L9659TR STMicroelectronics

L9659 Octal squib driver ASIC for safety application 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 0 03 Capability to deploy the squib with 1.5 A (min)/2 ms between VRES of 7 V to 25 V LQFP64 (10x10x1.4mm) Firing capability to deploy all channels simultaneously Independently controlled high-side and low- Technology: ST proprietary BCD5 (0.65 m) side MOS for diagnosis RoHS compliant Analog output available for resistance measurement Squib short to ground, short to battery and Description MOS diagnostic available on SPI register The L9659 is intended to deploy up to 8 squibs. 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 4 fire enable inputs minimum for 0.65 ms during load dump along with 1.5 A minimum for 2 ms for VRES voltages less 5.5 MHz SPI interface than 25 V. Low voltage internal reset Full diagnostic capabilities of the squib interface 2 kV ESD capability on all pins are provided. Package: LQFP64 Table 1. Device summary Order code Amb. temp range, CPackage Packing L9659 -40 to +95 LQFP64 Tray L9659TR -40 to +95 LQFP64 Tape and reel September 2013 Doc ID 022048 Rev 2 1/51 www.st.com 1Contents L9659 Contents 1 Block diagram and pin description . 5 1.1 Block diagram . 5 1.2 Pin description 5 1.3 Application schematic . 8 2 Electrical specifications 9 2.1 Absolute maximum ratings . 9 2.2 Absolute maximum degraded operating ratings 10 2.3 Operating ratings . 10 2.4 Electrical characteristics 11 2.4.1 General . 11 2.4.2 Electrical characteristics - Squib deployment drivers and diagnostics 12 2.4.3 SPI timing . 17 3 Functional description 19 3.1 Overview . 19 3.2 General functions . 19 3.2.1 Power on reset (POR) 19 3.2.2 RESETB 19 3.2.3 Reference resistor . 20 3.2.4 Loss of ground 20 3.2.5 VRESx capacitance 20 3.2.6 Supply voltages . 20 3.2.7 Ground connections 20 3.3 Serial peripheral interface (SPI) 21 3.3.1 SPI pin descriptions 21 3.4 Squib drivers 22 3.4.1 Firing . 22 3.4.2 Firing current measurement 25 3.4.3 Fire enable (FEN) function description . 26 3.4.4 Squib diagnostics 27 3.4.5 SPI register definition for squib functions 31 4 Package information 49 5 Revision history . 50 2/51 Doc ID 022048 Rev 2