Overview
The PCA9547PW,112 is an octal bidirectional translating multiplexer controlled by the I²C-bus, manufactured by NXP USA Inc. This device is designed to fan out the SCL/SDA upstream pair to eight downstream pairs or channels, allowing for flexible communication between multiple devices on the I²C-bus. It supports voltage level translation between different bus voltages, such as 1.8 V, 2.5 V, 3.3 V, and 5 V, without additional protection. The PCA9547PW,112 is particularly useful in systems where multiple I²C devices need to be connected to a single I²C-bus master, and it ensures smooth communication by allowing only one channel to be selected at a time.
Key Specifications
| Parameter | Description |
|---|---|
| Package Type | TSSOP24 (SOT355-1) |
| Operating Power Supply Voltage | 2.3 V to 5.5 V |
| Clock Frequency | 0 Hz to 400 kHz |
| ESD Protection | Exceeds 2000 V HBM per JESD22-A114 and 1000 V CDM per JESD22-C101 |
| Latch-up Testing | Exceeds 100 mA per JEDEC Standard JESD78 |
| Input Tolerance | 5 V tolerant inputs |
| Temperature Range | -40°C to +85°C |
| Address Pins | 3 address pins allowing up to 8 devices on the I²C-bus |
| Reset Input | Active LOW RESET input |
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 1.8 V, 2.5 V, 3.3 V, and 5 V buses
- No glitch on power-up
- Supports hot insertion
- Low standby current
Applications
The PCA9547PW,112 is suitable for various applications where multiple I²C devices need to be connected to a single I²C-bus master. This includes:
- Industrial automation systems
- Automotive systems requiring multiple sensor and actuator control
- Consumer electronics with multiple I²C peripherals
- Medical devices with multiple I²C interfaces
- Embedded systems requiring I²C bus expansion
Q & A
- What is the primary function of the PCA9547PW,112?
The PCA9547PW,112 is an octal bidirectional translating multiplexer that fans out the SCL/SDA upstream pair to eight downstream pairs or channels, controlled by the I²C-bus.
- What are the supported voltage levels for the PCA9547PW,112?
The device supports voltage level translation between 1.8 V, 2.5 V, 3.3 V, and 5 V buses.
- How many devices can be connected to the I²C-bus using the PCA9547PW,112?
Up to 8 devices can be connected to the I²C-bus using the 3 address pins.
- What is the purpose of the RESET input on the PCA9547PW,112?
The active LOW RESET input allows the device to recover from a situation where one of the downstream I²C-buses is stuck in a LOW state.
- What are the package options available for the PCA9547PW,112?
The PCA9547PW,112 is available in TSSOP24 (SOT355-1) package.
- What is the operating temperature range of the PCA9547PW,112?
The operating temperature range is -40°C to +85°C.
- Does the PCA9547PW,112 support hot insertion?
Yes, the PCA9547PW,112 supports hot insertion.
- What is the clock frequency range supported by the PCA9547PW,112?
The clock frequency range is 0 Hz to 400 kHz.
- What kind of ESD protection does the PCA9547PW,112 offer?
The device offers ESD protection exceeding 2000 V HBM per JESD22-A114 and 1000 V CDM per JESD22-C101.
- Is the PCA9547PW,112 compatible with SMBus standards?
Yes, the PCA9547PW,112 is compatible with SMBus standards.
