L9658TR STMicroelectronics

L9658 Octal squib driver and quad sensor interface ASIC for safety application Features 8 deployment drivers sized to deliver 1.2 A (min) for 2 ms (min) and 1.75 A (min) for 1 ms (min) Independently controlled high-side and low- side MOS for diagnosis LQFP64 Analog output available for resistance Squib short to ground, short to battery and Hall effect sensor support on satellite channels MOS diagnostic available on SPI register 3 and 4. Capability to deploy the squib with 1.2 A (min) Low voltage internal reset or 1.75 A under 35 V load-dump condition and 2 kV ESD capability on all pins the low side MOS is shorted to ground Package: 64 leads LQFP Capability to deploy the squib with 1.2 A (min) Technology: ST proprietary BCD5s (0.57 m) at 6.9 V VRES and 1.75 A at 12 V VRES Interface with 4 satellite sensors Description Programmable independent current trip points for each satellite channel L9658 is intended to deploy up to 8 squibs and to Support Manchester protocol for satellite interface up to 4 satellites. 2 satellite interfaces sensors can be used to interface Hall sensors. Supports for variable bit rate detection Squib drivers are sized to deploy 1.2 A minimum for 2 ms minimum during load dump and 1.75 A Independent current limit and fault timer minimum for 1ms minimum during load dump. shutdown protection for each satellite output Short to ground and short to battery detection Diagnostic of squib driver and squib resistance and reporting for each satellite channel measurement is controlled by micro controller. 5.5 MHz SPI interface Satellite interfaces support Manchester decoder with variable bit rate. Satellite message error detection Table 1. Device summary Order code Package Packing L9658 LQFP64 Tray L9658TR LQFP64 Tape and reel September 2013 Doc ID 14219 Rev 3 1/64 www.st.com 1Contents L9658 Contents 1 Block diagram and application schematic . 7 1.1 Block diagram . 7 1.2 Application schematic . 7 2 Pin description . 8 2.1 Thermal data . 9 3 Electrical specification 10 3.1 Maximum ratings . 10 3.2 Absolute maximum ratings 10 3.3 Electrical characteristics 11 3.3.1 DC characteristics . 11 3.3.2 AC characteristics . 14 4 Functional description 18 4.1 Overview . 18 4.2 Power on reset (POR) . 18 4.3 RESETB 18 4.4 MSG . 18 4.5 IREF . 19 4.6 Loss of ground . 19 4.7 Deployment and reset . 19 4.8 Serial peripheral interface (SPI) 19 4.8.1 Chip select (CS A, CS D, CS S) . 21 4.8.2 Serial clock (SCLK, SCLK A) 21 4.8.3 Serial data output (MISO, MISO A) 21 4.8.4 Serial data input (MOSI, MOSI A) . 22 4.9 Deployment drivers . 22 4.9.1 Arming interface . 23 4.10 DEPEN . 25 4.10.1 Deployment driver diagnostic . 26 4.10.2 Continuity diagnostic . 27 4.10.3 Short to battery . 27 2/64 Doc ID 14219 Rev 3