PCA9554A - 具有中断输出和配置寄存器的远程 8 位 I2C 和 SMBus I/O 扩展器

PCA9554A是TI德州仪器公司的一款I2CIO扩展器产品，PCA9554A是具有中断输出和配置寄存器的远程 8 位 I2C 和 SMBus I/O 扩展器，本站介绍了PCA9554A的封装应用图解、特点和优点、功能等，并给出了与PCA9554A相关的TI元器件型号供参考。

PCA9554A - 具有中断输出和配置寄存器的远程 8 位 I2C 和 SMBus I/O 扩展器 - I2CIO扩展器 - I2C - 德州仪器

产品描述

This 8-bit I/O expander for the two-line bidirectional bus (I2C) is designed for 2.3-V to 5.5-V VCC operation. It provides general-purpose remote I/O expansion for most microcontroller families via the I2C interface [serial clock (SCL), serial data (SDA)].

The PCA9554A consists of one 8-bit Configuration (input or output selection), Input, Output, and Polarity Inversion (active high or active low) registers. At power on, the I/Os are configured as inputs with a weak pullup to VCC. 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 system master can reset the PCA9554A in the event of a timeout or other improper operation by utilizing the power-on reset feature, which puts the registers in their default state and initializes the I2C/SMBus state machine.

The PCA9554A open-drain interrupt (INT) 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.

INT can be connected to the interrupt input of a microcontroller. By sending an interrupt signal on this line, the remote I/O can inform the microcontroller if there is incoming data on its ports without having to communicate via the I2C bus. Thus, the PCA9554A can remain a simple slave device.

The device's outputs (latched) have high-current drive capability for directly driving LEDs and low current consumption.

Three hardware pins (A0, A1, and A2) are used to program and vary the fixed I2C address and allow up to eight devices to share the same I2C bus or SMBus.

The PCA9554A is pin-to-pin and I2C address compatible with the PCF8574A. However, software changes are required, due to the enhancements in the PCA9554A over the PCF8574A.

The PCA9554A and PCA9554 are identical except for their fixed I2C address. This allows for up to 16 of these devices (8 of each) on the same I2C/SMBus.

产品特性

I2C to Parallel Port Expander
Open-Drain Active-Low Interrupt Output
Operating Power-Supply Voltage Range of 2.3V to 5.5V
5-V Tolerant I/Os
400-kHz Fast I2C Bus
Three Hardware Address Pins Allow up to Eight Devices on the I2C/SMBus
Input/Output Configuration Register
Polarity Inversion Register
Internal Power-On Reset
Power-Up With All Channels Configured as Inputs
No Glitch on Power Up
Latched Outputs With High-Current Drive Maximum Capability for Directly Driving LEDs
Latch-Up Performance Exceeds 100 mA Per JESD 78, Class II
ESD Protection Exceeds JESD 22
- 2000-V Human-Body Model (A114-A)
- 200-V Machine Model (A115-A)
- 1000-V Charged-Device Model (C101)

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