PCA9555 Remote 16-Bit I2C And SMBus I/O Expander With Interrupt Output And Configuration Registers | TI.com

PCA9555 (ACTIVE)

Remote 16-Bit I2C And SMBus I/O Expander With Interrupt Output And Configuration Registers

 

Recommended alternative parts

  • TCA9555  -  The same functionality as the PCA9555, but with performance enhancements for power-on reset, interrupt, and lower voltage operation

Description

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 PCA9555 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.

Features

  • Low Standby-Current Consumption of 1 µA Max
  • I2C to Parallel Port Expander
  • Open-Drain Active-Low Interrupt Output
  • 5-V Tolerant I/O Ports
  • Compatible With Most Microcontrollers
  • 400-kHz Fast I2C Bus
  • Address by Three Hardware Address Pins for Use of up to Eight Devices
  • Polarity Inversion Register
  • Latched Outputs With High-Current Drive 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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Parametrics Compare all products in I2C general purpose I/O (GPIO)

 
Number of I/Os
VCC (Min) (V)
VCC (Max) (V)
GPIO
Frequency (Max) (kHz)
Features
Addresses
Rating
Operating Temperature Range (C)
Package Group
PCA9555
16    
2.3    
5.5    
VCC    
400    
Configuration Registers
Interrupt Pin    
8    
Catalog    
-40 to 85    
SOIC | 24
SSOP | 24
SSOP | 24
TSSOP | 24
TVSOP | 24
VQFN | 24