L9301 datasheet(35/54 Pages) STMICROELECTRONICS

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DS11400 Rev 9

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L9301

Low side driver

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 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 25. 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 26. 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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