L9662 STMicroelectronics

L9662 Octal squib driver and quad Manchester/PSI5 encoded sensor interface ASIC for safety application Datasheet - production data 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 LQFP64 (10x10x1.4mm) shutdown protection for each satellite output Short to ground and short to battery detection Features and reporting for each satellite channel 8 deployment drivers with SPI selectable firing 2 independent SPI interfaces current and times 5.5 MHz SPI interface Capability to deploy the squib with 1.2 A Satellite message error detection (min)/2 ms, 1.75 A (min)/1.0 ms and 1.75 A Hall effect sensor support on satellite channels (min)/0.65 ms between VRES of 7 V to 37 V 3 and 4. Capability to deploy the squib with 1.5 A Low voltage internal reset (min)/2 ms between VRES of 7 V to 25 V 2 kV ESD capability on all pins Firing capability to deploy all channels simultaneously Package: LQFP64 Independently controlled high-side and low- Technology: ST Proprietary BCD5 side MOS for diagnosis Analog output available for resistance Description measurement The device is intended to deploy up to 8 squibs Squib short to ground, short to battery and and to interface up to 4 satellites. 2 satellite MOS diagnostic available on SPI register interfaces can be used to interface Hall sensors. Capability to deploy the squib the low side Squib drivers are sized to deploy 1.2 A minimum MOS is shorted to ground for 2 ms, 1.75 A minimum for 1 ms and 1.75 A minimum for 0.65 ms during load dump along with 4 Fire enable inputs 1.5 A minimum for 2 ms for VRES voltages less Interface with 4 satellite sensors than 25 V. Programmable independent current trip points Full diagnostic capabilities of the squib interface for each satellite channel are provided. Satellite interfaces support Support Manchester 1 or 2 protocol for satellite Manchester 1, 2 and PSI5 decoding with variable sensors bit rate. Table 1. Device summary Order code Amb. temp range, C Package Packing L9662 Tray -40 to +85 LQFP64 L9662TR Tape & Reel September 2015 DocID028325 Rev 1 1/80 This is information on a product in full production. www.st.com 0 03 Contents L9662 Contents 1 Block diagram and pin description . 7 1.1 Block diagram . 7 1.2 Pin description 8 2 Electrical specifications . 10 2.1 Absolute maximum ratings 10 2.2 Absolute maximum degraded operating ratings 11 2.3 Operating ratings . 12 2.4 Electrical characteristics 12 2.4.1 General . 12 2.4.2 Electrical characteristics - Squib deployment drivers and diagnostics 14 2.4.3 Electrical characteristics - Satellite interface . 19 2.4.4 SPI timing . 24 3 Functional description 26 3.1 Overview . 26 3.2 General functions . 26 3.2.1 Power on reset (POR) 26 3.2.2 RESETB 26 3.2.3 Reference resistor . 27 3.2.4 Loss of ground 27 3.2.5 VRESx capacitance 27 3.2.6 Supply voltages . 27 3.2.7 Ground connections 27 3.3 Serial peripheral interface (SPI) 28 3.3.1 SPI pin descriptions 28 3.4 Squib drivers 29 3.4.1 Firing . 29 3.4.2 Firing current measurement 33 3.4.3 Fire enable (FEN) function description . 33 3.4.4 Squib diagnostics 34 3.4.5 SPI register definition for squib functions . 39 3.4.6 Satellite sensor interface 55 2/80 DocID028325 Rev 1