STPMIC25 datasheet(42/145 Pages) STMICROELECTRONICS

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5.2.4

POWER_DOWN:

Once a turn-OFF condition occurs, the PMIC asserts RSTn then the PMIC shuts down RANK0 regulators that

have been started by software (BUCK6 in the Figure 11 example).

Then the PMIC disables the regulators sequentially in reverse rank order from the POWER_UP sequence, by 1.5

ms slots.

For example (see Figure 11):

RANK5 (LDO4) then RANK4 (BUCK1) then RANK3 (BUCK2) then RANK2 (BUCK4) then RANK1 (LDO1).

When the RANK1 ends, the PMIC goes into the OFF state (RSTn is kept asserted).

The analog behavior of regulators is detailed in Section 4

5.3

Digital pin description

5.3.1

PONKEYn

The PONKEYn signal is intended to be connected to a push-button at the application level. If the push-button is

pressed by a user, the PONKEYn signal is grounded. If the push-button is released by the user, the PONKEYn

signal is floating, but the internal PMIC RPU ties PONKEYn to VIN.

Main characteristics:

•

Digital input

•

Active low

•

Programmable pull-up (RPU) internally connected to VIN; RPU active by default

•

Debounce filter on rising and falling edges (see Figure 12)

•

Turn-ON condition on falling edge (after debounce) when PMIC is in the OFF state

•

Turn-ON condition on low level from a PMIC POR (see Section 5.4.3)

•

Interrupt on falling and rising edges (after debounce)

•

Turn-OFF condition on PONKEYn long press (duration programmable)

Figure 12. PONKEYn debounce filter behavior

PONKEYn falling edge: the debounce filter timer is enabled once the PONKEYn voltage is lower than VIL. If a

bounce voltage higher than VIH occurs, the debounce filter timer is canceled and so on.

PONKEYn rising edge: the debounce filter timer is enabled once the PONKEYn voltage is higher than VIH. If a

bounce voltage lower than VIL occurs, the debounce filter timer is canceled and so on.

STPMIC25

Feature descriptions

DS14278 - Rev 3

page 42/145

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