Overview
The PCA9547PW,118, produced by NXP USA Inc., is an 8-channel I2C-bus multiplexer with reset functionality. This device is designed to manage multiple I2C-bus channels, allowing a single upstream I2C-bus to be fanned out to eight downstream channels. The PCA9547 is particularly useful in systems where multiple devices need to share the same I2C-bus, enabling efficient communication and control. It supports voltage level translation between different bus voltages, such as 1.8 V, 2.5 V, 3.3 V, and 5 V, making it versatile for various applications.
Key Specifications
| Parameter | Value | Description |
|---|---|---|
| Number of Channels | 8 | Number of downstream I2C-bus channels |
| Interface | I2C, SMBus | Compatible with I2C and SMBus standards |
| Supply Voltage | 2.3 V to 5.5 V | Operating power supply voltage range |
| Clock Frequency | 0 Hz to 400 kHz | Supported clock frequency range |
| Package | 24-TSSOP (0.173, 4.40mm Width) | Package type and dimensions |
| Operating Temperature | -40°C to +85°C | Operating temperature range |
| ESD Protection | 2000 V HBM, 1000 V CDM | Electrostatic discharge protection levels |
| Reset Input | Active LOW | Type of reset input signal |
Key Features
- 1-of-8 bidirectional translating multiplexer
- I2C-bus interface logic compatible with SMBus standards
- Active LOW RESET input for recovering from bus fault conditions
- Three address pins allowing up to 8 devices on the I2C-bus
- Channel selection via I2C-bus, one channel at a time
- Power-up with all channels deselected except Channel 0 which is connected
- Low Ron multiplexers for minimal signal degradation
- 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
- 5 V tolerant inputs
Applications
The PCA9547PW,118 is suitable for a variety of applications where multiple I2C devices need to be managed efficiently. These include:
- Embedded systems requiring multiple I2C devices
- Industrial control systems with multiple sensors and actuators
- Automotive systems with various I2C-based peripherals
- Consumer electronics such as smart home devices and appliances
- Medical devices that require precise control over multiple I2C channels
Q & A
- What is the primary function of the PCA9547PW,118?
The PCA9547PW,118 is an 8-channel I2C-bus multiplexer that allows a single upstream I2C-bus to be fanned out to eight downstream channels.
- What are the supported voltage levels for the PCA9547PW,118?
The device supports voltage level translation between 1.8 V, 2.5 V, 3.3 V, and 5 V buses.
- How does the reset function work on the PCA9547PW,118?
The device has an active LOW RESET input that can be used to recover from bus fault conditions by resetting the I2C-bus state machine and deselecting all channels except Channel 0.
- What is the maximum clock frequency supported by the PCA9547PW,118?
The device supports clock frequencies up to 400 kHz.
- What package types are available for the PCA9547PW,118?
The device is available in 24-TSSOP (0.173, 4.40mm Width) packages.
- Is the PCA9547PW,118 RoHS compliant?
- What is the operating temperature range for the PCA9547PW,118?
The device operates within a temperature range of -40°C to +85°C.
- Does the PCA9547PW,118 support hot insertion?
- What is the ESD protection level for the PCA9547PW,118?
The device has ESD protection exceeding 2000 V HBM and 1000 V CDM.
- How many address pins does the PCA9547PW,118 have?
The device has three address pins, allowing up to 8 devices on the I2C-bus.
