Overview
The PCA9544APWRG4 is a 4-channel, bidirectional translating multiplexer manufactured by Texas Instruments. This component is designed to control and manage multiple I2C and SMBus channels, making it an essential part of systems that require multiple devices to share the same bus. The PCA9544A is controlled via the I2C bus and allows one SCL/SDA pair to be selected at a time, determined by the contents of the programmable control register. It also features four active-low interrupt inputs and one active-low interrupt output, which acts as an AND of the four interrupt inputs. This device is particularly useful in scenarios where multiple devices with the same I2C slave address need to be managed, such as in server, router, and factory automation environments.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Number of Channels | 4 | - |
| Bus Compatibility | I2C, SMBus | - |
| Interrupt Inputs | 4 (INT3–INT0) | - |
| Interrupt Output | 1 (Active-low) | - |
| Package Type | TSSOP (20 pins) | - |
| Package Dimensions | 5.00 mm x 4.40 mm | mm |
| Voltage Tolerance | 1.8V, 2.5V, 3.3V, 5V | V |
| Junction-to-Ambient Thermal Resistance | 92 °C/W (DGV package) | °C/W |
| I/O Pin Tolerance | 5V tolerant | V |
Key Features
- 1-of-4 bidirectional translating switches
- I2C Bus and SMBus compatible
- Four active-low interrupt inputs and one active-low interrupt output
- Programmable control register to select channels
- Power-on reset function to initialize the I2C state machine
- Ability to handle different bus voltages on each pair (1.8V, 2.5V, 3.3V, 5V) without additional protection
- All I/O pins are 5V tolerant
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 PCA9544APWRG4 used for? The PCA9544APWRG4 is used as a 4-channel, bidirectional translating multiplexer to manage multiple I2C and SMBus channels.
- How many channels does the PCA9544APWRG4 support? It supports 4 channels.
- What types of buses is the PCA9544APWRG4 compatible with? It is compatible with I2C and SMBus.
- How many interrupt inputs and outputs does the PCA9544APWRG4 have? It has 4 interrupt inputs and 1 interrupt output.
- What is the package type of the PCA9544APWRG4? It comes in a TSSOP package with 20 pins.
- Can the PCA9544APWRG4 handle different bus voltages? Yes, it can handle different bus voltages (1.8V, 2.5V, 3.3V, 5V) without additional protection.
- Are the I/O pins of the PCA9544APWRG4 5V tolerant? Yes, all I/O pins are 5V tolerant.
- What is the purpose of the power-on reset function in the PCA9544APWRG4? The power-on reset function initializes the I2C state machine and sets the registers to their default state.
- In which applications is the PCA9544APWRG4 commonly used? It is commonly used in servers, routers, factory automation, and products with I2C slave address conflicts.
- How does the PCA9544APWRG4 manage multiple devices with the same I2C slave address? It manages multiple devices by allowing only one SCL/SDA pair to be selected at a time, determined by the programmable control register.
