ADP5588ACPZ-R7 datasheet(24/28 Pages) AD

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ADP5588

Data Sheet

Rev. D | Page 24 of 28

APPLICATIONS INFORMATION

CONTROL

REGISTERS

HOST

PROCESSOR

CONTROL

INTERFACE

REF

VOLTAGE

ENABLE 2 (GPO)

BACKLIGHT

ENABLE (GPO)

SCL

SDA

VCC

GND

VCC

SCL

GPL1

GPL2

SDA

RST

INT

REF

VOLTAGE

0.1µF

VCC

BACKLIGHT

DRIVER

PWM OUTPUT

ADP5588

VCC

RST

INT

Figure 17. ADP5588 Detailed Application Block Diagram

APPLICATIONS OVERVIEW

The ADP5588 is designed to complement host processors in a

variety of ways. Its versatility makes it the ideal solution for

mobile platforms that require extended keypads and GPIO

expanders. The programmable registers give the designer the

flexibility to configure any or all its GPIOs in a variety of ways.

Figure 17 shows a detailed application diagram.

KEYPAD CURRENT

Keypad current drain varies based on how many keys and how

many rows and columns are pressed during multiple key presses.

Table 52 shows typical current drain for a single press and for

two key presses.

Table 52. Typical Current Drain

Key Presses

Conditions1

Typical

Unit

VCC = 1.8 V to 3.0 V

μA

VCC = 1.8 V to 3.0 V

100

μA

1 TA = TJ = −40°C to +85°C.

BACKLIGHT CONTROL APPLICATION

Although the ADP5588 is not designed with a backlight driver,

the built-in light sensor comparator inputs, with programmable

registers and trip points, give the backlight designer all the

necessary tools to control the backlight based on lighting con-

ditions or environment. With a few I2C commands, the designer

can program the device to monitor lighting conditions and

trigger an interrupt based on preset trip points. Once program-

med, the state machine uses these trip points and hysteresis

values to alert the microprocessor of any change in lighting

conditions. In addition to the L2_OUT and L3_OUT bits, four

additional registers (Register 0x3B through Register 0x3E, two

registers per light sensor) provide detailed accounts of the

internal ADC due to light condition changes. The ADC has a

full-scale current of 1000 μA and a dynamic range of 8000,

which translates to 0.125 μA or 0.3125 lux per step. These two

corresponding registers per sensor form a 13-bit register that

can be read to provide detailed translation of the light sensor

input at any instant.

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