L9658 Datasheet, PDF (1/64 Pages) STMicroelectronics – Analog output available for resistance

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
■ Analog output available for resistance
■ Squib short to ground, short to battery and
MOS diagnostic available on SPI register
■ Capability to deploy the squib with 1.2 A (min)
or 1.75 A under 35 V load-dump condition and
the low side MOS is shorted to ground
■ Capability to deploy the squib with 1.2 A (min)
at 6.9 V VRES and 1.75 A at 12 V VRES
■ Interface with 4 satellite sensors
■ Programmable independent current trip points
for each satellite channel
■ Support Manchester protocol for satellite
sensors
■ Supports for variable bit rate detection
■ Independent current limit and fault timer
shutdown protection for each satellite output
■ Short to ground and short to battery detection
and reporting for each satellite channel
■ 5.5 MHz SPI interface
■ Satellite message error detection
LQFP64
■ Hall effect sensor support on satellite channels
3 and 4.
■ Low voltage internal reset
■ 2 kV ESD capability on all pins
■ Package: 64 leads LQFP
■ Technology: ST proprietary BCD5s (0.57 µm)
Description
L9658 is intended to deploy up to 8 squibs and to
interface up to 4 satellites. 2 satellite interfaces
can be used to interface Hall sensors.
Squib drivers are sized to deploy 1.2 A minimum
for 2 ms minimum during load dump and 1.75 A
minimum for 1ms minimum during load dump.
Diagnostic of squib driver and squib resistance
measurement is controlled by micro controller.
Satellite interfaces support Manchester decoder
with variable bit rate.
Table 1.
Device summary
Order code
L9658
L9658TR
Package
LQFP64
LQFP64
Packing
Tray
Tape and reel
September 2013
Doc ID 14219 Rev 3
1/64
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