Overview
The TCA9546APWR, produced by Texas Instruments, is a 4-channel, bidirectional translating switch designed for I2C and SMBus applications. This device allows a single I2C bus to be expanded into four separate channels, enabling communication with multiple I2C slaves from a single master. The TCA9546A supports voltage-level translation between different bus voltages, such as 1.8-V, 2.5-V, 3.3-V, and 5-V, making it versatile for various system configurations. It also features an active-low reset input and internal power-on reset functionality to manage and recover from fault conditions on the I2C bus.
Key Specifications
| Parameter | Value |
|---|---|
| Package | TSSOP (PW) with 16 pins |
| Operating Temperature Range | -40°C to 85°C |
| Operating Power-Supply Voltage Range | 1.65 V to 5.5 V |
| Clock Frequency | 0 to 400 kHz |
| Input Tolerance | 5.5 V tolerant inputs |
| ESD Protection | 4000-V Human-body model, 1500-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 TCA9546A devices on the I2C bus
- Channel selection via I2C Bus, in any combination
- 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 TCA9546APWR is suitable for a variety of applications where multiple I2C devices need to be connected to a single I2C master. This includes industrial automation, medical devices, consumer electronics, and automotive systems. It is particularly useful in scenarios where different voltage levels are present and need to be translated, ensuring seamless communication between devices operating at different voltages.
Q & A
- What is the primary function of the TCA9546APWR?
The primary function of the TCA9546APWR is to act as a 4-channel, bidirectional translating switch for I2C and SMBus applications, allowing a single I2C bus to be expanded into four separate channels. - What is the operating voltage range of the TCA9546APWR?
The operating power-supply voltage range of the TCA9546APWR is from 1.65 V to 5.5 V. - What is the maximum clock frequency supported by the TCA9546APWR?
The TCA9546APWR supports clock frequencies up to 400 kHz. - Does the TCA9546APWR support voltage-level translation?
Yes, the TCA9546APWR supports voltage-level translation between 1.8-V, 2.5-V, 3.3-V, and 5-V buses. - What is the purpose of the active-low reset input on the TCA9546APWR?
The active-low reset input allows the device to recover from a situation where one of the downstream I2C buses is stuck in a low state. - How many TCA9546A devices can be connected on a single I2C bus?
Up to eight TCA9546A devices can be connected on a single I2C bus using the three address pins. - Is the TCA9546APWR tolerant to high input voltages?
Yes, the TCA9546APWR has 5.5 V tolerant inputs. - What is the ESD protection level of the TCA9546APWR?
The TCA9546APWR has ESD protection exceeding 4000-V Human-body model and 1500-V Charged-device model. - Does the TCA9546APWR support hot insertion?
Yes, the TCA9546APWR supports hot insertion. - What is the typical application of the TCA9546APWR?
The TCA9546APWR is typically used in applications such as industrial automation, medical devices, consumer electronics, and automotive systems where multiple I2C devices need to be connected to a single I2C master.
