Overview
The PCA9547D,112, produced by NXP USA Inc., is an 8-channel I2C-bus multiplexer designed to manage multiple I2C-bus devices in a system. This component allows a single I2C-bus master to communicate with up to eight downstream I2C-bus devices, each connected to a separate channel. The PCA9547 is particularly useful in applications where multiple devices share the same I2C-bus address or where the system requires the ability to isolate and communicate with individual devices independently.
Key Specifications
| Parameter | Value |
|---|---|
| Number of Channels | 8 |
| Interface | I2C-bus, SMBus compatible |
| Supply Voltage Range | 2.3 V to 5.5 V |
| Clock Frequency Range | 0 Hz to 400 kHz |
| Address Pins | 3 (allowing up to 8 devices on the I2C-bus) |
| Reset Input | Active LOW |
| Package Options | SO24, TSSOP24, HVQFN24 |
| Voltage Level Translation | Between 1.8 V, 2.5 V, 3.3 V, and 5 V buses |
| ESD Protection | Exceeds 2000 V HBM per JESD22-A114 and 1000 V CDM per JESD22-C101 |
Key Features
- 1-of-8 bidirectional translating multiplexer
- I2C-bus interface logic; compatible with SMBus standards
- Active LOW RESET input to recover from bus fault conditions
- 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 voltage drop
- Allows voltage level translation between different bus voltages
- No glitch on power-up
- Supports hot insertion
- Low standby current
- 5 V tolerant inputs
Applications
The PCA9547D,112 is suitable for various applications where multiple I2C-bus devices need to be managed efficiently. These include:
- Industrial automation systems
- Automotive systems requiring multiple sensor and actuator control
- Consumer electronics with multiple I2C-bus peripherals
- Medical devices with multiple sensors and actuators
- Any system requiring the isolation and independent control of multiple I2C-bus devices
Q & A
- What is the PCA9547D,112 used for?
The PCA9547D,112 is used as an 8-channel I2C-bus multiplexer to manage multiple I2C-bus devices in a system. - How many channels does the PCA9547D,112 support?
The PCA9547D,112 supports 8 channels. - What is the supply voltage range for the PCA9547D,112?
The supply voltage range is from 2.3 V to 5.5 V. - Is the PCA9547D,112 compatible with SMBus standards?
Yes, it is compatible with SMBus standards. - How is channel selection done on the PCA9547D,112?
Channel selection is done via the I2C-bus, with one channel selected at a time. - What is the purpose of the RESET input on the PCA9547D,112?
The RESET input is used to recover from bus fault conditions by resetting the I2C-bus state machine. - Does the PCA9547D,112 support voltage level translation?
Yes, it supports voltage level translation between 1.8 V, 2.5 V, 3.3 V, and 5 V buses. - What are the package options available for the PCA9547D,112?
The package options include SO24, TSSOP24, and HVQFN24. - Is the PCA9547D,112 tolerant to 5 V inputs?
Yes, it is 5 V tolerant. - What is the clock frequency range supported by the PCA9547D,112?
The clock frequency range is from 0 Hz to 400 kHz.
