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TCA9534A

ACTIVE

8-bit 1.65- to 5.5-V I2C/SMBus I/O expander with interrupt, & config registers

Product details

Number of I/Os 8 Features Configuration registers, Interrupt pin Supply voltage (min) (V) 1.65 Supply voltage (max) (V) 5.5 Addresses 8 Rating Catalog Frequency (max) (MHz) 0.4 Operating temperature range (°C) -40 to 85
Number of I/Os 8 Features Configuration registers, Interrupt pin Supply voltage (min) (V) 1.65 Supply voltage (max) (V) 5.5 Addresses 8 Rating Catalog Frequency (max) (MHz) 0.4 Operating temperature range (°C) -40 to 85
SOIC (DW) 16 106.09 mm² 10.3 x 10.3 TSSOP (PW) 16 32 mm² 5 x 6.4
  • Low Standby Current Consumption
  • I2C to Parallel Port Expander
  • Open-Drain Active-Low Interrupt Output
  • Operating Power-Supply Voltage Range of 1.65 V to 5.5 V
  • 5-V Tolerant I/O Ports
  • 400-kHz Fast I2C Bus
  • Three Hardware Address Pins Allow up to Eight Devices on the I2C/SMBus
  • Input and Output Configuration Register
  • Polarity Inversion Register
  • Internal Power-On Reset
  • 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)
  • Low Standby Current Consumption
  • I2C to Parallel Port Expander
  • Open-Drain Active-Low Interrupt Output
  • Operating Power-Supply Voltage Range of 1.65 V to 5.5 V
  • 5-V Tolerant I/O Ports
  • 400-kHz Fast I2C Bus
  • Three Hardware Address Pins Allow up to Eight Devices on the I2C/SMBus
  • Input and Output Configuration Register
  • Polarity Inversion Register
  • Internal Power-On Reset
  • 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)

The TCA9534A 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, which allows for use with a wide range of devices. The device supports both 100-kHz (Standard-mode) and 400-kHz (Fast-mode) clock frequencies. I/O expanders such as the TCA9534A provide a simple solution when additional I/Os are needed for switches, sensors, push-buttons, LEDs, fans, and other similar devices.

The features of the TCA9534A include an interrupt that is generated on the INT pin. This allows the master to know when an input port changes state. The A0, A1, and A2 hardware selectable address pins allow up to eight TCA9534A devices on the same I2C bus. The device can also be reset to its default sate by cycling the power supply and causing a power-on reset.

The TCA9534A 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, which allows for use with a wide range of devices. The device supports both 100-kHz (Standard-mode) and 400-kHz (Fast-mode) clock frequencies. I/O expanders such as the TCA9534A provide a simple solution when additional I/Os are needed for switches, sensors, push-buttons, LEDs, fans, and other similar devices.

The features of the TCA9534A include an interrupt that is generated on the INT pin. This allows the master to know when an input port changes state. The A0, A1, and A2 hardware selectable address pins allow up to eight TCA9534A devices on the same I2C bus. The device can also be reset to its default sate by cycling the power supply and causing a power-on reset.

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Technical documentation

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Type Title Date
* Data sheet TCA9534A Low Voltage 8-Bit I2C and SMBUS Low-Power I/O Expander With Interrupt Output and Configuration Registers datasheet (Rev. C) PDF | HTML 19 Jan 2017
Application note Understanding Transient Drive Strength vs. DC Drive Strength in Level-Shifters (Rev. A) PDF | HTML 03 Jul 2024
Application note I2C Dynamic Addressing 25 Apr 2019
Application note Choosing the Correct I2C Device for New Designs PDF | HTML 07 Sep 2016
Application note Understanding the I2C Bus PDF | HTML 30 Jun 2015
Application note Maximum Clock Frequency of I2C Bus Using Repeaters 15 May 2015
Application note I2C Bus Pull-Up Resistor Calculation PDF | HTML 13 Feb 2015
EVM User's guide I/O Expander EVM User's Guide (Rev. A) 25 Jul 2014

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Evaluation board

IO-EXPANDER-EVM — IO-EXPANDER-EVM: I2C and SMBus IO Expander Evaluation Module

The IO expander evaluation module (EVM) lets you evaluate TI's portfolio of SMBus and I2C IO expander line devices. The TCA6424A and TCA9539 come installed on the board. The 24-pin TSSOP footprint also supports TCA6408A, TCA6416A, TCA9534, TCA9534ATCA9535, TCA9538, TCA9554, TCA9554A and TCA9555.

User guide: PDF
Not available on TI.com
Firmware

SLVC564 I/O Expander Software and Firmware Package

Supported products & hardware

Supported products & hardware

Products
I2C general-purpose I/Os (GPIOs)
TCA6408A 8-bit translating 1.65- to 5.5-V I2C/SMBus I/O expander with interrupt, reset & config registers TCA6408A-Q1 Automotive 8-bit translating I2C/SMBus I/O expander with interrupt, reset & config registers TCA6416A 16-bit translating 1.65- to 5.5-V I2C/SMBus I/O expander with interrupt, reset & config registers TCA6424A 24-bit translating 1.65- to 5.5-V I2C/SMBus I/O expander with interrupt, reset & config registers TCA9534 8-bit 1.65- to 5.5-V I2C/SMBus I/O expander with interrupt & config registers TCA9534A 8-bit 1.65- to 5.5-V I2C/SMBus I/O expander with interrupt, & config registers TCA9535 16-bit 1.65- to 5.5-V I2C/SMBus I/O expander with interrupt & config registers TCA9538 8-bit 1.65- to 5.5-V I2C/SMBus I/O expander with interrupt, reset & config registers TCA9539 16-bit 1.65- to 5.5-V I2C/SMBus I/O expander with interrupt, reset & config registers TCA9554 8-bit 1.65- to 5.5-V I2C/SMBus I/O expander with interrupt, weak pull-up & config registers TCA9554A 8-bit 1.65- to 5.5-V I2C/SMBus I/O expander with interrupt, weak pull-up & config registers TCA9555 16-bit 1.65- to 5.5-V I2C/SMBus I/O expander with interrupt, weak pull-up & config registers
Hardware development
Evaluation board
IO-EXPANDER-EVM IO-EXPANDER-EVM: I2C and SMBus IO Expander Evaluation Module
Simulation model

TCA9534 IBIS Model

SCPM037.ZIP (148 KB) - IBIS Model
Design tool

I2C-DESIGNER — I2C designer tool

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Simulation tool

PSPICE-FOR-TI — PSpice® for TI design and simulation tool

PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
Simulation tool

TINA-TI — SPICE-based analog simulation program

TINA-TI provides all the conventional DC, transient and frequency domain analysis of SPICE and much more. TINA has extensive post-processing capability that allows you to format results the way you want them. Virtual instruments allow you to select input waveforms and probe circuit nodes voltages (...)
User guide: PDF
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Package Pins CAD symbols, footprints & 3D models
SOIC (DW) 16 Ultra Librarian
TSSOP (PW) 16 Ultra Librarian

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Information included:
  • Fab location
  • Assembly location

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