Overview
The PCA9546APW,112, produced by NXP USA Inc., is a quad bidirectional translating switch controlled via the I²C-bus. This device is designed to fan out the SCL/SDA upstream pair to four downstream pairs, or channels, allowing for flexible communication between multiple I²C slaves and a single I²C master. The PCA9546A is particularly useful in scenarios where multiple devices share the same I²C address or where voltage-level translation between different bus voltages is necessary.
Key Specifications
| Parameter | Value |
|---|---|
| Operating Power Supply Voltage | 2.3 V to 5.5 V |
| Input Voltage Tolerance | 5.5 V tolerant |
| Clock Frequency | 0 Hz to 400 kHz |
| ESD Protection | Exceeds 2000 V HBM (JESD22-A114), 1000 V CDM (JESD22-C101) |
| Latch-Up Performance | Exceeds 100 mA (JESD78) |
| Standby Current | Low standby current |
| Package Options | SO16, TSSOP16, HVQFN16 |
| Operating Temperature | -40°C to 85°C |
Key Features
- Quad bidirectional translating switches controlled via the I²C-bus
- I²C bus and SMBus compatible
- Active-low reset input to recover from bus fault conditions
- 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
- 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
Applications
- Servers
- Routers and telecom switching equipment
- Factory automation
- Products with I²C slave address conflicts (e.g., multiple identical temperature sensors)
Q & A
- What is the PCA9546APW,112 used for?
The PCA9546APW,112 is used as a quad bidirectional translating switch to manage multiple I²C slaves with a single I²C master, allowing for voltage-level translation and addressing conflicts resolution.
- What is the operating power supply voltage range of the PCA9546APW,112?
The operating power supply voltage range is from 2.3 V to 5.5 V.
- What is the clock frequency range supported by the PCA9546APW,112?
The clock frequency range is from 0 Hz to 400 kHz.
- Does the PCA9546APW,112 support hot insertion?
- How does the PCA9546APW,112 handle bus fault conditions?
The PCA9546APW,112 has an active-low reset input that can be used to recover from bus fault conditions by resetting the I²C state machine and deselecting all channels.
- What types of packages are available for the PCA9546APW,112?
The PCA9546APW,112 is available in SO16, TSSOP16, and HVQFN16 packages.
- What is the operating temperature range of the PCA9546APW,112?
The operating temperature range is from -40°C to 85°C.
- Does the PCA9546APW,112 provide ESD protection?
- Can multiple PCA9546A devices be used on the same I²C bus?
- What happens during power-up of the PCA9546APW,112?
During power-up, all switch channels are deselected, and the device is held in a reset condition until the power supply voltage reaches the power-on reset threshold.
