Overview
The PCA9546APWT, produced by Texas Instruments, is a specialized interface IC designed as a 4-channel, bidirectional translating switch for I2C and SMBus applications. This device is particularly useful in systems where multiple I2C or SMBus devices need to be connected to a single bus, allowing for flexible channel selection and voltage-level translation. The PCA9546A supports both Standard-Mode (100 kHz) and Fast-Mode (400 kHz) operation, making it versatile for various system designs.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Supply Voltage Range | 2.3 to 5.5 | V |
| Operating Temperature Range | -40 to 85 | °C |
| Number of Channels | 4 | - |
| Package Type | 16-TSSOP (0.173, 4.40mm Width) | - |
| Number of Pins | 16 | - |
| Clock Frequency Range | 0 to 400 kHz | - |
| Input Voltage Tolerance | Up to 5.5 V | V |
| Standby Current | Low | - |
| Voltage-Level Translation | Between 1.8-V, 2.5-V, 3.3-V, and 5-V buses | - |
Key Features
- 1-of-4 bidirectional translating switches for I2C and SMBus buses
- I2C bus and SMBus compatible
- Active-low reset input
- Three address pins allowing up to eight PCA9546A devices on the I2C bus
- Channel selection via I2C bus in any combination
- Power-up with all switch channels deselected
- Low RON switches
- 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 PCA9546APWT is suitable for a variety of applications where multiple I2C or SMBus devices need to be managed. These include:
- Embedded systems requiring multiple I2C or SMBus peripherals
- Industrial control systems with multiple sensors and actuators
- Automotive systems with various I2C-compatible components
- Consumer electronics such as smart home devices and appliances
- Medical devices requiring multiple I2C interfaces
Q & A
- What is the primary function of the PCA9546APWT?
The PCA9546APWT is a 4-channel, bidirectional translating switch for I2C and SMBus buses, allowing for the connection and management of multiple devices on a single bus.
- What is the operating voltage range of the PCA9546APWT?
The operating voltage range is from 2.3 V to 5.5 V.
- How many channels does the PCA9546APWT support?
The device supports 4 channels.
- What is the maximum clock frequency supported by the PCA9546APWT?
The device supports clock frequencies up to 400 kHz.
- Does the PCA9546APWT support voltage-level translation?
- What is the effect of the active-low reset input on the PCA9546APWT?
- Can multiple PCA9546APWT devices be used on the same I2C bus?
- Does the PCA9546APWT support hot insertion?
- What is the standby current of the PCA9546APWT?
The device has a low standby current.
- What package type is the PCA9546APWT available in?
The device is available in a 16-TSSOP package.
