Datasheet > NCA9555B

NCA9555B

更新时间： 2024-04-09 18:58:52

品牌	Logo	应用领域
纳芯微 - NOVOSENSE		开关电源开关风扇传感器
页数	文件大小	规格书
28页	1246K
描述
NCA9555B是一款24引脚CMOS器件，提供16位通用并行I2C总线数输入/输出GPIO扩展功能。它和ACPI电源开关，传感器，按键，LED和风扇等应用的额外I/O口需求提供了简单的解决方案。

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NCA9555B 数据手册

NCA9555B

16-bit I2C-bus I/O port

with interrupt

Datasheet (EN) 1.1



Address by three hardware address pins for use of up to

eight devices

Latched outputs with high-current drive capability for

directly driving LEDs

Latch-up performance exceeds 100 mA per JESD 78,

class II

ESD protection exceeds JESD 22: 2000 V HBM and 1000 V

CDM

Product Overview

The NCA9555B is a 24-pin device that provides 16 bits of

General Purpose parallel Input/Output (GPIO) expansion

for the two-line bidirectional I2C bus applications. The

device can operate with a power supply voltage (VDD)

range from 1.65 V to 5.5 V. It provides a simple solution

when additional I/Os are needed for ACPI power switches,

sensors, push buttons, LEDs, fans, etc.

The NCA9555B consists of two 8-bit Configuration (Input

or Output selection); Input, Output and Polarity

Inversion (active HIGH or active LOW operation) registers.

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 read register can be inverted with the Polarity

Inversion register. All registers can be read by the system

master.

Applications



GPIO expansion for I2C-bus applications

Servers, personal computers, personal electronics

Routers (Telecom Switching Equipment)

Products with GPIO-Limited processors

Device Information

Part Number

Package

Body Size

NCA9555B-DTSXR

TSSOP24

7.80mm*4.40mm

NCA9555B-DQNXR QFN24

4.00mm*4.00mm

The NCA9555B open-drain interrupt output is activated

when any input state differs from its corresponding input

port register state and is used to indicate to the system

master that an input state has changed. The power-on

reset sets the registers to their default values and

initializes the device state machine.

Pinout

Three hardware pins (A0, A1, A2) vary the fixed I2C-bus

address and allow up to eight devices to share the same

I2C-bus.

Key Features

Figure 1. NCA9555B-DTSXR Pinout



I2C to Parallel Port Expander

Operating power supply voltage range of 1.65 V to 5.5 V

Low standby current

Open-drain active-low interrupt output

5.5 V tolerant, 16 I/O ports which default to input mode

Compatible with most microcontrollers

Up to 400 kHz clock frequency

Noise filter on SCL/SDA inputs

Polarity Inversion register

Internal power-on reset

No glitch on power-up

Figure 2. NCA9555B- DQNXR Pinout

Page 1

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