Overview
The TCA9548APWR is a low-voltage 8-channel I2C switch produced by Texas Instruments. This device features bidirectional translating switches that can be controlled through the I2C bus, making it ideal for resolving I2C target address conflicts and enabling communication between devices with different voltage levels. The TCA9548APWR supports voltage-level translation between 1.8V, 2.5V, 3.3V, and 5V buses, and it includes an active-low reset input for recovering from improper operation or stuck I2C buses.
Key Specifications
| Specification | Value |
|---|---|
| Number of Channels | 8 |
| I2C Bus Compatibility | I2C Bus and SMBus compatible |
| Reset Input | Active-low reset input |
| Address Pins | Three address pins (A0, A1, A2) |
| Channel Selection | Through I2C Bus, in any combination |
| Power-Up State | All switch channels deselected |
| RON Switches | Low RON switches |
| Voltage Translation | Between 1.8V, 2.5V, 3.3V, and 5V buses |
| Power-Up Glitch | No glitch on power up |
| Hot Insertion | Supported |
| Standby Current | Low standby current |
| Operating Voltage Range | 1.65V to 5.5V |
| Input Tolerance | 5-V Tolerant inputs |
| Clock Frequency | 0 to 400kHz |
| Latch-Up Performance | Exceeds 100mA Per JESD 78, class II |
| ESD Protection | ±2000V Human-body model, 200V Machine model, ±1000V Charged-device model |
| Package Options | TSSOP-24, VQFN-24, VSSOP-24 |
| Operating Temperature Range | -40°C to 85°C |
Key Features
- 1-to-8 bidirectional translating switches
- I2C Bus and SMBus compatible
- Active-low reset input for recovery from improper operation or stuck I2C buses
- Three address pins allowing up to eight TCA9548A devices on the I2C bus
- Channel selection through the I2C Bus in any combination
- Power up with all switch channels deselected
- Low RON switches
- Voltage-level translation between 1.8V, 2.5V, 3.3V, and 5V buses
- No glitch on power up
- Supports hot insertion
- Low standby current
- Operating power-supply voltage range of 1.65V to 5.5V
- 5-V Tolerant inputs
- 0 to 400kHz Clock frequency
- Latch-up performance exceeds 100mA Per JESD 78, class II
- ESD Protection exceeds JESD 22 standards
Applications
The TCA9548APWR is versatile and can be used in various applications, including:
- Servers and data centers to manage multiple I2C devices efficiently.
- Routers and telecom switching equipment to resolve address conflicts.
- Factory Automation systems where multiple sensors and actuators need to be controlled.
- Products with I2C target address conflicts, such as multiple identical temperature sensors.
Q & A
- What is the primary function of the TCA9548APWR?
The TCA9548APWR is an 8-channel I2C switch that allows multiple I2C devices to share the same I2C bus, resolving address conflicts and enabling voltage-level translation between different bus voltages.
- How many channels does the TCA9548APWR support?
The TCA9548APWR supports 8 bidirectional translating channels.
- What is the operating voltage range of the TCA9548APWR?
The operating power-supply voltage range is from 1.65V to 5.5V.
- Is the TCA9548APWR compatible with SMBus?
Yes, the TCA9548APWR is both I2C Bus and SMBus compatible.
- How does the reset function work on the TCA9548APWR?
The TCA9548APWR has an active-low reset input that resets the state machine and allows recovery if one of the downstream I2C buses gets stuck in a low state. It also supports power-on reset (POR) by cycling the power supply.
- What is the purpose of the three address pins on the TCA9548APWR?
The three address pins (A0, A1, A2) allow up to eight TCA9548A devices to be connected on the same I2C bus.
- Can the TCA9548APWR support hot insertion?
Yes, the TCA9548APWR supports hot insertion.
- What is the clock frequency range supported by the TCA9548APWR?
The clock frequency range is from 0 to 400kHz.
- Does the TCA9548APWR have ESD protection?
Yes, the TCA9548APWR has ESD protection that exceeds JESD 22 standards.
- What are the typical applications of the TCA9548APWR?
The TCA9548APWR is used in servers, routers, factory automation, and products with I2C target address conflicts.
- How does the voltage-level translation work on the TCA9548APWR?
The TCA9548APWR allows voltage-level translation between 1.8V, 2.5V, 3.3V, and 5V buses using external pull-up resistors to adjust the bus voltage for each channel.
