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PD557

更新时间： 2024-11-25 06:02:23

品牌	Logo	应用领域
德州仪器 - TI		/
页数	文件大小	规格书
36页	1174K
描述
REMOTE 8-BIT I2C AND SMBus LOW-POWER I/O EXPANDER WITH RESET AND CONFIGURATION REGISTERS

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PD557 数据手册

PCA9557

www.ti.com.................................................................................................................................................... SCPS133I–DECEMBER 2005–REVISED JUNE 2008

REMOTE 8-BIT I²C AND SMBus LOW-POWER I/O EXPANDER

WITH RESET AND CONFIGURATION REGISTERS

FEATURES

•

Low Standby Current Consumption of

1 µA Max

I²C to Parallel Port Expander

•

Internal Power-On Reset

High-Impedance Open Drain on P0

•

Power Up With All Channels Configured as

Inputs

Operating Power-Supply Voltage Range of

2.3 V to 5.5 V

•

No Glitch on Power Up

•

5-V Tolerant I/O Ports

400-kHz Fast I²C Bus

Noise Filter on SCL/SDA Inputs

Latched Outputs With High Current Drive

Maximum Capability for Directly Driving LEDs

Three Hardware Address Pins Allow for Use of

up to Eight Devices on I²C/SMBus

•

Latch-Up Performance Exceeds 100 mA Per

JESD 78, Class II

•

Lower-Voltage Higher-Performance Migration

Path for PCA9556

ESD Protection Exceeds JESD 22

•

Input/Output Configuration Register

Polarity Inversion Register

Active-Low Reset Input

–

2000-V Human-Body Model (A114-A)

200-V Machine Model (A115-A)

1000-V Charged-Device Model (C101)

RGV PACKAGE

(TOP VIEW)

RGY PACKAGE

(TOP VIEW)

D, DB, DGV, OR PW PACKAGE

(TOP VIEW)

V_CC

SCL

SDA

16 15 14 13

SDA

RESET

GND

DESCRIPTION/ORDERING INFORMATION

This 8-bit I/O expander for the two-line bidirectional bus (I²C) is designed for 2.3-V to 5.5-V V_CCoperation. The

device provides general-purpose remote I/O expansion for most microcontroller families via the I²C interface

[serial clock (SCL) and serial data (SDA)].

The PCA9557 consists of one 8-bit configuration (input or output selection), input port, output port, and polarity

inversion (active-high) registers. At power on, the I/Os are configured as inputs. However, the system master can

enable the I/Os as either inputs or outputs by writing to the I/O configuration bits. The data for each input or

output is kept in the corresponding input or output register. The polarity of the input port register can be inverted

with the polarity inversion register. All registers can be read by the system master.

The device outputs (latched) have high-current drive capability for directly driving LEDs. The device has low

current consumption.

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas

Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.

12 3 4 5 6 7...36

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