Overview
The PCA9546APW,118, manufactured by NXP USA Inc., is a quad bidirectional translating switch controlled via the I²C-bus. This component is designed to fan out the SCL/SDA upstream pair to four downstream pairs or channels, allowing for flexible and efficient communication in I²C-bus systems. The device is particularly useful in applications where multiple I²C devices need to be connected to a single I²C bus, enabling the selection of any individual SCx/SDx channel or combination of channels through a programmable control register.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Number of Channels | 4 | |
| Bus Type | I²C, SMBus | |
| Supply Voltage Range | 2.3 to 5.5 | V |
| Operating Temperature Range | -40 to 85 | °C |
| Package Type | TSSOP16 | |
| Reset Input | Active LOW | |
| Power-On Reset (POR) | Yes | |
| ON-State Resistance | 4 to 9 Ω (VDD = 4.5 to 5.5 V) | Ω |
| Input/Output Capacitance | 3 to 5 pF | pF |
Key Features
- Quad Bidirectional Translating Switch: Allows the SCL/SDA upstream pair to fan out to four downstream pairs, enabling multiple I²C devices to be connected to a single I²C bus.
- Programmable Control Register: Enables the selection of any individual SCx/SDx channel or combination of channels.
- Active LOW Reset Input: Allows recovery from a situation where one of the downstream I²C-buses is stuck in a LOW state.
- Power-On Reset (POR): Holds the device in a reset condition until VDD has reached the specified voltage level.
- Low ON-State Resistance: Ensures minimal voltage drop across the switch, making it suitable for high-speed applications.
Applications
- Multiplexing I²C Devices: Ideal for systems where multiple I²C devices need to share a single I²C bus, such as in industrial control systems, consumer electronics, and automotive applications.
- Embedded Systems: Useful in embedded systems where space and component count need to be minimized while maintaining flexibility in I²C communication.
- Automotive and Industrial Automation: Suitable for applications requiring robust and reliable I²C communication in harsh environments.
Q & A
- What is the primary function of the PCA9546APW,118?
The primary function is to act as a quad bidirectional translating switch controlled via the I²C-bus, allowing the SCL/SDA upstream pair to fan out to four downstream pairs.
- What is the supply voltage range for the PCA9546APW,118?
The supply voltage range is from 2.3 to 5.5 volts.
- How does the reset input work on the PCA9546APW,118?
The reset input is an active LOW signal that can be used to recover from a bus fault condition by resetting the I²C-bus state machine and deselecting all channels.
- What is the purpose of the Power-On Reset (POR) in the PCA9546APW,118?
The POR holds the device in a reset condition until VDD has reached the specified voltage level, ensuring proper initialization.
- What is the typical ON-state resistance of the PCA9546APW,118?
The typical ON-state resistance is between 4 to 9 ohms when VDD is between 4.5 to 5.5 volts.
- What package type is the PCA9546APW,118 available in?
The PCA9546APW,118 is available in a TSSOP16 package.
- Can the PCA9546APW,118 be used in automotive applications?
Yes, it is suitable for automotive applications due to its robust and reliable performance in harsh environments.
- How does the programmable control register work in the PCA9546APW,118?
The programmable control register allows the selection of any individual SCx/SDx channel or combination of channels, enabling flexible control over the I²C communication.
- What is the input/output capacitance of the PCA9546APW,118?
The input/output capacitance is between 3 to 5 pF.
- Is the PCA9546APW,118 compatible with SMBus?
Yes, it is compatible with both I²C and SMBus protocols.
