L9301 datasheet(33/51 Pages) STMICROELECTRONICS

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L9301

Combined diagnosis (configuration 1, 2 & 3)

In configuration 1, there are four couples of drivers in parallel to get four channels with lower

RdsON: OUT1 with OUT2, OUT3 with OUT4, HS1 with HS2, and HS3 with HS4. For each

couple, only one driver off diagnosis is enabled (OUT1, OUT3, HS1, HS3) while the off

diagnosis results are stored in both drivers registers. The other diagnosis of the two drivers

in parallel, as over-current, over-temperature and DLOSS, are both enabled.

In configuration 2 the off diagnosis is enabled for OUT1-4 only. Considering that the

diagnosis blanking time can be longer than the off time of PWM, the diagnosis results can

be affected. The short to GND fault can be detected by the HS OC fault when it is switched

on. The Open Load Fault can be detected when PWM is disabled (PWM disable SPI bit = 1)

only because in such a condition both HS and LS are OFF. In this condition the OUTx is

pulled down by LS off diagnosis pull down current (typical 70 μA) and it's necessary to wait

the time needed to discharge OUTx to get Open Load (OL) detection. The time to be

considered starts from the PWM disable bit writing.

In configuration 3 the off diagnosis is enabled for HS1-4 only. Considering that the diagnosis

blanking time can be longer than the off time of PWM, the diagnosis results can be affected.

The short to VB fault can be detected by the OC fault when it is switched on. The Open

Load Fault can be detected when PWM is disabled (PWM disable SPI bit = 1) only because

in such a condition both HS and LS are OFF. In this condition the OUTx is pulled up by HS

off diagnosis pull up current (typical 75 μA) and it's necessary to wait the time needed to

discharge OUTx to get Open Load (OL) detection. The time to be considered starts from the

PWM disable bit writing.

In PWM mode, configuration 2 and 3, unless the PWM enable SPI bit for OUT1-4 and

DRN/SRC1-4 are set, the eight drivers are all switched off.

Table 22. Configuration 2

Parameter

Test condition

Min.

Typ.

Max.

Unit

Minimum OFF time for

correct diagnostic (Blank

time 0)

Application note NOT TESTED

(ESD cap < 12 nF, Bit_blank = 0)

4140

μs

Minimum OFF time for

correct diagnostic (Blank

time 1)

Application note NOT TESTED

(ESD cap < 6 nF, Bit_blank=1)

2190

μs

Table 23. Configuration 3

Parameter

Test condition

Min.

Typ.

Max.

Unit

Minimum OFF time for

correct diagnostic (Blank

time 0)

Application note NOT TESTED

(ESD cap < 12 nF, Bit_blank = 0)

980

μs

Minimum OFF time for

correct diagnostic (Blank

time 1)

Application note NOT TESTED

(ESD cap < 6 nF, Bit_blank=1)

530

μs

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