ADP5588ACPZ-R7 datasheet(11/28 Pages) AD

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Data Sheet

ADP5588

Rev. D | Page 11 of 28

START

MASK TIMER = 0

KEY PRESS

DETECTED

YES

GENERATE

KE INTERRUPT

START MASK TIMER

MASK TIMER

EXPIRES

MASK TIMER

EXPIRES

GENERATE

KEYLOCK INTERRUPT

FIRST UNLOCK

KEY DETECTED

SECOND UNLOCK

KEY DETECTED

START UNLOCK1 TO UNLOCK2

UNLOCK1 TO

UNLOCK2

TIMER EXPIRES

KEY PRESS

DETECTED

START UNLOCK1 TO UNLOCK2

FIRST UNLOCK

KEY DETECTED

GENERATE

KEYLOCK INTERRUPT

SECOND UNLOCK

KEY DETECTED

UNLOCK1 TO

UNLOCK2

TIMER EXPIRES

Figure 10. Keypad Lock Interrupt Mask Timer Flowchart

Debouncing

The ADP5588 has a 50 μs debounce time for GPIOs configured

as GPIs and rows in keypad scanning mode. The reset line

always has a 50 μs debounce time.

General Purpose Outputs (GPOs)

The ADP5588 allows the user to configure all or some of its

GPIOs as GPOs. These GPOs can be used as extra enables for

the host processor or simply as trigger outputs. When configured

as an output (GPO), a digital buffer drives the pin to 0 V for a 0

and to VCC for a 1. To set any GPIO as a GPO, make sure that

the corresponding bits in Register 0x1D through Register 0x1F are

set for GPIO mode; then use Register 0x23 through Register 0x25

to set the corresponding bits for GPO mode.

Power-On Reset

For built-in power-up initialization for applications lacking a

power-on reset signal, a reset pin, RST, allows the user to reset

the registers to default values in the event of a brownout or

other reset conditions.

Ambient Light Sensing

The ADP5588 has built in light sensor comparator inputs to

detect ambient light conditions. An ADC samples the output of

external photosensors connected to the comparator inputs, and

the result is fed into programmable trip comparators. The ADC

has an input range of 0 μA to 1000 μA (typical). The device can

handle up to two photosensors (use Register 0x30 through

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