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L9659 датащи(PDF) 27 Page - STMicroelectronics

номер детали L9659
подробное описание детали  Octal squib driver ASIC for safety application
PDF  51 Pages
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производитель  STMICROELECTRONICS [STMicroelectronics]
домашняя страница  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L9659 датащи(HTML) 27 Page - STMicroelectronics

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L9659
Functional description
Doc ID 022048 Rev 2
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3.4.4
Squib diagnostics
Overview
The ASIC is able to perform the following diagnostics
●
Short to battery and ground on both SQHx and SQLx pins with or without a squib
●
Loop to loop diagnostics
●
Squib resistance measurement
●
Squib High resistance
●
High side safing FET diagnostics
●
VRESx voltage status
●
High and low side FET diagnostics
Below is a block diagram showing the components involved in the squib diagnostics.
Figure 9.
Squib diagnostics block diagram
Short to battery/ground and loop to loop diagnostics
The leakage diagnostic includes a short to battery, a short to ground and a short between
loop tests. The test will be run for each SQHx and SQLx pin so that shorts can be detected
regardless of the resistance between the squib pins.
Normal short to battery/ground diagnostics.
For the test the internal VRCM is switched on and connected to the selected pin (SQHx or
SQLx) pin. The IPD bit will be selected to be OFF which will deactivate the pulldown current



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