MEN BL51E, User Manual

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Functional Description
20BL51E00 E2

2020-03-27 Page 45
Setting a Shut-Down Delay
The shut-down delay can be set using a watchdog signal. If the ignition signal is disabled
and the ignition watchdog is running, it is possible to reset the ignition watchdog timer
by software using the WDOG_EN signal to avoid a power shutdown.
If the ignition watchdog is running and the timer is not restarted, the BL51E is forced into
power down mode after approximately 5 minutes.
Figure 9. Ignition and shut-down delay watchdog state diagram

See Table 59, SMB Register (
0x40) on page 57

See Table 64, SMB Register (
0x4E) on page 60
.
Power:OFF
IGNITION:OFF
Power:ON
WDOG:OFF
IGNITION:ON
IGNITION:ON
Powerbutton:EVENT
WDOG:ON
Power:ON
IGNITION:OFF
PS_ON:OFF
WDOG:TIMEOUT
WDOG:RESET