PCA9539 - 具有中断输出和复位配置的远程 16 位 I2C 和 SMBus 低功耗 I/O 扩展器寄存器

PCA9539是TI德州仪器公司的一款I2CIO扩展器产品，PCA9539是具有中断输出和复位配置的远程 16 位 I2C 和 SMBus 低功耗 I/O 扩展器寄存器，本站介绍了PCA9539的封装应用图解、特点和优点、功能等，并给出了与PCA9539相关的TI元器件型号供参考。

PCA9539 - 具有中断输出和复位配置的远程 16 位 I2C 和 SMBus 低功耗 I/O 扩展器寄存器 - I2CIO扩展器 - I2C - 德州仪器

产品描述

This 16-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 PCA9539 consists of two 8-bit Configuration (input or output selection), Input Port, Output Port, and Polarity Inversion (active-high or active-low operation) registers. At power-on, the I/Os are configured as inputs. 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 PCA9539 in the event of a time-out or other improper operation by asserting a low in the RESET input. The power-on reset puts the registers in their default state and initializes the I2C/SMBus state machine. Asserting RESET causes the same reset/initialization to occur without de-powering the part.

The PCA9539 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 PCA9539 can remain a simple slave device.

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

The PCA9539 is identical to the PCA9555, except for the removal of the internal I/O pullup resistor, which greatly reduces power consumption when the I/Os are held low, replacement of A2 with RESET, and a different address range.

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

产品特性

Low Standby-Current Consumption of 1μAMax
I2C to Parallel Port Expander
Open-Drain Active-Low Interrupt Output
Active-Low Reset Input
5-V Tolerant I/O Ports
Compatible With Most Microcontrollers
400-kHz Fast I2C Bus
Polarity Inversion Register
Address by Two Hardware Address Pins for Use of up to Four Devices
Latched Outputs With High-Current Drive Capability for Directly Driving LEDs
Latch-Up Performance Exceeds 100mA Per JESD78, ClassII
ESD Protection Exceeds JESD22
- 2000-V Human-Body Model (A114-A)
- 1000-V Charged-Device Model (C101)

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PCA9539 - 具有中断输出和复位配置的远程 16 位 I2C 和 SMBus 低功耗 I/O 扩展器 寄存器

PCA9539 - 具有中断输出和复位配置的远程 16 位 I2C 和 SMBus 低功耗 I/O 扩展器寄存器