Overview
The PCA9548APW,112, produced by NXP USA Inc., is an octal bidirectional translating switch controlled via the I²C-bus. This device is part of the PCA9548A series and is designed to fan out the SCL/SDA upstream pair to eight downstream pairs or channels. It allows for the selection of any individual SCx/SDx channel or combination of channels through the programmable control register. The PCA9548A is particularly useful in resolving I²C slave address conflicts and supports voltage-level translation between different bus voltages.
Key Specifications
| Parameter | Conditions | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| VDD supply voltage | -0.5 | 7.0 | V | ||
| VI input voltage | -0.5 | 7.0 | V | ||
| Operating power supply voltage range | 2.3 | 5.5 | V | ||
| Input current | -20 | 20 | mA | ||
| Output current | -25 | 25 | mA | ||
| Maximum junction temperature | 125 | °C | |||
| Ambient temperature (operating) | -40 | 85 | °C | ||
| Storage temperature | -60 | 150 | °C | ||
| Clock frequency | 0 | 400 | kHz | ||
| ESD protection | Human-Body Model (HBM) | 2000 | V | ||
| ESD protection | Charged-Device Model (CDM) | 1000 | V |
Key Features
- 1-of-8 bidirectional translating switches controlled via the I²C-bus
- I²C bus and SMBus compatible
- Active-low reset input to recover from stuck I²C-bus states
- 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
- Low RON switches for minimal voltage drop
- 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
- 6 V tolerant inputs
- ESD protection exceeds 2000 V HBM and 1000 V CDM
- Latch-up testing exceeds 100 mA per JESD78
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 primary function of the PCA9548APW,112?
The PCA9548APW,112 is an octal bidirectional translating switch controlled via the I²C-bus, designed to fan out the SCL/SDA upstream pair to eight downstream pairs or channels.
- What is the operating power supply voltage range of the PCA9548APW,112?
The operating power supply voltage range is from 2.3 V to 5.5 V.
- How many hardware address pins does the PCA9548APW,112 have?
The device has three hardware address pins, allowing up to eight PCA9548A devices to be used on the I²C bus.
- What is the purpose of the active-low reset input?
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.
- What is the maximum clock frequency supported by the PCA9548APW,112?
The device supports clock frequencies from 0 kHz to 400 kHz.
- Does the PCA9548APW,112 support voltage-level translation?
Yes, it supports voltage-level translation between 1.8-V, 2.5-V, 3.3-V, and 5-V buses.
- What is the maximum junction temperature for the PCA9548APW,112?
The maximum junction temperature should not exceed 125°C.
- What types of ESD protection does the PCA9548APW,112 have?
The device has ESD protection that exceeds 2000 V HBM and 1000 V CDM.
- What are some common applications for the PCA9548APW,112?
Common applications include servers, routers, factory automation, and products with I²C slave address conflicts.
- Does the PCA9548APW,112 support hot insertion?
Yes, the device supports hot insertion.
