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TCA6408A-Q1

ACTIVE

Automotive 8-bit translating I2C/SMBus I/O expander with interrupt, reset & config registers

Product details

Number of I/Os 8 Features Adjustable I/O level, Configuration registers, Interrupt pin, Reset pin Supply voltage (min) (V) 1.65 Supply voltage (max) (V) 3.6 Addresses 2 Rating Automotive Frequency (max) (MHz) 0.4 Operating temperature range (°C) -40 to 125
Number of I/Os 8 Features Adjustable I/O level, Configuration registers, Interrupt pin, Reset pin Supply voltage (min) (V) 1.65 Supply voltage (max) (V) 3.6 Addresses 2 Rating Automotive Frequency (max) (MHz) 0.4 Operating temperature range (°C) -40 to 125
TSSOP (PW) 16 32 mm² 5 x 6.4
  • AEC-Q100 qualified for automotive applications
    • Temperature grade 1: –40°C to +125°C, TA
  • Functional Safety-Capable
  • I2C to parallel port expander
  • Operating power-supply voltage range of 1.65 V to 3.6 V
  • Allows bidirectional voltage-level translation and GPIO expansion between 1.8-, 2.5-, and 3.3-V I2C bus and P-ports
  • Low standby current consumption
  • 400-kHz Fast I2C Bus
  • Hardware address pin allows Two TCA6408A-Q1 devices on the same I2C/SMBus bus
  • Active-low reset ( RESET) input
  • Open-drain active-low interrupt ( INT) output
  • 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 and SDA inputs
  • Latched outputs with high-current drive maximum capability for directly driving LEDs
  • Latch-up performance meets 100 mA per AEC Q100-004
  • Schmitt-Trigger action allows slow input transition and better switching noise immunity at the SCL and SDA inputs
  • ESD protection
    • 2000-V Human body model (Q100-002)
    • 1000-V Charged-device model (Q100-011)
  • AEC-Q100 qualified for automotive applications
    • Temperature grade 1: –40°C to +125°C, TA
  • Functional Safety-Capable
  • I2C to parallel port expander
  • Operating power-supply voltage range of 1.65 V to 3.6 V
  • Allows bidirectional voltage-level translation and GPIO expansion between 1.8-, 2.5-, and 3.3-V I2C bus and P-ports
  • Low standby current consumption
  • 400-kHz Fast I2C Bus
  • Hardware address pin allows Two TCA6408A-Q1 devices on the same I2C/SMBus bus
  • Active-low reset ( RESET) input
  • Open-drain active-low interrupt ( INT) output
  • 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 and SDA inputs
  • Latched outputs with high-current drive maximum capability for directly driving LEDs
  • Latch-up performance meets 100 mA per AEC Q100-004
  • Schmitt-Trigger action allows slow input transition and better switching noise immunity at the SCL and SDA inputs
  • ESD protection
    • 2000-V Human body model (Q100-002)
    • 1000-V Charged-device model (Q100-011)

The TCA6408A-Q1 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. This device can operate with a power supply voltage ranging from 1.65 V to 3.6 V on both the I2C bus side (VCCI) and on the P-port side (VCCP). This allows the TCA6408A-Q1 to interface with next-generation microprocessors and microcontrollers on the SDA/SCL side, where supply levels are dropping down to conserve power. In contrast to the dropping power supplies of microprocessors and microcontrollers, some PCB components such as LEDs remain at a higher power supply.

The device supports both 100-kHz (Standard-mode) and 400-kHz (Fast-mode) clock frequencies. I/O expanders such as the TCA6408A-Q1 provide a simple solution when additional I/Os are needed for switches, sensors, push-buttons, LEDs, fans, and so forth.

The TCA6408A-Q1 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. This device can operate with a power supply voltage ranging from 1.65 V to 3.6 V on both the I2C bus side (VCCI) and on the P-port side (VCCP). This allows the TCA6408A-Q1 to interface with next-generation microprocessors and microcontrollers on the SDA/SCL side, where supply levels are dropping down to conserve power. In contrast to the dropping power supplies of microprocessors and microcontrollers, some PCB components such as LEDs remain at a higher power supply.

The device supports both 100-kHz (Standard-mode) and 400-kHz (Fast-mode) clock frequencies. I/O expanders such as the TCA6408A-Q1 provide a simple solution when additional I/Os are needed for switches, sensors, push-buttons, LEDs, fans, and so forth.

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Technical documentation

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Type Title Date
* Data sheet TCA6408A-Q1 Low-Voltage 8-Bit I2C and SMBus I/O Expander With Interrupt Output datasheet (Rev. A) PDF | HTML 06 Feb 2023
Application note Understanding Transient Drive Strength vs. DC Drive Strength in Level-Shifters (Rev. A) PDF | HTML 03 Jul 2024
Functional safety information TCA6408A-Q1 Functional Safety FIT Rate, FMD and Pin FMA PDF | HTML 29 Oct 2020
Application note I2C Dynamic Addressing 25 Apr 2019

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

TCA6408A IBIS Model

SCPM014.ZIP (107 KB) - IBIS Model
Design tool

I2C-DESIGNER — I2C designer tool

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 (...)
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
Reference designs

TIDA-020060 — Automotive power over data lines reference design for 100/1000Base-T1 Ethernet applications

This reference design demonstrates an implementation of Power over Data Lines (PoDL) for automotive use cases. The design uses a DP83TG720S-Q1 1000MBit/s single-pair Ethernet (SPE) PHY with the option to switch to the DP83TC812S-Q1 SPE PHY for 100MBit/s operation. A coupling and decoupling network (...)
Design guide: PDF
Package Pins CAD symbols, footprints & 3D models
TSSOP (PW) 16 Ultra Librarian

Ordering & quality

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Information included:
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