Overview
The PCA9546ADW, produced by Texas Instruments, is a 4-channel bidirectional translating switch designed for I2C and SMBus applications. This component allows for the control and switching of four downstream I2C/SMBus channels via a single upstream I2C/SMBus interface. It supports voltage-level translation between different bus voltages, enabling communication between devices operating at 1.8-V, 2.5-V, 3.3-V, and 5-V levels. The device features an active-low reset input and supports hot insertion, making it versatile for various system designs.
Key Specifications
| Specification | Value |
|---|---|
| Package Type | SOIC (DW) with 16 pins |
| Operating Temperature Range | -40°C to 85°C |
| Operating Power-Supply Voltage Range | 2.3 V to 5.5 V |
| Input Voltage Tolerance | 5.5 V tolerant inputs |
| Clock Frequency | 0 to 400 kHz |
| Reset Input | Active-low reset input |
| Address Pins | Three address pins, allowing up to eight devices on the I2C bus |
| ESD Protection | Exceeds JESD 22; 2000-V Human-Body Model (A114-A), 1000-V Charged-Device Model (C101) |
Key Features
- 1-of-4 bidirectional translating switches
- I2C bus and SMBus compatible
- Active-low reset input to recover from stuck low states on downstream buses
- Three address pins allowing up to eight PCA9546A devices on the I2C bus
- Channel selection via I2C bus in any combination
- Power-up with all switch channels deselected
- Low RON switches
- 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
Applications
The PCA9546ADW is suitable for a variety of applications where multiple I2C or SMBus devices need to be connected to a single master device. This includes:
- Embedded systems requiring multiple I2C/SMBus peripherals
- Industrial control systems with multiple sensors and actuators
- Automotive systems integrating various I2C/SMBus devices
- Consumer electronics such as smart home devices and appliances
Q & A
- What is the PCA9546ADW?
The PCA9546ADW is a 4-channel bidirectional translating switch for I2C and SMBus applications, produced by Texas Instruments.
- What is the operating voltage range of the PCA9546ADW?
The operating power-supply voltage range is from 2.3 V to 5.5 V.
- How many devices can be connected on the I2C bus using the PCA9546ADW?
Up to eight PCA9546A devices can be connected on the I2C bus due to the three address pins.
- What is the purpose of the active-low reset input?
The active-low reset input allows the device to recover from a situation where one of the downstream I2C buses is stuck in a low state.
- Does the PCA9546ADW support hot insertion?
- What is the clock frequency range supported by the PCA9546ADW?
The clock frequency range is from 0 to 400 kHz.
- Is the PCA9546ADW ESD protected?
- What package types are available for the PCA9546ADW?
The PCA9546ADW is available in SOIC (DW) with 16 pins, among other package types.
- Can the PCA9546ADW handle different bus voltages?
- What is the operating temperature range of the PCA9546ADW?
The operating temperature range is from -40°C to 85°C.
