L99PM62GXP datasheet(27/102 Pages) STMICROELECTRONICS

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L99PM62GXP

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Doc ID 17639 Rev 4

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2.5.2

Multiple failures – entering forced VBAT standby mode

If the fail-safe condition persists and all attempts to return to normal system operation fail,

the L99PM62 enters the forced VBAT standby mode in order to prevent damage to the

system. The forced VBAT standby mode can be terminated by any regular wake-up event.

The root cause of the forced VBAT standby is indicated in the SPI status registers

The forced VBAT standby mode is entered in case of:

●

Multiple watchdog failures: forced sleep WD = 1 (15x watchdog failure)

●

Multiple thermal shutdown 2: forced sleep TSD2/SHTV1 = 1 (7 x TSD2)

●

V1 short at turn-on: forced sleep TSD2/SHTV1 = 1 (V1 < V1fail for t > tV1fail)

Figure 16.

Example: exit fail safe mode from watchdog failure

Table 6.

Persisting fail safe conditions and exit modes

Failure source

Failure condition

Diagnosis

Exit from fail-safe mode

µC (oscillator)

15 consecutive

watchdog failures

Fail-safe = 1

ForcedSleepWD = 1

Wake-up

TRIG = 1 during LOWi

read & clear SR3

short at turn-on

Fail-safe = 1

ForcedSleepTSD2/SHTV1 = 1

Read&clear SR3 after wake-up

Temperature

7 times TSD2

Fail-safe = 1

TW = 1

TSD1 = 1

TSD2 = 1

ForcedSleepTSD2/SHTV1 = 1

Read&clear SR3 after wake-up

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