STPMIC1CPQR datasheet(54/140 Pages) STMICROELECTRONICS

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Active turn-ON condition before VIN rises above VIN_POR_Rise sequence is presented in Figure 58. Turn-on

condition before VIN_POR_Rise .

Figure 58. Turn-on condition before VIN_POR_Rise

t1: VIN rises above VIN_POR_RISE while a turn-ON condition is detected active. The STPMIC1 performs the

PRELOAD_NVM and swiches to OFF-state.

t2: the STPMIC1 starts debounce as soon as it is entered OFF-state.

t3: turn-ON condition is confirmed after debounce time. Switch to CHECK&LOAD then POWER_UP as VIN >

VINOK_Rise.

t3 to t4: turn-ON conditions are ignored from CHECK&LOAD to POWER_ON.

t4: turn-ON condition is ignored and does not affect usual STPMIC1 behavior in POWER_ON. (Except PONKEY

long key press. See Section 5.4.3 Turn-OFF conditions and restart_request)

Active turn-ON signal does not prevent from POWER_DOWN.

t5: active turn-OFF condition event occurs from a valid source. Switch to POWER_DOWN.

t5 to t6: Active turn-ON during POWER_DOWN is ignored.

t7: New turn-ON signal rising edge has been detected after debounce time. Valid turn-ON condition detected. The

STPMIC1 switches to POWER_UP.

5.4.3

Turn-OFF conditions and restart_request

Turn-OFF conditions are events or stimulus leading the STPMIC1 to go to OFF-state from a POWER_ON state,

by switching through a POWER_DOWN sequence.

The STPMIC1 is turned OFF by six conditions presented in Table 12. Turn-off conditions.

Some turn-OFF conditions support restart_request option that allows the STPMIC1 to perform a power cycle back

to POWER_ON instead of going to off-state (POWER_DOWN/CHECK&LOAD/POWER_UP) without waiting for a

valid turn-ON condition restarts.

Turn-OFF condition with restart_request option has a similar behavior as a reset power cycle except that

mask_reset option is ignored. Refer to Section 5.4.4 Reset and mask_reset option

restart_request option can be enabled by setting RREQ_EN bit in Table 25. MAIN_CR register, prior to turn-OFF

condition occurrence.

Table 12. Turn-off conditions

Name

Conditions

Power cycle if

RREQ_EN=1

Software switch-

OFF

Writing 1 to SWOFF bit in Table 25. MAIN_CR register

YES

PONKEYn long

key press

PKEYLKP bit set in Table 31. PKEY_TURNOFF_CR

YES

STPMIC1

Feature description

DS12792 - Rev 7

page 54/140

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