STPMIC1APQR datasheet(51/140 Pages) STMICROELECTRONICS

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The example above shows POWER_UP and POWER_DOWN procedure from digital point of view (ENA bit of

each regulators); but not their respective output voltage (analog).

Regarding to analog behavior of each regulator, please refer to Section 4 Power regulators and switch

description.

5.4

Feature description

5.4.1

VIN conditions and monitoring

Main input supply named VIN is monitored permanently by the STPMIC1 state machine. There are different

threshold triggers on VIN. The lowest to the highest thresholds are: POR_VIN, VINOK, VINLOW as presented in

the Figure 55. VIN monitoring thresholds.

Figure 55. VIN monitoring thresholds

(NVM

)

200mv

VINOK_HYST(NVM)

VINLOW_TRESH

VINLOW_HYST

VINLOW_FA Interrupt

VINLOW_RI Interrupt

VIN

VINOK_Rise

VIN_POR_Rise

VIN_POR_Fall

VINLOW_Rise

VINLOW_Fall

VINOK_Fall

POR_VIN

POR_VIN is the minimum voltage required to supply the STPMIC1 internal circuitry. It is specified by two

hardcoded thresholds with 200 mv hysteresis:

•

Below VIN_POR_Fall STPMIC1 is considered as not supplied

•

Above VIN_POR_Rise STPMIC1 internal circuitry is functional

Refer to Section 3.4 Electrical and timing parameters for threshold value.

VIN_OK

VIN_OK is the minimal voltage required to allow the STPMIC1 to work in POWER_ON state.

It is specified by VINOK_Rise threshold and VINOK_HYST hysteresis values that can be adjusted in NVM,

respectively by VINOK_TRESH[1:0] and VINOK_HYS[1:0] bits in Table 65. NVM_MAIN_CTRL_SHR.

•

If VIN falls below VINOK_Fall (VINOK_Fall = VINOK_Rise – VINOK_HYST) then it is considered as a turn-OFF

condition and the STPMIC1 immediately starts POWER_DOWN sequence. Refer to Section 5.4.3 Turn-

OFF conditions and restart_request.

•

If VIN rises above VINOK_Rise then the STPMIC1 is allowed to go to POWER_ON state after a turn-ON

condition has occurred. Refer to Section 5.4.2 Turn-ON conditions

VINLOW

VINLOW is an optional and configurable software threshold that can be setup to notify the application processor

through interrupt, that a power shutdown, due to VIN going low, is a possible risk.

VINLOW can be enabled and configured by programming register Section 6.3.6 PWR_SWOUT and VIN control

VINLOW rising and falling thresholds are defined by a logical signal point of view. VINLOW signal goes to ‘1’

(rising edge) when VIN decreases VINLOW_Rise threshold. VINLOW falling edge occurs when VIN goes above

VINLOW_Fall threshold.

STPMIC1

Feature description

DS12792 - Rev 7

page 51/140

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