description

The PCA9505/PCA9506 provide 40-bit parallel input/output (I/O) port expansion for I2C-bus applications organized in 5 banks of 8 I/Os. At 5 V supply voltage, the outputs are capable of sourcing 10 mA and sinking 15 mA with a total package load of 600 mA to allow direct driving of 40 LEDs. Any of the 40 I/O ports can be configured as an input or output. Output ports are totem-pole and their logic state changes at the Acknowledge (bank change). The PCA9505 is identical to the PCA9506 except that it includes 100 k? internal pull-up resistors on all the I/Os. The PCA9506 does not include the internal pull-ups on the I/Os to reduce power consumption when used as outputs or when the input is driven by a push-pull driver.

Features

■ Standard mode (100 kHz) and Fast mode (400 kHz) compatible I2C-bus serialinterface

■ 2.3 V to 5.5 V operation with 5.5 V tolerant I/Os

■ 40 configurable I/O pins that default to inputs at power-up

■ PCA9505 includes 100 k? internal pull-up resistors on all the I/Os

■ Outputs:

◆ Totem-pole (10 mA source, 15 mA sink) with controlled edge rate output structure

◆ Active LOW output enable (OE) input pin 3-states all outputs

◆ Output state change on Acknowledge

◆ Open-drain active LOW interrupt (INT) output pin allows monitoring of logic level change of pins programmed as inputs

PCA9505DGG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PCA9505DGGI/O 擴(kuò)展器該系列器件可與微控制器、微處理器或類(lèi)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(xiàn)，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。