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Product details

Parameters

Number of I/Os 16 Features Configuration registers, Interrupt pin VCC (Min) (V) 1.65 VCC (Max) (V) 5.5 Addresses 8 Rating Catalog Frequency (Max) (kHz) 400 Operating temperature range (C) -40 to 85 open-in-new Find other I2C general-purpose I/Os (GPIOs)

Package | Pins | Size

SSOP (DB) 24 64 mm² 8.2 x 7.8 TSSOP (PW) 24 34 mm² 4.4 x 7.8 VQFN (RGE) 24 16 mm² 4 x 4 WQFN (RTW) 24 16 mm² 4 x 4 open-in-new Find other I2C general-purpose I/Os (GPIOs)

Features

  • Low Standby-Current Consumption of 3.5 µA Maximum
  • 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
  • Configurable Slave Address with 3 Address Pins
  • 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)
    • 1000-V Charged-Device Model (C101)

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open-in-new Find other I2C general-purpose I/Os (GPIOs)

Description

This 16-bit I/O expander for the two-line bidirectional bus (I2C) is designed for 1.65-V to 5.5-V VCC operation. It provides general-purpose remote I/O expansion for most microcontroller families via the I2C interface.

The TCA9555 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.

The TCA9555 is identical to the TCA9535, except for the inclusion of the internal I/O pull-up resistor, which pulls the I/O to a default high when configured as an input and undriven.

Three hardware pins (A0, A1, and A2) are used to program the I2C address, which allows up to eight TCA9555 devices to share the same I2C bus or SMBus. The fixed I2C address of the TCA9555 is the same as the PCF8575, PCF8575C, and PCF8574, allowing up to eight of these devices in any combination to share the same I2C bus or SMBus.

open-in-new Find other I2C general-purpose I/Os (GPIOs)
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Technical documentation

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Type Title Date
* Datasheet TCA9555 Low-Voltage 16-Bit I2C and SMBus I/O Expander with Interrupt Output and Configuration Registers datasheet (Rev. E) Apr. 01, 2019
Application notes I2C Dynamic Addressing Apr. 25, 2019
Application notes Choosing the Correct I2C Device for New Designs Sep. 07, 2016
Application notes Understanding the I2C Bus Jun. 30, 2015
Application notes I2C Bus Pull-Up Resistor Calculation Feb. 13, 2015
User guides I/O Expander EVM User's Guide (Rev. A) Jul. 25, 2014

Design & development

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

Hardware development

EVALUATION BOARDS Download
document-generic User guide
$49.00
Description

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.

Features
  • IO expander evaluation through LEDs or broken out to headers
  • Input evaluation with on board pushbutton switches
  • Example code including necessary functions for each IO expander
EVALUATION BOARDS Download
document-generic User guide
$898.00
Description

The AM65x Evaluation Module provides a platform to quickly start evaluation of Sitara™ Arm® Cortex®-A53 AM65x Processors (AM6548AM6546AM6528AM6527AM6526) and accelerate development for HMI, networking, patient monitoring, and other industrial applications. It is a development platform based on (...)

Features
  • 3 gigabit Ethernet ports
  • 4GB DDR4 with ECC
  • On-board 16GB eMMC
  • On-board 512Mb OSPI Flash
  • 1-lane PCIe Gen3.1, USB 3.1, USB 2.0 and CSI-2 interfaces
EVALUATION BOARDS Download
document-generic User guide
$1,369.00
Description
The AM65x high security (HS) evaluation module provides a platform to evaluate secure boot and other security features of Sitara™ Arm® Cortex®-A53 AM65x Processors (AM6548, AM6546, AM6528, AM6527, AM6526). It is a development platform based on the quad core Cortex-A53, dual Cortex-R5F processor that (...)
Features
  • 3 gigabit Ethernet ports
  • 4GB DDR4 with ECC
  • On-board 16GB eMMC
  • On board 512MB OSPI Flash
  • 1-lane PCIe Gen3.1, USB 3.1, USB 2.0 and CSI-2 interfaces
EVALUATION BOARDS Download
document-generic User guide
$819.00
Description

Step 1: Order the IDK
Step 2: Download the Processor SDK
Step 3: Get the industrial protocol package
Step 4: Read the hardware user's guide

The AM65x Industrial Development Kit (IDK) is a development platform for evaluating the industrial communication and control capabilities of Sitara AM65x (...)

Features
  • Up to 6 industrial gigabit Ethernet ports and 1 standard gigabit Ethernet port that can be used concurrently
  • 4GB DDR4 with ECC
  • Profibus connection and industrial I/O header
  • On-board 16GB eMMC
  • On-board 512Mb OSPI Flash
  • 2-lane PCIe Gen3.1, USB 2.0 and CSI-2 interfaces
DEVELOPMENT KITS Download
document-generic User guide
$699.00
Description

The EVMK2GX (also known as "K2G") 1GHz Evaluation Module (EVM) enables developers to immediately start evaluating the 66AK2Gx processor family, and to accelerate the development of audio, industrial motor control, smart grid protection and other high reliability, real-time compute intensive (...)

Features
  • 66AK2G12 C66x DSP+ARM A15 Processor at 1GHz
  • 2-GByte DDR3L with ECC
  • TPS65911A PMIC
  • Audio and serial expansion headers
  • Processor SDK Linux and TI-RTOS support
DEVELOPMENT KITS Download
document-generic User guide
$1,049.00
Description

The K2G 1GHz High Secure Evaluation Module (EVM) enables developers to start  evaluating and testing the programming of the  high secure developmental version of the  66AK2Gx processor, and to accelerate the next stage of secure boot product development of audio and industrial real (...)

Features
  • 66AK2G12 C66x DSP+ARM A15 Processor at 1GHz
  • 2-GByte DDR3L with ECC
  • TPS65911A PMIC
  • Audio and serial expansion headers
  • Processor SDK Linux and TI-RTOS support

Software development

FIRMWARE Download
SLVC564A.ZIP (2137 KB)

Design tools & simulation

SIMULATION MODELS Download
SCPM041.ZIP (86 KB) - IBIS Model
SIMULATION TOOLS Download
SPICE-based analog simulation program
TINA-TI 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 (...)
document-generic User guide
DESIGN TOOLS Download
I2C designer tool
I2C-DESIGNER — Use the I2C Designer tool to quickly resolve conflicts in addressing, voltage level and frequency in I2C based designs. Enter master and slave inputs to automatically generate an I2C tree or easily build a custom solution. This tool will help designers save time and comply with the I2C standard with (...)
Features
  • GUI-based web application
  • Exportable designs
  • JSON file uploader
  • Bill of materials generator

CAD/CAE symbols

Package Pins Download
SSOP (DB) 24 View options
TSSOP (PW) 24 View options
VQFN (RGE) 24 View options
WQFN (RTW) 24 View options

Ordering & quality

Support & training

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