TCA9538 Remote 8-Bit I2C and SMBus Low-Power I/O Expander | TI.com

TCA9538 (ACTIVE)

Remote 8-Bit I2C and SMBus Low-Power I/O Expander

 

Description

The TCA9538 is a 16-pin device that provides 8 bits of general purpose parallel input and output (I/O) expansion for the two-line bidirectional I2C bus (or SMBus) protocol. The device can operate with a power supply voltage ranging from 1.65 V to 5.5 V. The device supports both 100-kHz (Standard-mode) and 400-kHz (Fast-mode) clock frequencies. I/O expanders such as the TCA9538 provide a simple solution when additional I/Os are needed for switches, sensors, push-buttons, LEDs, fans, etc.

The features of the TCA9538 include an interrupt that is generated on the INT pin whenever an input port changes state. The A0 and A1 hardware selectable address pins allow up to four TCA9538 devices on the same I2C bus. The device can also be reset to its default sate by using the RESET feature or by cycling the power supply and causing a power-on reset.

Features

  • Low Standby Current Consumption
  • I2C to Parallel Port Expander
  • Open-Drain Active-Low Interrupt Output
  • Active-Low Reset Input
  • Operating Power-Supply Voltage Range of 1.65 V to 5.5 V
  • 5-V Tolerant I/O Ports
  • 400-kHz Fast I2C Bus
  • Two Hardware Address Pins Allow up to Four Devices on the I2C/SMBus
  • Input and Output Configuration Register
  • Polarity Inversion Register
  • 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)
    • 1000-V Charged-Device Model (C101)

View more

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
TCA9538 PCA9534 PCA9534A TCA6408A TCA9539 TCA9539-Q1 TCA9554
8     8     8     8     16     16     8    
1.65     2.3     2.3     1.65     1.65     1.65     1.65    
5.5     5.5     5.5     5.5     5.5     3.6     5.5    
VCC     VCC     VCC     Adjustable     VCC     VCC     VCC    
400     400     400     400     400     400     400    
Configuration Registers
Interrupt Pin
Reset Pin    
Configuration Registers
Interrupt Pin    
Configuration Registers
Interrupt Pin    
Configuration Registers
Interrupt Pin
Reset Pin    
Configuration Registers
Interrupt Pin
Reset Pin    
Configuration Registers
Interrupt Pin
Reset Pin    
Configuration Registers
Interrupt Pin    
4     8     8     2     4     4     8    
Catalog     Catalog     Catalog     Catalog     Catalog     Automotive     Catalog    
-40 to 85     -40 to 85     -40 to 85     -40 to 85     -40 to 85     -40 to 125     -40 to 85    
SSOP | 16
TSSOP | 16    
SOIC | 16
SSOP | 16
TSSOP | 16
TVSOP | 16
VQFN | 16    
SOIC | 16
SSOP | 16
TSSOP | 16
TVSOP | 16
VQFN | 16
VQFN | 16    
TSSOP | 16
UQFN | 16
VQFN | 16    
TSSOP | 24
VQFN | 24
WQFN | 24    
TSSOP | 24     SOIC | 16
SSOP | 16
SSOP | 16
TSSOP | 16