Overview
The PCA9543ADR, produced by Texas Instruments, is a dual bidirectional translating switch controlled by the I2C bus. This component is designed to manage multiple I2C or SMBus channels, allowing for the selection of either individual or both channels through a programmable control register. It is particularly useful in scenarios where multiple devices share the same I2C bus, such as in servers, routers, and factory automation systems. The PCA9543ADR also features interrupt logic and a reset function, making it versatile for various applications involving I2C communication.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Operating Power-Supply Voltage Range | 2.3 to 5.5 | V |
| Operating Temperature Range | -40 to 85 | °C |
| Package Type | SOIC (D) | - |
| Number of Pins | 14 | - |
| Clock Frequency | 0 to 400 kHz | - |
| ESD Protection | 2000-V Human-Body Model, 1000-V Charged-Device Model | - |
| I/O Tolerance | 5.5 V | - |
Key Features
- I2C Bus and SMBus Compatible
- 1-of-2 Bidirectional Translating Switches
- Two Active-Low Interrupt Inputs and One Active-Low Interrupt Output
- Active-Low Reset Input to Recover from Bus-Fault Conditions
- Two Address Pins Allowing up to Four 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 Voltage Drop
- Voltage-Level Translation Between 1.8-V, 2.5-V, 3.3-V, and 5-V Buses
- No Glitch on Power-up and Supports Hot Insertion
- Low Standby Current
Applications
- Servers and Data Centers
- Routers and Telecom Switching Equipment
- Factory Automation Systems
- Products With I2C Slave Address Conflicts (e.g., Multiple Identical Temperature Sensors)
Q & A
- What is the primary function of the PCA9543ADR?
The PCA9543ADR is a dual bidirectional translating switch controlled by the I2C bus, allowing the selection and management of multiple I2C or SMBus channels.
- What is the operating voltage range of the PCA9543ADR?
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 PCA9543ADR?
Up to four PCA9543ADR devices can be connected on the I2C bus, thanks to the two address pins.
- What is the purpose of the interrupt inputs and output on the PCA9543ADR?
The two interrupt inputs (INT1–INT0) provide signals for each downstream pair, and the interrupt output (INT) acts as an AND of the two interrupt inputs.
- How does the PCA9543ADR handle voltage translation between different bus voltages?
The PCA9543ADR allows voltage-level translation between 1.8-V, 2.5-V, 3.3-V, and 5-V buses without additional protection, using the VCC pin to limit the maximum high voltage.
- What is the role of the RESET input on the PCA9543ADR?
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, resetting the I2C state machine and deselecting both channels.
- Is the PCA9543ADR compatible with SMBus?
Yes, the PCA9543ADR is compatible with both I2C Bus and SMBus.
- What is the clock frequency range supported by the PCA9543ADR?
The PCA9543ADR supports a clock frequency range of 0 to 400 kHz.
- Does the PCA9543ADR support hot insertion?
Yes, the PCA9543ADR supports hot insertion.
- What is the ESD protection level of the PCA9543ADR?
The PCA9543ADR has ESD protection exceeding 2000-V Human-Body Model and 1000-V Charged-Device Model.
