Overview
The PCA9548A, produced by Texas Instruments, is a specialized integrated circuit designed to manage and switch I2C and SMBus communications. This device features eight bidirectional translating switches that can be controlled through the I2C bus, allowing for the resolution of I2C slave address conflicts. It is particularly useful in applications where multiple identical devices need to be connected to the same I2C bus. The PCA9548A supports voltage-level translation between different bus voltages, enabling communication between devices operating at different voltage levels without additional protection.
Key Specifications
| Parameter | Value |
|---|---|
| Package | TSSOP-24, SSOP-24, TVSOP-24, SOIC-24, VQFN-24 |
| 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 |
| RON Switches | Low RON |
| ESD Protection | 2000-V Human-Body Model, 200-V Machine Model, 1000-V Charged-Device Model |
| I/O Pins | 5-V Tolerant |
| Thermal Resistance (Junction-to-Ambient) | 89.1°C/W (TSSOP-24) |
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
- 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
- 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 PCA9548A used for?
The PCA9548A is used to manage and switch I2C and SMBus communications, particularly to resolve I2C slave address conflicts. - What are the key features of the PCA9548A?
Key features include 1-of-8 bidirectional translating switches, I2C and SMBus compatibility, active-low reset input, and voltage-level translation between different bus voltages. - What is the operating temperature range of the PCA9548A?
The operating temperature range is -40°C to 85°C. - What is the power-supply voltage range for the PCA9548A?
The operating power-supply voltage range is 2.3 V to 5.5 V. - Does the PCA9548A support hot insertion?
Yes, the PCA9548A supports hot insertion. - What is the clock frequency range for the PCA9548A?
The clock frequency range is 0 kHz to 400 kHz. - Is the PCA9548A ESD protected?
Yes, the PCA9548A has ESD protection exceeding JESD 22 standards. - Can the PCA9548A handle different bus voltages?
Yes, it allows voltage-level translation between 1.8-V, 2.5-V, 3.3-V, and 5-V buses. - What are some common applications of the PCA9548A?
Common applications include servers, routers, factory automation, and products with I2C slave address conflicts. - How many hardware address pins does the PCA9548A have?
The PCA9548A has three hardware address pins.
