8-bit translating 1.65- to 5.5-V I2C/SMBus I/O expander with interrupt, reset & config registers
Product details
Parameters
Package | Pins | Size
Features
- I2C to Parallel Port Expander
- Operating Power-Supply Voltage Range of 1.65 V to 5.5 V
- Allows Bidirectional Voltage-Level Translation and GPIO Expansion Between 1.8-V, 2.5-V, 3.3-V, and 5-V I2C Bus and P-Ports
- Low Standby Current Consumption of 1 μA
- 5-V Tolerant I/O Ports
- 400-kHz Fast I2C Bus
- Hardware Address Pin Allows Two TCA6408A Devices on the Same I2C/SMBus Bus
- Active-Low Reset (RESET) Input
- Open-Drain Active-Low Interrupt (INT) Output
- Input/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
- Schmitt-Trigger Action Allows Slow Input Transition and Better Switching Noise Immunity at the SCL and SDA Inputs
- ESD Protection Exceeds JESD 22
- 2000-V Human Body Model (A114-A)
- 1000-V Charged-Device Model (C101)
All trademarks are the property of their respective owners.
Description
The TCA6408A is a 16-pin device that provides 8-bits of general purpose parallel input/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 5.5 V on both the I2C bus side (VCCI) and on the P-port side (VCCP). This allows the TCA6408A 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 5-V power supply.
The device supports both 100-kHz (Standard-mode) and 400-kHz (Fast-mode) clock frequencies. I/O expanders such as the TCA6408A provide a simple solution when additional I/Os are needed for switches, sensors, push-buttons, LEDs, fans, and so forth.
Technical documentation
Type | Title | Date | |
---|---|---|---|
* | Datasheet | Low-Voltage 8-Bit, I2C and SMBus I/O Expander datasheet (Rev. D) | Jul. 20, 2015 |
Application note | I2C Dynamic Addressing | Apr. 25, 2019 | |
Application note | Choosing the Correct I2C Device for New Designs | Sep. 07, 2016 | |
Selection guide | I2C Infographic Flyer | Dec. 03, 2015 | |
Application note | Understanding the I2C Bus | Jun. 30, 2015 | |
Application note | Maximum Clock Frequency of I2C Bus Using Repeaters | May 15, 2015 | |
Application note | I2C Bus Pull-Up Resistor Calculation | Feb. 13, 2015 | |
User guide | 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
Description
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
Software development
Design tools & simulation
Features
- Leverages Cadence PSpice Technology
- Preinstalled library with a suite of digital models to enable worst-case timing analysis
- Dynamic updates ensure you have access to most current device models
- Optimized for simulation speed without loss of accuracy
- Supports simultaneous analysis of multiple products
- (...)
Features
- GUI-based web application
- Exportable designs
- JSON file uploader
- Bill of materials generator
Reference designs
Design files
-
download TIDA-00609 BOM.pdf (125KB) -
download TIDA-00609 Assembly Drawing.pdf (1219KB) -
download TIDA-00609 PCB.pdf (2187KB) -
download TIDA-00609 CAD Files.zip (24452KB) -
download TIDA-00609 Gerber.zip (7534KB)
Design files
-
download TIDA-00110 BOM.pdf (57KB) -
download TIDA-00110 Assembly Drawing.pdf (455KB) -
download TIDA-00110 PCB.pdf (2249KB) -
download TIDA-00110 Gerber.zip (477KB) -
download TIDA-00110 Altium.zip (3158KB)
Design files
-
download TIDA-00310 BOM.pdf (21KB) -
download TIDA-00310 Assembly Drawing.pdf (343KB) -
download TIDA-00310 PCB.pdf (2563KB) -
download TIDA-00310 Altium.zip (1530KB) -
download TIDA-00310 Gerber.zip (1566KB)
Design files
-
download TIDA-00018 BOM.pdf (202KB) -
download TIDA-00018 PCB.pdf (645KB) -
download TIDA-00018 Altium.zip (3888KB) -
download TIDA-00018 Gerber.zip (319KB)
CAD/CAE symbols
Package | Pins | Download |
---|---|---|
TSSOP (PW) | 16 | View options |
UQFN (RSV) | 16 | View options |
VQFN (RGT) | 16 | View options |
Ordering & quality
- RoHS
- REACH
- Device marking
- Lead finish/Ball material
- MSL rating/Peak reflow
- MTBF/FIT estimates
- Material content
- Qualification summary
- Ongoing reliability monitoring
Recommended products may have parameters, evaluation modules or reference designs related to this TI product.
Support & training
TI E2E™ forums with technical support from TI engineers
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