8-channel 1.65- to 5.5-V I2C/SMBus switch with reset & voltage translation
Product details
Parameters
Package | Pins | Size
Features
- 1-to-8 Bidirectional translating switches
- I2C Bus and SMBus compatible
- Active-low reset input
- Three address pins, allowing up to eight TCA9548A devices on the I2C bus
- Channel selection through an I2C Bus, in any combination
- Power up with all switch channels deselected
- Low RON switches
- Allows voltage-level translation between 1.8-V, 2.5-V, 3.3-V, and 5-V buses
- No glitch on power up
- Supports hot insertion
- Low standby current
- Operating power-supply voltage range of
1.65 V to 5.5 V - 5-V Tolerant inputs
- 0- to 400-kHz Clock frequency
- Latch-up performance exceeds 100 mA Per JESD 78, class II
- ESD Protection exceeds JESD 22
- ±2000-V Human-body model (A114-A)
- 200-V Machine model (A115-A)
- ±1000-V Charged-device model (C101)
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Description
The TCA9548A device has eight bidirectional translating switches that can be controlled through the I2C bus. The SCL/SDA upstream pair fans out to eight downstream pairs, or channels. Any individual SCn/SDn channel or combination of channels can be selected, determined by the contents of the programmable control register. These downstream channels can be used to resolve I2C slave address conflicts. For example, if eight identical digital temperature sensors are needed in the application, one sensor can be connected at each channel: 0-7.
The system master can reset the TCA9548A in the event of a time-out or other improper operation by asserting a low in the RESET input. Similarly, the power-on reset deselects all channels and initializes the I2C/SMBus state machine. Asserting RESET causes the same reset and initialization to occur without powering down the part. This allows recovery should one of the downstream I2C buses get stuck in a low state.
The pass gates of the switches are constructed so that the VCC pin can be used to limit the maximum high voltage, which is passed by the TCA9548A. Limiting the maximum high voltage allows the use of different bus voltages on each pair, so that 1.8-V, 2.5-V or 3.3-V parts can communicate with 5-V parts, without any additional protection. External pullup resistors pull the bus up to the desired voltage level for each channel. All I/O pins are 5-V tolerant.
Technical documentation
Type | Title | Date | |
---|---|---|---|
* | Datasheet | TCA9548A Low-Voltage 8-Channel I2C Switch with Reset datasheet (Rev. G) | Nov. 30, 2018 |
Application note | I2C Solutions for Hot Swap Applications | Jan. 31, 2020 | |
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 | |
Technical articles | How to simplify I2C tree when connecting multiple slaves to an I2C master | Oct. 15, 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 | |
Technical articles | Haptics: More actuators needed? No problem. | Dec. 03, 2014 | |
User guide | TCA9548AEVM User's Guide | Apr. 23, 2014 |
Design & development
For additional terms or required resources, click any title below to view the detail page where available.Hardware development
Description
The TCA9548AEVM is designed to evaluate and demonstrate the functionality of TI’s TCA954xA family of I2C switches. The TCA9548AEVM can be used as a standalone evaluation module to interface with an existing system or paired with the MSP430 Lauchpad which serves as the I2C master and power supply for (...)
Features
- Evaluate the TCA954xA family of I2C switches
- Pair with the MSP430 Launchpad
- Demonstrate I2C communication with TMP102 Temperature sensors
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-01414 BOM.pdf (113KB) -
download TIDA-01414 Assembly Drawing.pdf (769KB) -
download TIDA-01414 PCB.pdf (7121KB) -
download TIDA-01414 CAD Files.zip (3928KB) -
download TIDA-01414 Gerber.zip (8312KB)
Design files
-
download TIDA-01373 BOM (PB).pdf (65KB) -
download TIDA-01373 BOM (SB).pdf (65KB) -
download TIDA-01373 Assembly Drawing (PB).pdf (526KB) -
download TIDA-01373 Assembly Drawing (SB).pdf (622KB) -
download TIDA-01373 PCB (PB).pdf (2578KB) -
download TIDA-01373 PCB (SB).pdf (2760KB) -
download TIDA-01373 CAD Files (PB).zip (1856KB) -
download TIDA-01373 CAD Files (SB).zip (1491KB) -
download TIDA-01373 Gerber (PB).zip (1041KB) -
download TIDA-01373 Gerber (SB).zip (833KB)
CAD/CAE symbols
Package | Pins | Download |
---|---|---|
TSSOP (PW) | 24 | View options |
VQFN (RGE) | 24 | 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
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