Overview
The PCA9548ADWR, produced by Texas Instruments, is a low-voltage 8-channel I2C switch with reset functionality. This device is designed to manage and switch between multiple I2C or SMBus channels, making it ideal for applications where multiple devices share the same bus and may have address conflicts. The PCA9548ADWR features eight bidirectional translating switches that can be controlled via the I2C bus, allowing for flexible channel selection and voltage-level translation between different bus voltages.
Key Specifications
| Parameter | Description |
|---|---|
| Package | 24-SOIC (0.295", 7.50mm Width) |
| Pins | 24 |
| 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 |
| Switch-On Resistance (RON) | 4 Ω to 45 Ω (depending on VCC and IO) |
| ESD Protection | 2000-V Human-Body Model, 200-V Machine Model, 1000-V Charged-Device Model |
| Latch-Up Performance | Exceeds 100 mA per JESD 78, Class II |
| Input Tolerance | 5-V tolerant inputs |
Key Features
- 1-of-8 bidirectional translating switches
- I2C bus and SMBus compatible
- Active-low reset input
- Three hardware address pins for use of up to eight PCA9548A devices on the I2C bus
- Channel selection via I2C bus
- Power-up with all switch channels deselected
- Low RON switches
- 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
- 5-V tolerant inputs
Applications
- Servers
- Routers (Telecom Switching Equipment)
- Factory Automation
- Products with I2C slave address conflicts (e.g., multiple identical temperature sensors)
Q & A
- What is the PCA9548ADWR used for?
The PCA9548ADWR is used to manage and switch between multiple I2C or SMBus channels, resolving address conflicts and allowing different bus voltages to communicate.
- What is the operating temperature range of the PCA9548ADWR?
The operating temperature range is -40°C to 85°C.
- What is the power-supply voltage range for the PCA9548ADWR?
The operating power-supply voltage range is 2.3 V to 5.5 V.
- How many channels does the PCA9548ADWR support?
The device supports eight bidirectional translating switches.
- Is the PCA9548ADWR compatible with both I2C and SMBus?
- What is the purpose of the active-low reset input?
The active-low reset input allows the system master to reset the PCA9548ADWR in case of a time-out or other improper operation.
- Can the PCA9548ADWR handle different bus voltages?
- Does the PCA9548ADWR support hot insertion?
- What is the clock frequency range for the PCA9548ADWR?
The clock frequency range is 0 kHz to 400 kHz.
- What kind of ESD protection does the PCA9548ADWR have?
The device has ESD protection exceeding 2000-V Human-Body Model, 200-V Machine Model, and 1000-V Charged-Device Model.
