for 2 ms, 1.75 A minimum for 1 ms and 1.75 A minimum for 0.65 ms during load dump along with 1.5 A minimum for 2 ms for VRES voltages less than 25 V.

Full diagnostic capabilities of the squib interface are provided. Satellite interfaces support Manchester 1, 2 and PSI5 decoding with variable bit rate.

Key Features

• 8 deployment drivers with SPI selectable firing current and times
• Capability to deploy the squib with 1.2 A (min)/2 ms, 1.75 A (min)/1.0 ms and 1.75 A (min)/0.65 ms between VRES of 7 V to 37 V
• Capability to deploy the squib with 1.5 A (min)/2 ms between VRES of 7 V to 25 V
• Firing capability to deploy all channels simultaneously
• Independently controlled high-side and low-side MOS for diagnosis
• Analog output available for resistance measurement
• Squib short to ground, short to battery and MOS diagnostic available on SPI register
• Capability to deploy the squib the low side MOS is shorted to ground
• 4 Fire enable inputs
• Interface with 4 satellite sensors
• Programmable independent current trip points for each satellite channel
• Support Manchester 1 or 2 protocol for satellite sensors
• Support PSI5 (Parity) protocol for satellite sensors (reference PSI5 technical specification V 1.2 /14.06.07)
• Support for Sync pulse and minibus for satellites
• Supports for variable bit rate detection
• Independent current limit and fault timer shutdown protection for each satellite output
• Short to ground and short to battery detection and reporting for each satellite channel
• 2 independent SPI interfaces
• 5.5 MHz SPI interface
• Satellite message error detection
• Hall effect sensor support on satellite channels 3 and 4.
• Low voltage internal reset
• 2 kV ESD capability on all pins
• Package: LQFP64
• Technology: ST Proprietary BCD5

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