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L9679ETR Datasheet(PDF) 10 Page - STMicroelectronics

Part # L9679ETR
Description  Automotive battery cut-off circuit and airbag system expansion IC
PDF  127 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L9679ETR Datasheet(HTML) 10 Page - STMicroelectronics

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4.1
Deployment drivers
•
8 high-side deployment drivers, 8 low-side deployment drivers
•
User-programmable deployment options
–
1.20 A or 1.75 A minimum
–
Programmable time in 64us increments
•
Capability to deploy a squib/pyroswitch with a minimum current of 1.2 / 1.75 A and the low-side FET
shorted to ground up to 25 V on SSxy
•
Independently controlled high-side and low-side FETs
•
Squib/Pyroswitch resistance measurement
•
Firing current monitor feature
•
High- and low-side FET tests
•
Open and shorts diagnostics, including between loop drivers
•
Independent fire enable logic, SPI and discrete digital input
4.2
Remote sensor interfaces
•
Four-channel receiver
–
standard PSI-5 v1.3 compatible with asynchronous and synchronous protocols
•
Current limit with shortcircuit protection diagnostics
•
PSI-5 satellite sensor mode
–
Auto-adjusting current trip points for each satellite channel
–
Even parity, 8- or 10-bit messages, 125 k or 189 kbps
–
Satellite message error detection
4.3
Arming logic
•
Three discrete and independent input arming signals
4.4
Other features
•
One dedicated 32-bit SPI bus for global configuration and control
•
One dedicated 32-bit SPI bus for remote sensor configuration and control
•
Temperature sensor
•
Independent thermal shutdown protection on the remote sensor interfaces
•
All diagnostics are digital and are available through SPI communications
•
Configurable digital I/O pin voltage range, 5 V or 3.3 V
L9679E
Overview and block diagram
DS12485 - Rev 8
page 10/127



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