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TCA9546APWR

4-ch I2C switch with reset and level translation, 1.65-5.5V, 400kHz, TSSOP-16

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Manufacturer Part：

TCA9546APWR

Package：

TSSOP-16 (PW) 5x6.4 mm

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Description

Product Overview

The TCA9546APWR from Texas Instruments is a 4-channel I2C/SMBus switch with reset and voltage-level translation in a TSSOP-16 (PW) package. Operating from 1.65V to 5.5V, it enables a single I2C master to communicate with up to 4 downstream I2C buses at different voltage levels, resolving address conflicts and supporting hot insertion with low RON switches.

Key Specifications

Channels 4 (1-to-4 bidirectional)
Supply Voltage 1.65V – 5.5V
I2C Frequency 0 – 400 kHz
Address Pins 3 (A0-A1-A2), up to 8 devices on bus
Reset Active-low RESET input
Level Translation 1.8V/2.5V/3.3V/5V between channels
I/O Tolerance 5.5V
ESD 4000V HBM, 1500V CDM
Package TSSOP-16 (PW) 5×6.4 mm
Temperature -40 to +85 deg C

Features

  • 1-of-4 bidirectional translating switches for I2C bus expansion
  • Voltage-level translation between 1.8V, 2.5V, 3.3V, and 5V buses
  • Active-low RESET input recovers from stuck downstream buses
  • Three address pins allow up to 8 TCA9546A devices on one I2C bus
  • Hot insertion support with no glitch on power-up

Applications

  • Server and router I2C bus expansion and isolation
  • Multi-sensor I2C networks with address conflict resolution
  • Mixed-voltage I2C bus bridging (1.8V to 5V)
  • Broadcast communication across multiple I2C segments
  • Industrial fault isolation on I2C buses

The TCA9546A is a 4-channel I2C/SMBus switch from Texas Instruments that enables a single I2C master to communicate with up to 4 downstream I2C buses. The upstream SCL/SDA pair fans out to four downstream channel pairs, any of which can be selected individually or in combination via the programmable control register. The pass-gate construction allows different bus voltages on each channel, enabling voltage-level translation between 1.8V, 2.5V, 3.3V, and 5V buses. The active-low RESET input recovers the device when a downstream bus is stuck low. With three address pins, up to 8 TCA9546A devices can coexist on the same I2C bus.

The TCA9546A operates as an I2C-controlled multiplexer for I2C buses. The master writes to the control register (via I2C) to select which downstream channels (0-3) are connected to the upstream bus. Each channel consists of a bidirectional analog switch connecting the upstream SCL/SDA to the downstream SCn/SDn. The pass gates are constructed so VCC limits the maximum high voltage passed, enabling level translation. External pull-up resistors on each downstream bus set the desired voltage level. When RESET is asserted low, the I2C state machine is reset and all channels are deselected. Power-on reset also deselects all channels, ensuring no bus conflicts during startup.

Pin Name Type Function
1 SC0 I/O Channel 0 downstream SCL
2 SD0 I/O Channel 0 downstream SDA
3 SC1 I/O Channel 1 downstream SCL
4 SD1 I/O Channel 1 downstream SDA
5 SC2 I/O Channel 2 downstream SCL
6 SD2 I/O Channel 2 downstream SDA
7 SC3 I/O Channel 3 downstream SCL
8 SD3 I/O Channel 3 downstream SDA
9 GND Power Ground
10-12 A0-A2 Input I2C address select
13 RESET Input Active-low reset
14 SCL I/O Upstream I2C clock
15 SDA I/O Upstream I2C data
16 VCC Power Supply (1.65-5.5V)
  • Multi-sensor I2C: resolve address conflicts by isolating identical-address sensors
  • Server I2C management: isolate FRU EEPROMs on different blades
  • Mixed-voltage bridging: connect 1.8V I2C sensors to 3.3V MCU bus
  • Broadcast mode: enable all channels simultaneously for I2C firmware update
  • Industrial fault isolation: reset stuck bus without powering down the system
Manufacturer Part Number Package Notes
TI PCA9546APWR TSSOP-16 Similar, 2.3-5.5V supply range
TI TCA9548APWR TSSOP-24 8-channel version
TI TCA9546ARGER VQFN-16 Smaller 4x4mm QFN package
NXP PCA9546APW TSSOP-16 Pin-compatible alternative
Renesas ISL9546AIRZ TSSOP-16 4-channel I2C MUX alternative
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