Overview
The PCA9546ADWR, produced by Texas Instruments, is a quad bidirectional translating switch designed for use with I2C and SMBus systems. This component allows the fan-out of a single I2C/SMBus upstream pair to four downstream pairs or channels, enabling multiple devices to be connected to the same bus. The PCA9546A is particularly useful in applications where different voltage levels need to be translated between various devices on the bus.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Package | TSSOP (PW), SOIC (D), TVSOP (DGV) | - |
| Pins | 16 | - |
| Operating Temperature Range | -40 to 85 | °C |
| Operating Power-Supply Voltage Range | 2.3 to 5.5 | V |
| Input Voltage Tolerance | 5.5 | V |
| Clock Frequency | 0 to 400 kHz | - |
| Standby Current | Low | - |
| ESD Protection | 2000-V Human-Body Model, 1000-V Charged-Device Model | - |
| Latch-Up Performance | Exceeds 100 mA per JESD 78 | - |
Key Features
- 1-of-4 Bidirectional Translating Switches
- I2C Bus and SMBus Compatible
- Active-Low Reset Input
- Three Address Pins, allowing up to eight PCA9546A devices on the I2C bus
- Channel Selection Via I2C Bus, in any combination
- 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
- 5.5 V Tolerant inputs
Applications
The PCA9546ADWR is suitable for a variety of applications where multiple I2C or SMBus devices need to be connected to a single bus. This includes:
- Embedded systems requiring multiple I2C devices
- Industrial control systems with diverse voltage requirements
- Automotive systems needing robust I2C bus management
- Consumer electronics with multiple I2C-compatible components
- Medical devices requiring reliable and flexible I2C communication
Q & A
- What is the primary function of the PCA9546ADWR?
The PCA9546ADWR is a quad bidirectional translating switch that allows the fan-out of a single I2C/SMBus upstream pair to four downstream pairs or channels.
- What are the supported voltage levels for the PCA9546ADWR?
The PCA9546ADWR supports voltage-level translation between 1.8-V, 2.5-V, 3.3-V, and 5-V buses.
- What is the maximum clock frequency supported by the PCA9546ADWR?
The PCA9546ADWR supports clock frequencies up to 400 kHz.
- Does the PCA9546ADWR support hot insertion?
- How many PCA9546A devices can be connected on the same I2C bus?
Up to eight PCA9546A devices can be connected on the same I2C bus using the three address pins.
- What is the purpose of the active-low reset input?
The active-low reset input allows the PCA9546A to recover from a situation where one of the downstream I2C buses is stuck in a low state.
- What is the operating temperature range of the PCA9546ADWR?
The operating temperature range is -40°C to 85°C.
- Is the PCA9546ADWR ESD protected?
- What is the standby current of the PCA9546ADWR?
The PCA9546ADWR has a low standby current.
- Are the I/O pins of the PCA9546ADWR voltage tolerant?
