Datasheet > ADP5587

ADP5587

更新时间： 2024-11-06 06:36:23

品牌	Logo	应用领域
亚德诺 - ADI		控制器
页数	文件大小	规格书
24页	326K
描述
Mobile I/O Expander and QWERTY Keypad Controller

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ADP5587 数据手册

Mobile I/O Expander and

QWERTY Keypad Controller

ADP5587

FEATURES

FUNCTIONAL BLOCK DIAGRAM

18-GPIO port expander or 10 × 8 keypad matrix

GPIOs configurable as GPIs, GPOs, and keypad rows or

columns

ADP5587

GND

I²C interface with auto-increment

1.7 V to 3.6 V operation

SCL

SDA

RST

INT

Keypad lock capability

Open-drain interrupt output

Key press and key release interrupts

GPI interrupt with level programmability

Programmable pull-ups

CONTROL

REGISTERS

CONTROL

INTERFACE

Key event counter with overflow interrupt

275 μs debounce on the reset line and GPIs

1 μA typical idle current

10 11 12 13 14 15 16

Figure 1.

55 μA typical polling current

Small 4 mm × 4 mm LFCSP package

APPLICATIONS

Keypad and I/O expander designed for QWERTY type phones

that require a large keypad matrix

GENERAL DESCRIPTION

The ADP5587 has keypad lock capability with an option to

trigger or not trigger an interrupt at key presses and releases.

All communication to the main processor is done using one

interrupt line and two I²C-compatible interface lines. The

ADP5587 can be configured as a keypad matrix of up to 8 rows ×

10 columns (a maximum of 80 keys).

The ADP5587 is an I/O port expander and keypad matrix

designed for QWERTY type phones that require a large keypad

matrix and expanded I/O lines. I/O expander ICs are used in

mobile platforms as a solution to the limited number of GPIOs

available in the main processor.

In its small 4 mm × 4 mm package, the ADP5587 contains

enough power to handle all key-scanning and decoding and

to flag the processor of key presses and releases via the I²C

interface and interrupt. The ADP5587 frees the main micro-

processor from the need to monitor the keypad, thereby

minimizing current drain and increasing processor bandwidth.

The ADP5587 is also equipped with a buffer/FIFO and key

event counter to handle and keep track of up to 10 unprocessed

key or GPI events with overflow wrap and interrupt capability.

When the ADP5587 is used for smaller keypad matrices, unused

row and column pins can be reconfigured to act as general-

purpose inputs or outputs. R0 to R7 denote the row pins of the

matrix, whereas C0 to C9 denote the column pins. At power-up,

all rows and columns default to GPIs and must be programmed

to function as part of the keypad matrix or as GPOs.

Rev. 0

Information furnished by Analog Devices is believed to be accurate and reliable. However, no

responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other

rightsof third parties that may result fromits use. Specifications subject to change without notice. No

license is granted by implication or otherwise under any patent or patent rights of Analog Devices.

Trademarks andregisteredtrademarks are the property of their respective owners.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 781.329.4700

Fax: 781.461.3113

www.analog.com

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与ADP5587相关器件

型号	品牌	获取价格	描述	数据表
ADP5587_1	ADI	获取价格	Mobile I/O Expander and QWERTY Keypad Controller
ADP5587ACBZ-R7	ADI	获取价格	Mobile I/O Expander and QWERTY Keypad Controller
ADP5587ACPZ-1-R7	ADI	获取价格	Mobile I/O Expander and QWERTY Keypad Controller
ADP5587ACPZ-R7	ADI	获取价格	Mobile I/O Expander and QWERTY Keypad Controller
ADP5588	ADI	获取价格	Keypad I/O Expander
ADP5588ACPZ-R7	ADI	获取价格	Keypad I/O Expander
ADP5589ACBZ-00-R7	ADI	获取价格	Keypad Decoder and I/O Expansion
ADP5589ACBZ-01-R7	ADI	获取价格	Keypad Decoder and I/O Expansion
ADP5589ACBZ-02-R7	ADI	获取价格	Keypad Decoder and I/O Expansion
ADP5589ACPZ-00-R7	ADI	获取价格	Keypad Decoder and I/O Expansion

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