L9301 datasheet(34/54 Pages) STMICROELECTRONICS

34 / 54 page

Low side driver

L9301

34/54

DS11400 Rev 9

9.4

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, DRN1 with DRN2, and DRN3 with DRN4. For

each couple, only one driver off diagnosis is enabled (OUT1, OUT3, DRN1, DRN3) 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.

The correct effect of the diagnosis can be guaranteed only if the drivers are correctly

parallelized externally.

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.

OUT1-8

VOUTOPEN_LS

Open load output

voltage

Open load

condition

2,3

2.5

2,7

VTGND_LS

Output short-circuit

to GND voltage

threshold

1.9

2.3

IOUT_PD_LS

Output diagnostic

pull- down current @

OFF STATE

OUTx = 5 V

100

µA

IOUT_PU_LS

Output diagnostic

pull-up current @

OFF STATE

OUTx=1.5 V

100

µA

Minimum OFF time

for correct diagnostic

(Blank time 0)

Application note

(ESD cap < 12

nF, Bit_blank = 0)

980

µs

Minimum OFF time

for correct diagnostic

(Blank time 1)

Application note

(ESD cap < 6 nF,

Bit_blank = 1)

530

µs

Table 24. Electrical characteristics related to diagnosis (continued)

Symbol

Parameter

Test condition

Min.

Typ.

Max.

Unit

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