Overview
The PCA9548ADW, 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 channels, allowing for the resolution of slave address conflicts and the integration of devices with different voltage levels. The PCA9548ADW features eight bidirectional translating switches that can be controlled through the I2C bus, enabling the selection of individual or combined channels via the programmable control register. This component is particularly useful in applications where multiple identical devices need to be connected to the same I2C bus, such as in the case of multiple digital temperature sensors.
Key Specifications
| Parameter | Value |
|---|---|
| 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 |
| ESD Protection | 2000-V Human-Body Model, 200-V Machine Model, 1000-V Charged-Device Model |
| Mounting Type | Surface Mount |
| Interface | I2C, SMBus |
| Voltage Translation | Allows translation between 1.8-V, 2.5-V, 3.3-V, and 5-V buses |
Key Features
- 1-of-8 Bidirectional Translating Switches
- I2C Bus and SMBus Compatible
- Active-Low Reset Input
- Three Hardware Address Pins for up to Eight PCA9548A Devices on the I2C Bus
- Channel Selection Via I2C Bus
- Power-Up with All Switch Channels Deselected
- Low RON Switches
- No Glitch on Power Up
- Supports Hot Insertion
- Low Standby Current
- 5-V Tolerant Inputs
- Latch-Up Performance Exceeds 100 mA Per JESD 78, Class II
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 PCA9548ADW used for?
The PCA9548ADW is used to manage multiple I2C or SMBus channels, resolving slave address conflicts and enabling voltage translation between different bus voltages.
- How many channels does the PCA9548ADW support?
The PCA9548ADW supports eight bidirectional translating switches.
- What is the operating voltage range of the PCA9548ADW?
The operating power-supply voltage range is from 2.3 V to 5.5 V.
- Is the PCA9548ADW compatible with both I2C and SMBus?
Yes, the PCA9548ADW is compatible with both I2C and SMBus.
- How does the reset function work on the PCA9548ADW?
The PCA9548ADW has an active-low reset input. Asserting the RESET input causes all channels to be deselected and initializes the I2C/SMBus state machine without powering down the part.
- What types of devices can benefit from using the PCA9548ADW?
Devices that require multiple identical I2C or SMBus devices, such as multiple digital temperature sensors, can benefit from using the PCA9548ADW.
- Does the PCA9548ADW support hot insertion?
Yes, the PCA9548ADW supports hot insertion.
- What is the clock frequency range of the PCA9548ADW?
The clock frequency range is from 0 kHz to 400 kHz.
- Is the PCA9548ADW ESD protected?
Yes, the PCA9548ADW has ESD protection exceeding 2000-V Human-Body Model, 200-V Machine Model, and 1000-V Charged-Device Model.
- What package types are available for the PCA9548ADW?
The PCA9548ADW is available in several package types, including SOIC (24 pins), SSOP (24 pins), TVSOP (24 pins), TSSOP (24 pins), and VQFN (24 pins).
