L9654 STMicroelectronics

L9654 Quad squib driver and dual sensor interface ASIC for safety application Datasheet - production data Support Manchester protocol for satellite sensors Supports for variable bit rate detection Independent current limit and fault timer shutdown protection for each satellite output * 3*36 Short to ground and short to battery detection LQFP48 and reporting for each satellite channel 5.5 MHz SPI interface Satellite message error detection Features Low voltage internal reset 4 deployment drivers sized to deliver 1.2 A 2 kV ESD capability on all pins (min) for 2 ms (min) and 1.75 A (min) for Package: 48 lead LQFP 1ms (min). Technology: ST Proprietary BCD5s (0.57 m) Independently controlled high-side and low- side MOS for diagnosis Description Analog output available for resistance Squib short to ground, short to battery and L9654 is intended to deploy up to 4 squibs and to MOS diagnostic available on SPI register interface up to 2 satellites. Capability to deploy the squib with 1.2 A (min.) Squib drivers are sized to deploy 1.2 A (min.) for or 1.75 A under 35 V load-dump condition and 2 ms (min.) during load dump and 1.75 A (min.) the low-side MOS is shorted to ground for 1 ms (min.) during load dump. Capability to deploy the squib with 1.2 A (min.) Diagnostic of squib driver and squib resistance at 6.9 V V and 1.75 A at 12 V V . RES RES measurement is controlled by micro controllers. Interface with 2 satellite sensors Satellite interfaces support Manchester decoder Programmable independent current trip points with variable bit rates. for each satellite channel Table 1. Device summary Order code Package Packing L9654 LQFP48 Tray L9654TR LQFP48 Tape and reel November 2013 DocID14218 Rev 3 1/59 This is information on a product in full production. www.st.comContents L9654 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 . 26 4.10.3 Short to battery . 27 2/59 DocID14218 Rev 3