L9788 datasheet(129/264 Pages) STMICROELECTRONICS

129 / 264 page

DS12308 Rev 4

129/264

L9788

Pre-drivers - IGNITER IGN[1:6]

263

10.2

Short to GND

When IGNx pin voltage is lower than Vth_STG_IGN for a filter time at pre-driver is enabled

high, short to ground fault is detected. So the fault is latched until Read_Diag_CMD action.

Figure 52. IGN pre-drivers diagnosis timing diagram at short to GND

Table 55. Pre-driver - IGNITER diagnosis

Controlled load

Diagnosis & protection type

Detected faults @ pre-

driver enabled HIGH

Detected faults @ pre-

driver enabled LOW

Internal IGBT/smart IGBT

(IGN_DIAG

(CONFIG_REG2 D5) = ‘0’)

The controlled device is

module internal. No diagnosis

and protection required

External IGBT Load

(IGN_DIAG = ‘1’)

IGNx voltage and current

monitoring

_ IGNx short to GND

_ IGNx open load

_ IGNx short to VBAT

GADG0512161558PS

IGNx_CMD

NO Fault

SHORT-TO-GROUND fault

SHORT-TO-GROUND fault happened

Filter time for IGN

Enabled HIGH

Enabled LOW

Read_Diag_CMD

Diag_fault

V_Pin_IGNx

Vth_STG_IGN

Driver status

IGNx_stg

L9788 Datasheet(PDF) 129 Page - STMicroelectronics

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