4 Hardware
UM0178
12/37
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Programmable independent current trip points for each satellite channel
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Support Manchester protocol for satellite sensors
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Supports for variable bit rate detection
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Independent current limit and fault timer shutdown protection for each satellite output
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Short to ground and short to battery detection and reporting for each satellite channel
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5.5MHz SPI interface
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Satellite message error detection
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Hall effect sensor support on satellite channels 3 and 4.
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Low voltage internal reset
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2kV ESD capability on all pins
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Package: 64LD TQFP
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Technology: ST Proprietary BCD5 (0.65µm)
4.3
L9654 quad squib driver and dual sensor interface ASIC
L9654 is intended to deploy up to 4 squibs and to interface up to 2 satellites. Squib drivers are
sized to deploy 1.2A minimum for 2ms minimum during load dump and 1.75A 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.
The main features set are described below:
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4 deployment drivers sized to deliver 1.2A (min.) for 2ms (min.) and 1.75A(min) for
1ms(min).
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Independently controlled high-side and low-side MOS for diagnosis
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Analog output available for resistance
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Squib short to ground, short to battery and MOS diagnostic available on SPI register
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Capability to deploy the squib with 1.2A (min.) or 1.75A under 40V load-dump condition
and the low side MOS is shorted to ground
●
Capability to deploy the squib with 1.2A (min.) at 6.9V V
RES
and 1.75A at 12V V
RES.
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Interface with 2 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
●
5.5MHz SPI interface
●
Satellite message error detection
●
Low voltage internal reset
●
2kV ESD capability on all pins
●
Package: 48LD TQFP
●
Technology: ST Proprietary BCD5 (0.65µm)
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