L9788 datasheet(57/264 Pages) STMICROELECTRONICS

57 / 264 page

DS12308 Rev 4

57/264

L9788

Main relay driver (low-side driver)

263

The battery status can be determined at power up only.

The key detection switches on always MRD and does not determine the battery status.

Once the key detection has switched on MRD, MRD is switched off by one of these

events:

–

Clearing of all detections and phold not active (power down),

–

Watchdog power counter timeout,

–

MSC MRD OFF command when phold is active (all detections cleared).

The msc_enable_driver command or trans_f error or clock monitor error does not affect

the MRD even if it is controlled by MSC commands.

5.1

ON state diagnostic

Table 25. ON state diagnostic

MRD

MSC

command

OVC

OVT

ON OFF

KEY_DET=1

Permanent Supply

restart by MSC

scenario 19

(see Figure 109)

Auto restart without

limit of number

scenario 21

(see Figure 111)

Non

Permanent

Supply

Before

Power up

N/A N/A

Auto restart without

limit of number

scenario 12/13

(see Figure 102)

N/A

After

Power up

Auto restart without

limit of number

scenario 14/27/15

(see Figure 102, 104

and 105)

Auto restart without

limit of number

scenario 26/27

(see Figure 100 and

Figure 104)

WAKE_IN_DET /

WAKE_EOT_DET /

WAKE_CAN_DET =1

KEY_DET=0

Permanent Supply

OFF

restart by MSC

scenario 19

(see Figure 109)

Auto restart without

limit of number

scenario 21

(see Figure 111)

Non

Permanent

Supply

Before

Power up

N/A N/A

Auto restart for

MRD_EN_TIMEOUT

min 331 ms

typ 500 ms

max 650 ms

Scenario 17/18

(see Figure 102 and

107)

N/A

After

Power up

No restart

scenario 31

(see Figure 108)

No restart

scenario 28

(see Figure 115)

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