PCA9557 - 具有复位和配置寄存器的远程 8 位 I2C 和 SMBus 低功率 I/O 扩展器

PCA9557是TI德州仪器公司的一款I2CIO扩展器产品，PCA9557是具有复位和配置寄存器的远程 8 位 I2C 和 SMBus 低功率 I/O 扩展器，本站介绍了PCA9557的封装应用图解、特点和优点、功能等，并给出了与PCA9557相关的TI元器件型号供参考。

PCA9557 - 具有复位和配置寄存器的远程 8 位 I2C 和 SMBus 低功率 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. The device provides general-purpose remote I/O expansion for most microcontroller families via the I2C interface [serial clock (SCL) and serial data (SDA)].

The PCA9557 consists of one 8-bit configuration (input or output selection), input port, output port, and polarity inversion (active-high) registers. At power on, the I/Os are configured as inputs. 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 device outputs (latched) have high-current drive capability for directly driving LEDs. The device has low current consumption.

The system master can reset the PCA9557 in the event of a timeout or other improper operation by asserting a low in the active-low reset (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 depowering the part.

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

产品特性

Low Standby Current Consumption of 1μAMax
I2C to Parallel Port Expander
Operating Power-Supply Voltage Range of 2.3V to 5.5V
5-V Tolerant I/O Ports
400-kHz Fast I2C Bus
Three Hardware Address Pins Allow for Use of up to Eight Devices on I2C/SMBus
Lower-Voltage Higher-Performance Migration Path for PCA9556
Input/Output Configuration Register
Polarity Inversion Register
Active-Low Reset Input
Internal Power-On Reset
High-Impedance Open Drain on P0
Power Up With All Channels Configured as Inputs
No Glitch on Power Up
Noise Filter on SCL/SDA Inputs
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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