L9788 datasheet(118/264 Pages) STMICROELECTRONICS

118 / 264 page

High/low-side drivers - STARTER STR[1:3]

L9788

118/264

DS12308 Rev 4

8.5

Delay-off function

The Delay-off function involves the RLY4 and STR[2:3] drivers when they are configured as

starters by the bit MSC_CONFIG_REG3[0]=RLY4_DELAY_OFF_EN=1,

CONFIG_REG3[4]=STR2_EN=1, CONFIG_REG3[5]=STR3_EN=1. These drivers follow

the reset matrix as other drivers when they are not configured as starters.

If the drivers are configured as starter and it is in on state its delay-off timer starts when one

of the following events occurs:



under-voltage of the main supply VDD5 is detected,



over-voltage of the main supply VDD5 is detected,



the MSC time out occurs,



an active signal ("0") at pin WDA(IN),



an active signal ("0") at pin RSTN(IN)

During the delay off time THOLD



The driver is ON regardless of whether the ON/OFF command is reset.



The starter configuration is held.



The HSD/LSD configuration bit is held.



The driver is ON even in case of Watchdog ERR_CNT>4 and ERR_CNT>7



The driver is ON even in case of VDDIO_UV.



Once it has started, the delay_off is not restarted by a new triggering event before

THOLD has expired.

The delay-off timer can be terminated by one of the following events:



THOLD time expires.



Driver is switched off by MSC command off.

After DELAY_OFF time the RLY4, STR[2:3] take the status of the on/off data command. If

before the delay off time expires, the above triggering sources are recovered, the delay-off

function remains valid.

Thermal

shutdown

analog filter time

Guaranteed by design

1.5

µs

STR1/2/3

t_SD_deglitch

Digital deglitch

filter time on

Temperature

shut down

detection

Guaranteed by scan

µs

STR1/2/3

Fast OFF

diagnostic

ON->OFF->ON

Filter Mode=0

220

245

270

µs

STR1/2/3

Fast ON

diagnostic

OFF->ON->OFF

µs

STR1/2/3

Table 50. High/low-side driver - STARTER electrical characteristics (continued)

Symbol

Parameter

Test condition

Min

Typ

Max

Unit

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