33797 Datasheet, PDF (31/34 Pages) Freescale Semiconductor, Inc – Four Channel Squib Driver IC

FUNCTIONAL DEVICE OPERATION
PROTECTION AND DIAGNOSIS FEATURES
When either a $82 or a $83 command is issued, the
previous transistor test will stop to prevent coinciding high-
and low-side FET drive transistors from turning “ON”. This
prevents high- and low-side drivers from being activated
simultaneously.
Note The high- or low-side squib driver test is capable of
checking a code sequence, allowing any combination of high-
or low-side drivers to be tested.
The diagnostic squib driver bit (HSDSTAT_X or
LSDSTAT_X) will be set to “1” if the squib driver did not
activate (turn “ON”) during the diagnostic test. The diagnostic
squib driver bit (HSDSTAT_X or LSDSTAT_X) will be set to
“0” if the squib driver did activate (turn “ON”) during the
diagnostic test. Diagnostic data will be shifted from the shift
register during the next read/write operation.
The diagnostic squib driver register will be set / cleared to
“0” when the unlock command is loaded ($82 or $83 loaded
with rising edge of CS).
A diagnostic bit set to “0” indicates standard squib driver
transistor operation.
Analog Integrated Circuit Device Data
Freescale Semiconductor
33797
31