TPS6521825_V01 datasheet(43/109 Pages) TI1

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<100 ms

AC_DET pin

(input)

10 ms

100 ms

AC_DET

deglitched

(internal signal)

Power-up event

(internal signal)

(C)

AC_DET

System Power

(5.5 V)

(B)

AC_DET

(A)

AC_DET

System Power

(5.5 V)

100 k

TPS6521825

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SLDS260 – NOVEMBER 2019

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Detailed Description

5.3.1.15.1 Signaling PB-Low Event on the nWAKEUP Pin

In ACTIVE state, the nWAKEUP pin is pulled low for five 32-kHz clock cycles (approximately 150 µs)

whenever a falling edge on the PB input is detected. This allows the host processor to wakeup from DEEP

SLEEP mode of operation. It is recommended to pull-up the nWAKEUP pin to DCDC6 output through a 1-

MΩ resistor.

5.3.1.15.2 Push Button Reset

If the PB input is pulled low for 8 s (15 s if TRST = 1b) or longer, then all rails except for DCDC5 and

DCDC6 are disabled, and the device enters the RECOVERY state. The device powers up automatically

after the 500 ms power-down sequence is complete, regardless of the state of the PB input. Holding the

PB pin low for 8 s (15 s if TRST = 1b), only turns off the device temporarily and forces a system restart,

and is not a power-down function. If the PB is held low continuously, the device power-cycles in 8-s and

15-s intervals.

5.3.1.16 AC_DET Input (AC_DET)

The AC_DET pin is a CMOS-type input used in three different ways to control the power-up of the PMIC:

•

In a battery operated system, AC_DET is typically connected to an external battery charger with an

open-drain power-good output pulled low when a valid charger supply is connected to the system. A

falling edge on the AC_DET pin causes the PMIC to power up.

•

In a non-portable system, the AC_DET pin may be shorted to ground and the device powers up

whenever system power is applied to the chip.

•

If none of the above behaviors are desired, AC_DET may be tied to system power (IN_BIAS). Power-

up is then controlled through the push-button input or PWR_EN input.

Portable Systems

Non-portable Systems

Disabled

Figure 5-27. AC_DET Pin Configurations

Figure 5-28. AC_DET Input Deglitch and Power-Up Timing (Portable Systems)

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