L9663 datasheet(41/104 Pages) STMICROELECTRONICS

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L9663

Satellite interface

103

Master Mode



Short to battery test

–

Enable PSI1 channel

–

Wait for a 512 μs time in order to reach steady state condition (short to ground

and overcurrent masked in this phase)

–

Check psi1_stb='0': in case psi1_stb='1' the fault flag is asserted and the channel

1 is not involved in the following tests

–

Switch off PSI1 channel and switch on IXCT pull down current for a 128 μs time on

PSI1 interface

–

Once PSI5 line is supposed to be discharged (128 μs time elapsed), pull-down

current is switched OFF

–

Enable PSI2 channel

–

Repeat the above flow for PSI2 channel



X coupling test phase 1 (only if channel 1 was not excluded in previous short to battery

test)

–

Enable PSI1 channel, PSI2 channel switched off

–

Wait for 512 μs time in order to reach steady state condition and allow PSI under

voltage filter time to elapse (short to ground and overcurrent masked in this phase)

–

Check psi1_uv='0' and psi2_uv='1': in case of psi1_uv='1' a short to GND on PSI1

is detected while in case psi2_uv='0' a cross coupling is detected and XCT2_R bit

is set (h)

–

Switch off PSI1 channel and switch on IXCT pull down current for a 128 μs time

–

Once PSI5 line is supposed to be discharged (128 μs time elapsed), pull-down

current is switched off.



X coupling test phase 2 (only if channel 2 was not excluded in previous short to battery

test)

–

Enable PSI2 channel, PSI1 channel switched off

–

Wait for 512us time in order to reach steady state condition and allow PSI under

voltage filter time to expire (short to ground and overcurrent masked in this phase)

–

Check psi2_uv='0' and psi1_uv='1': in case of psi2_uv='1' a short to GND on PSI2

is detected while in case psi1_uv='0' a cross coupling is detected and XCT1_R bit

is set

–

Switch off PSI2 channel and switch on IXCT pull down current for a 128 μs time

–

Once PSI5 line is supposed to be discharged (128 μs time elapsed), pull-down

current is switched off

Short to battery test in master mode is executed in two phases for the two channels to avoid

enabling simultaneously PSIx interfaces and avoid overloading ECU supply line.

Cross coupling test in master mode stops automatically when the time required by this test

is elapsed. Cross coupling test in slave mode can be stopped with "Abort cross coupling

test" command; only in this case, the flag "cross-coupling test aborted" is not set, because

this is not a faulty condition.

h. Cross coupling test flags swapped in master mode, see errata n.1830, Section 7: Errata.

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