Overview
The PCA9546ARGVR, produced by Texas Instruments, is a 4-channel I2C and SMBus switch designed to manage multiple I2C or SMBus devices on a single bus. This quad bidirectional translating switch allows for the selection of any individual or combination of the four downstream channels via the I2C bus. It is particularly useful in applications where multiple devices share the same I2C address or where voltage-level translation between different bus voltages is necessary.
Key Specifications
| Specification | Value |
|---|---|
| Package Type | VQFN (RGV) with 16 pins |
| Operating Power-Supply Voltage Range | 2.3 V to 5.5 V |
| Operating Temperature Range | -40°C to 85°C |
| Clock Frequency | 0 to 400 kHz |
| Input Voltage Tolerance | 5.5 V tolerant inputs |
| ESD Protection | 2000-V Human-Body Model (A114-A), 1000-V Charged-Device Model (C101) |
| Address Pins | Three address pins, allowing up to eight PCA9546A devices on the I2C bus |
| Reset Input | Active-low reset input |
| Voltage Translation | Allows translation between 1.8-V, 2.5-V, 3.3-V, and 5-V buses |
Key Features
- 1-of-4 bidirectional translating switches
- I2C bus and SMBus compatible
- Active-low reset input to recover from stuck I2C bus states
- 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 for minimal resistance
- No glitch on power-up
- Supports hot insertion
- Low standby current
- Latch-up performance exceeds 100 mA per JESD 78
Applications
- Servers
- Routers (Telecom Switching Equipment)
- Factory Automation
- Products with I2C slave address conflicts (e.g., multiple identical temperature sensors)
Q & A
- What is the PCA9546ARGVR used for?
The PCA9546ARGVR is used to manage multiple I2C or SMBus devices on a single bus, allowing for channel selection and voltage-level translation.
- What is the operating voltage range of the PCA9546ARGVR?
The operating power-supply voltage range is from 2.3 V to 5.5 V.
- How many PCA9546A devices can be connected on the same I2C bus?
Up to eight PCA9546A devices can be connected on the same I2C bus using the three address pins.
- What is the purpose of the active-low reset input?
The active-low reset input allows the PCA9546A to recover from a situation where one of the downstream I2C buses is stuck in a low state.
- Does the PCA9546ARGVR support hot insertion?
- What is the clock frequency range supported by the PCA9546ARGVR?
The clock frequency range is from 0 to 400 kHz.
- Is the PCA9546ARGVR protected against ESD?
- Can the PCA9546ARGVR handle different bus voltages?
- What is the standby current of the PCA9546ARGVR?
The PCA9546ARGVR has a low standby current.
- What is the package type of the PCA9546ARGVR?
The PCA9546ARGVR comes in a VQFN (RGV) package with 16 pins.
