Overview
The PCA9546APWRG4, produced by Texas Instruments, is a 4-channel I2C and SMBus switch designed to manage multiple I2C buses in a system. This component is part of the PCA9546A series and is packaged in a TSSOP (PW) package. It is particularly useful in applications where multiple I2C devices need to be connected to a single I2C bus, allowing for selective channel switching and voltage-level translation between different bus voltages.
Key Specifications
| Parameter | Description | Value |
|---|---|---|
| Number of Channels | Number of I2C channels | 4 |
| Operating Voltage Range | VCC supply voltage range | 2.3 V to 5.5 V |
| Input Voltage Tolerance | Input voltage tolerance | –0.5 V to 7 V |
| Clock Frequency | I2C clock frequency range | 0 kHz to 400 kHz |
| Address Pins | Number of address pins | 3 |
| Reset Input | Type of reset input | Active-low |
| Package Type | Package type | TSSOP (PW) |
| Thermal Resistance | Junction-to-ambient thermal resistance | 122.3 °C/W (TSSOP16 package) |
| ESD Protection | ESD protection level | 2000 V HBM, 1000 V CDM |
Key Features
- I2C Bus and SMBus Compatibility: Supports both Standard-Mode (100 kHz) and Fast-Mode (400 kHz) operation.
- Voltage-Level Translation: Allows communication between 1.8-V, 2.5-V, 3.3-V, and 5-V buses without additional protection.
- Active-Low Reset Input: Resets the I2C state machine and deselects all channels when asserted low.
- Low RON Switches: Low on-resistance switches for efficient data transfer.
- Hot Insertion Support: Supports hot insertion, allowing devices to be added or removed without disrupting the system.
- Low Standby Current: Low current consumption in standby mode.
- 5-V Tolerant Inputs: Inputs are tolerant up to 5.5 V.
Applications
- Multiplexing I2C Buses: Ideal for systems where multiple I2C devices need to share a single I2C bus, such as in industrial control systems, medical devices, and automotive electronics.
- Voltage Translation: Useful in mixed-voltage systems where devices with different voltage levels need to communicate over the I2C bus.
- Sensor Networks: Suitable for connecting multiple sensors to a single microcontroller or processor over the I2C bus.
- Embedded Systems: Can be used in various embedded systems to manage and switch between multiple I2C devices efficiently.
Q & A
- What is the PCA9546APWRG4 used for?
The PCA9546APWRG4 is used to manage multiple I2C buses in a system, allowing selective channel switching and voltage-level translation between different bus voltages.
- What is the operating voltage range of the PCA9546APWRG4?
The operating voltage range is from 2.3 V to 5.5 V.
- How many I2C channels does the PCA9546APWRG4 support?
The PCA9546APWRG4 supports 4 I2C channels.
- What is the purpose of the active-low reset input?
The active-low reset input resets the I2C state machine and deselects all channels when asserted low, helping to recover from bus fault conditions.
- Does the PCA9546APWRG4 support hot insertion?
Yes, it supports hot insertion, allowing devices to be added or removed without disrupting the system.
- What is the maximum clock frequency supported by the PCA9546APWRG4?
The maximum clock frequency supported is 400 kHz.
- How many address pins does the PCA9546APWRG4 have?
The PCA9546APWRG4 has three address pins, allowing up to eight devices to be used on the same I2C bus.
- What is the thermal resistance of the TSSOP (PW) package?
The junction-to-ambient thermal resistance for the TSSOP (PW) package is 122.3 °C/W.
- Does the PCA9546APWRG4 have ESD protection?
Yes, it has ESD protection exceeding 2000 V HBM and 1000 V CDM.
- What are some common applications of the PCA9546APWRG4?
Common applications include multiplexing I2C buses, voltage translation in mixed-voltage systems, sensor networks, and various embedded systems.
