General description

The PCA9539A is a low-voltage 16-bit General Purpose Input/Output (GPIO) expander with interrupt and reset for I2C-bus/SMBus applications. NXP I/O expanders provide a simple solution when additional I/Os are needed while keeping interconnections to a minimum, for example, in ACPI power switches, sensors, push buttons, LEDs, fan control, etc.

Features and benefits

■ I2C-bus to parallel port expander

■ Pin and function compatible with PCA9539

■ Operating power supply voltage range of 1.65 V to 5.5 V

■ Low standby current consumption:

?? 1.5 ?A (typical at 5 V VDD)

?? 1.0 ?A (typical at 3.3 V VDD)

■ Schmitt-trigger action allows slow input transition and better switching noise immunity at the SCL and SDA inputs

?? Vhys = 0.10 ? VDD (typical)

■ 5 V tolerant I/Os

■ Active LOW reset input (RESET)

■ Open-drain active LOW interrupt output (INT)

■ 400 kHz Fast-mode I2C-bus

■ Internal power-on reset

■ Power-up with all channels configured as inputs

■ No glitch on power-up

■ Latched outputs with 25 mA drive maximum capability for directly driving LEDs

■ Latch-up performance exceeds 100 mA per JESD78, Class II

■ ESD protection exceeds JESD22

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

?? 1000 V Charged-Device Model (C101)

■ Packages offered: TSSOP24, HWQFN24

PCA9539APW屬于集成電路（IC） > I/O 擴(kuò)展器。恩智浦半導(dǎo)體公司制造生產(chǎn)的PCA9539APWI/O 擴(kuò)展器該系列器件可與微控制器、微處理器或類似器件結(jié)合使用，目的是增加可用于連接外設(shè)的信號(hào)連接數(shù)量。典型的工作概念涉及使用串行通信，只需主機(jī)設(shè)備上的幾根 I/O 線，即可讀/寫(xiě)擴(kuò)展器設(shè)備上的許多輸入/輸出引腳的狀態(tài)。該技術(shù)的通信速度不佳，但連通性較高，最適合快速響應(yīng)不是很關(guān)鍵的應(yīng)用，例如許多人機(jī)界面應(yīng)用。