L9660 STMicroelectronics

L9660 Quad squib driver ASIC for safety application Datasheet - production data 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 when the low side MOS is shorted to ground 2 fire enable inputs LQFP64 (10x10x1.4mm) 5.5 MHz SPI interface Low voltage internal reset 2 kV ESD capability on all pins Package: LQFP64 Features Technology: ST proprietary BCD5 (0.65m) RoHS compliant 4 deployment drivers with SPI selectable firing current and times Description Capability to deploy the squib with 1.2 A (min)/2 ms, 1.75 A (min)/1.0 ms and 1.75 A The L9660 is intended to deploy up to 4 squibs. (min)/0.65 ms between VRES of 7 V to 37 V Squib drivers are sized to deploy 1.2 A minimum Capability to deploy the squib with 1.5 A for 2 ms, 1.75 A minimum for 1 ms and 1.75 A (min)/2 ms between VRES of 7 V to 25 V minimum for 0.65 ms during load dump along with 1.5 A minimum for 2 ms for VRES voltages less Firing capability to deploy all channels than 25 V. simultaneously Independently controlled high-side and low- Full diagnostic capabilities of the squib interface side MOS for diagnosis are provided. Table 1. Device summary Order code Amb. temp range, C Package Packing L9660 -40 to +95 LQFP64 Tray L9660TR -40 to +95 LQFP64 Tape and reel September 2013 DocID024714 Rev 2 1/49 This is information on a product in full production. www.st.com 0 03 Contents L9660 Contents 1 Block diagram and pin description . 5 1.1 Block diagram . 5 1.2 Pin description 5 1.3 Application schematic . 7 2 Electrical specifications 8 2.1 Absolute maximum ratings . 8 2.2 Absolute maximum degraded operating ratings . 9 2.3 Operating ratings 9 2.4 Electrical characteristics 10 2.4.1 General . 10 2.4.2 Electrical characteristics - Squib deployment drivers and diagnostics . 11 2.4.3 SPI timing . 16 3 Functional description 18 3.1 Overview . 18 3.2 General functions . 18 3.2.1 Power on reset (POR) 18 3.2.2 RESETB 18 3.2.3 Reference resistor . 19 3.2.4 Loss of ground 19 3.2.5 VRESx capacitance 19 3.2.6 Supply voltages . 19 3.2.7 Ground connections 19 3.3 Serial peripheral interface (SPI) 20 3.3.1 SPI pin descriptions 20 3.4 Squib drivers 21 3.4.1 Firing . 21 3.4.2 Firing current measurement 24 3.4.3 Fire enable (FEN) function description . 25 3.4.4 Squib diagnostics 25 3.4.5 SPI register definition for squib functions . 30 4 Package information 47 5 Revision history . 48 2/49 DocID024714 Rev 2