L9658 datasheet(38/64 Pages) STMICROELECTRONICS

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Functional description

L9658

38/64

Doc ID 14219 Rev 3

4.11.5

Example of short between loops diagnostic

The following SPI frame sequence is an example how to detect a short between channel 0

and the other channels. The symbol % designates the bit to be tested. This bit is cleared to

a 0 when there is a short between the selected channels. Bits D13 (Short to battery) and D3

(Over current on Squib) are relevant too. Both of them must be at 0 for no fault. It may

happens that after leakage test on channel Y, channel Y is shorted to battery, so when X is

biased and Y monitored for shorts between channels, D7=D3=0 while D13=1. This will

highlight a short to battery.

Enable the diagnostic current; select IBIAS current; set the IBIAS/ISRC multiplexer to

channel 0; set the AOUT/Comparators multiplexer to channel 1. The MISO read will

depend on the previous MOSI message.

Set the AOUT/Comparators multiplexer to channel 2. The MISO read will be the results

of the channel 0 to channel 1 test.

Set the AOUT/Comparators multiplexer to channel 3. The MISO read will be the results

of the channel 0 to channel 2 test.

Set the AOUT/Comparators multiplexer to channel 4. The MISO read will be the results

of the channel 0 to channel 3 test.

Set the AOUT/Comparators multiplexer to channel 5. The MISO read will be the results

of the channel 0 to channel 4 test.

D15 D14 D13 D12 D11 D10

MISO

000

MOSI

XXX

D15 D14 D13 D12 D11 D10

MISO

001

000

MOSI

000

D15 D14 D13 D12 D11 D10

MISO

001

000

MOSI

000

D15 D14 D13 D12 D11 D10

MISO

010

000

MOSI

000

D15 D14 D13 D12 D11 D10

MISO

010

000

MOSI

000

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