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TCA9548APWR

8-ch I2C switch/mux, 1.65-5.5V, 400kHz, 3 addr pins, reset, TSSOP-24

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Manufacturer Part：

TCA9548APWR

Package：

TSSOP-24 (7.8 x 4.4 x 1.2 mm, PW package)

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Description

Product Overview

The TCA9548APWR from Texas Instruments is an 8-channel I2C switch/multiplexer with reset, allowing a single I2C master to communicate with up to 8 I2C slave devices sharing the same address in a TSSOP-24 package.

Key Specifications

Function 8-Channel I2C Switch / Multiplexer
I2C Channels 1 master to 8 downstream channels
Supply Voltage 1.65V to 5.5V
I2C Clock Frequency 400 kHz (Fast Mode)
Address Pins 3 (A0-A2, 8 possible I2C addresses)
Reset Pin Yes (active LOW, RESET pin)
ESD Protection HBM >2000V
Package TSSOP-24 (4.4mm width)
Operating Temperature -40 to +85 C

Features

  • 8 bidirectional I2C downstream channels
  • 1-to-8 multiplexing or 1-to-any combination switching
  • 3 address pins for up to 8 devices on same I2C bus
  • Active-low reset pin
  • Zero standby current when no channel selected

Applications

  • Multiple I2C sensors with same address
  • I2C bus voltage isolation
  • Capacitive touch screen multiplexing
  • Server and telecom I2C management

The TCA9548APWR from Texas Instruments is an 8-channel I2C switch and multiplexer that enables a single I2C master to communicate with up to 8 independent I2C bus segments. The primary use case is when multiple I2C slave devices share the same I2C address (a common issue with sensors, EEPROMs, and other peripherals) – by connecting each device to a separate downstream channel, the master can select one channel at a time via I2C commands, avoiding address conflicts. The TCA9548A can also be used to isolate I2C bus segments with different voltage levels (each downstream channel can operate at a different voltage, as the TCA9548A has level-shifting capability), or to manage I2C bus capacitance by splitting a large bus into smaller segments. The device operates as an I2C slave itself with a configurable address (set by the A0-A2 pins, supporting up to 8 TCA9548A devices on the same master bus, for a total of 64 downstream channels). To select a downstream channel, the master writes to the TCA9548A’s control register via I2C, setting the corresponding channel bit(s). Multiple channels can be selected simultaneously if needed. The active-low RESET pin provides a hardware method to deselect all channels. The bidirectional pass-gate switches on each channel support I2C Fast Mode (400kHz) with minimal propagation delay and no signal distortion. The device operates from 1.65V to 5.5V and is available in a TSSOP-24 package.

The TCA9548APWR operates as an 8-channel I2C bus switch controlled via I2C. Key subsystems include: (1) I2C Slave Interface – the TCA9548A appears as an I2C slave device on the upstream (master) bus; the 7-bit slave address is determined by the A0-A2 pins (base address 0x70 + A0-A2 setting); the master writes to the internal control register to select which downstream channels are connected; (2) Control Register – an 8-bit register where each bit corresponds to a downstream channel (bit 0 = channel 0, bit 7 = channel 7); when a bit is set to 1, the corresponding channel’s SDA/SCL switches are closed, connecting the downstream bus to the upstream bus; when 0, the channel is disconnected; multiple bits can be set simultaneously; (3) Pass-Gate Switches – each downstream channel has bidirectional pass-gate switches on both SDA and SCL lines; these switches are MOSFET pass transistors that conduct in both directions when enabled; when disabled, the downstream channel is completely isolated from the upstream bus; (4) Voltage Level Shifting – the TCA9548A can be powered from the upstream VCC, while each downstream channel operates at the voltage of its own pull-up supply; the pass gates accommodate voltage differences between channels; (5) Reset – the active-low RESET pin clears the control register to 0x00 (all channels deselected), providing a known state during system initialization or fault recovery.

Pin Name Function
1 A0 Address bit 0
2 A1 Address bit 1
3 A2 Address bit 2
4 VCC Supply voltage (1.65V to 5.5V)
5-12 SD0-SD7 Downstream SDA channels 0-7
13-20 SC0-SC7 Downstream SCL channels 0-7
21 GND Ground
22 RESET Active-low reset (clears all channels)
23 SCL Upstream SCL (from master)
24 SDA Upstream SDA (from master)
  • 8 identical sensors: 8x BMP280 barometers (same 0x76 address) on separate channels, master selects one at a time
  • Voltage isolation: 3.3V MCU I2C master connects to both 1.8V and 5V downstream buses on separate channels
  • Capacitance management: split 400pF total bus capacitance into 8 x 50pF segments for reliable 400kHz operation
  • Server management: 8 I2C hardware monitoring ICs on different server blades accessed via one I2C master
Manufacturer Part Number Package Notes
TI TCA9548ARVCR QFN-24 Smaller QFN package
NXP PCA9548APW TSSOP-24 NXP equivalent, similar function
TI TCA9545APWR TSSOP-24 4-channel version with interrupt
NXP PCA9547PW TSSOP-24 8-channel mux (1-of-8, not switch)
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