L9660 datasheet(40/49 Pages) STMICROELECTRONICS

40 / 49 page

Functional description

L9660

40/49

DocID024714 Rev 2

SQP bit: Squib Pin to be tested during short to

battery/ground diagnostics

0 = SQBLx pin test

1 = SQBHx pin test

Bits D4

Used to disable IPD on all channels

0 = IPD active as indicated;

– Active for all channels except the one under test when

running Short to Battery/Ground and short between

loops

Diagnostics and LS/HS FET test

– Active for all channels when running Stop Diagnostic,

Resistance Diagnostics, High Squib Resistance

Diagnostics, HSS Diagnostic and VRESx Diagnostics

1 = IPD disabled on all channels

Bits D3

AMC Bit

Bit used for resistance measurement amplifier calibration.

Only valid when squib resistance diagnostics is selected,

otherwise this is ignored and a 0 is reported in the

response

0 = No calibration (Normal squib resistance measurements)

1 = Calibration

For bits D2:D0

The following table shall be used for channel selection.

All other combinations for MOSI bits D2:D0 produce an error response of 0xD000.

Note:

Except for short to battery /ground diagnostics and loop to loop test the state of IPD (D4)

does not affect the test.

Table 25. Channel selection

Channel

Bit D2

Bit D1

Bit D0

L9660 Datasheet(PDF) 40 Page - STMicroelectronics