Overview
The PCA9544APW/G-T, produced by NXP USA Inc., is a 4-channel I²C-bus multiplexer with interrupt logic. This device is designed to control and manage multiple I²C-bus channels, enabling communication between different devices on the bus. It is particularly useful in systems where multiple I²C devices share the same bus, allowing for selective channel switching and voltage level translation between different voltage domains.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Supply Voltage | 2.3 V ~ 3.6 V, 4.5 V ~ 5.5 V | V |
| Package Type | 20-TSSOP | |
| Interface | I²C, SMBus | |
| Number of Channels | 4 | |
| Interrupt Inputs | 4 active LOW | |
| Interrupt Output | 1 active LOW | |
| Address Pins | 3 (allowing up to 8 devices on the I²C-bus) | |
| Maximum Junction Temperature | 125 °C | °C |
| Ambient Operating Temperature | -40 °C to +85 °C | °C |
Key Features
- 1-of-4 bidirectional translating multiplexer controlled via the I²C-bus
- I²C-bus interface logic; compatible with SMBus
- Four active LOW interrupt inputs and one active LOW interrupt output
- Channel selection via I²C-bus
- Power-up with all multiplexer channels deselected
- Low Ron switches
- Voltage level translation between 1.8 V, 2.5 V, 3.3 V, and 5 V buses
- All I/O pins are 5 V tolerant
Applications
The PCA9544APW/G-T is suitable for various applications where multiple I²C devices need to be managed on a single bus. This includes:
- Embedded systems requiring multiple I²C peripherals
- Industrial control systems with multiple sensors and actuators
- Automotive systems with multiple I²C devices
- Consumer electronics with multiple I²C interfaces
Q & A
- What is the PCA9544APW/G-T used for?
The PCA9544APW/G-T is a 4-channel I²C-bus multiplexer used to manage and control multiple I²C devices on a single bus.
- What are the key features of the PCA9544APW/G-T?
Key features include 1-of-4 bidirectional translating multiplexing, I²C-bus interface logic, four active LOW interrupt inputs, and voltage level translation between different voltage domains.
- What is the package type of the PCA9544APW/G-T?
The PCA9544APW/G-T comes in a 20-TSSOP package.
- What is the supply voltage range for the PCA9544APW/G-T?
The supply voltage range is 2.3 V ~ 3.6 V and 4.5 V ~ 5.5 V.
- How many interrupt inputs and outputs does the PCA9544APW/G-T have?
The device has four active LOW interrupt inputs and one active LOW interrupt output.
- Can the PCA9544APW/G-T handle voltage level translation?
Yes, it can translate voltage levels between 1.8 V, 2.5 V, 3.3 V, and 5 V buses.
- What is the maximum junction temperature for the PCA9544APW/G-T?
The maximum junction temperature is 125 °C.
- Is the PCA9544APW/G-T compatible with SMBus?
Yes, it is compatible with SMBus.
- How many devices can be addressed on the I²C-bus using the PCA9544APW/G-T?
Up to 8 devices can be addressed on the I²C-bus using the 3 address pins.
- What happens during power-up of the PCA9544APW/G-T?
During power-up, all multiplexer channels are deselected.
