Overview
The PCA9544APW,118 from NXP USA Inc. is a 1-of-4 bidirectional translating multiplexer controlled via the I2C-bus. This device is designed to fan out the SCL/SDA upstream pair to four SCx/SDx downstream pairs or channels, with only one channel selected at a time based on the contents of the programmable control register. It features a power-on reset function that initializes the registers and the I2C-bus state machine with no channels selected, ensuring a clean startup. The multiplexer allows for voltage level translation between different bus voltages, enabling communication between 1.8 V, 2.5 V, 3.3 V, and 5 V parts without additional protection.
Key Specifications
| Parameter | Value |
|---|---|
| Interface Type | I2C |
| No of Channels | 4 |
| Clock Frequency-Max | 400 kHz |
| Supply Voltage-Nom | 2.3 V to 5.5 V |
| Supply Current | ±100mA |
| Package Style | TSSOP-20 |
| Mounting Method | Surface Mount |
| Address Pins | 3 (allowing up to 8 devices on the I2C-bus) |
| Interrupt Inputs | 4 active LOW |
| Interrupt Output | 1 active LOW |
| I/O Pin Tolerance | 5 V tolerant |
Key Features
- 1-of-4 bidirectional translating multiplexer
- I2C-bus interface logic; compatible with SMBus
- 4 active LOW interrupt inputs and 1 active LOW interrupt output
- 3 address pins allowing up to 8 devices on the I2C-bus
- Channel selection via I2C-bus
- Power-up with all multiplexer channels deselected
- Low Ron switches
- Allows 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
- ESD protection exceeds 2000 V HBM, 200 V MM, and 1000 V CDM
- Latch-up testing exceeds 100 mA per JEDEC Standard JESD78
Applications
The PCA9544APW,118 is suitable for various applications requiring I2C-bus multiplexing and voltage level translation. These include:
- Embedded systems where multiple I2C devices need to be connected to a single I2C bus.
- Industrial control systems that require communication between devices operating at different voltage levels.
- Automotive systems where robust and reliable I2C communication is crucial.
- Consumer electronics such as smart home devices and IoT applications.
Q & A
- What is the PCA9544APW,118?
The PCA9544APW,118 is a 1-of-4 bidirectional translating multiplexer controlled via the I2C-bus, designed for voltage level translation and multiplexing.
- What is the maximum clock frequency of the PCA9544APW,118?
The maximum clock frequency is 400 kHz.
- What is the supply voltage range for the PCA9544APW,118?
The supply voltage range is from 2.3 V to 5.5 V.
- How many interrupt inputs and outputs does the PCA9544APW,118 have?
It has 4 active LOW interrupt inputs and 1 active LOW interrupt output.
- Is the PCA9544APW,118 compatible with SMBus?
Yes, it is compatible with SMBus.
- What is the package style of the PCA9544APW,118?
The package style is TSSOP-20.
- Does the PCA9544APW,118 support hot insertion?
Yes, it supports hot insertion.
- What is the purpose of the power-on reset function in the PCA9544APW,118?
The power-on reset function initializes the registers and the I2C-bus state machine with no channels selected.
- Can the PCA9544APW,118 handle different bus voltages on each channel?
Yes, it allows voltage level translation between 1.8 V, 2.5 V, 3.3 V, and 5 V buses.
- Is the PCA9544APW,118 ESD protected?
Yes, it has ESD protection exceeding 2000 V HBM, 200 V MM, and 1000 V CDM.
