Overview
The PCA9548ADWG4, produced by Texas Instruments, is an 8-channel I2C/SMBus switch with reset and voltage translation capabilities. This device is designed to manage multiple I2C or SMBus devices on a single bus, resolving potential address conflicts and enabling communication between devices operating at different voltage levels. The PCA9548A features bidirectional translating switches that can be controlled via the I2C bus, allowing for flexible and efficient management of multiple downstream channels.
Key Specifications
| Specification | Value |
|---|---|
| Package | SOIC (DW) with 24 pins |
| Operating Temperature Range | -40°C to 85°C |
| Operating Power-Supply Voltage Range | 2.3 V to 5.5 V |
| Clock Frequency | 0 kHz to 400 kHz |
| I/O Pin Tolerance | 5-V tolerant |
| Thermal Resistance (Junction-to-Ambient) | 73.2 °C/W (SOIC) |
| ESD Protection | 2000-V Human-Body Model, 200-V Machine Model, 1000-V Charged-Device Model |
Key Features
The PCA9548ADWG4 includes several key features:
- 1-of-8 bidirectional translating switches
- I2C bus and SMBus compatibility
- Active-low reset input
- Three hardware address pins for using up to eight PCA9548A devices on the I2C bus
- Channel selection via I2C bus
- 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 PCA9548ADWG4 is suitable for various applications where multiple I2C or SMBus devices need to be managed on a single bus. This includes:
- Resolving I2C slave address conflicts in systems with multiple identical devices
- Enabling communication between devices operating at different voltage levels
- Industrial automation and control systems
- Consumer electronics requiring multiple sensor or peripheral connections
- Automotive systems with multiple I2C devices
Q & A
- What is the primary function of the PCA9548ADWG4?
The PCA9548ADWG4 is an 8-channel I2C/SMBus switch that allows for the management of multiple I2C or SMBus devices on a single bus, enabling voltage-level translation and resolving address conflicts. - What is the operating voltage range of the PCA9548ADWG4?
The operating power-supply voltage range is from 2.3 V to 5.5 V. - How many hardware address pins does the PCA9548ADWG4 have?
The device has three hardware address pins, allowing up to eight PCA9548A devices to be used on the same I2C bus. - What is the maximum clock frequency supported by the PCA9548ADWG4?
The device supports clock frequencies from 0 kHz to 400 kHz. - Is the PCA9548ADWG4 tolerant to 5-V inputs?
Yes, all I/O pins of the PCA9548ADWG4 are 5-V tolerant. - What is the thermal resistance (junction-to-ambient) for the SOIC package?
The thermal resistance (junction-to-ambient) for the SOIC package is 73.2 °C/W. - Does the PCA9548ADWG4 support hot insertion?
Yes, the device supports hot insertion. - How does the PCA9548ADWG4 handle power-up?
The device power-ups with all switch channels deselected. - What is the purpose of the active-low reset input on the PCA9548ADWG4?
The active-low reset input allows the system master to reset the device in case of a time-out or other improper operation. - What kind of ESD protection does the PCA9548ADWG4 offer?
The device offers ESD protection exceeding 2000-V Human-Body Model, 200-V Machine Model, and 1000-V Charged-Device Model.
