Overview
The PCA9540BGD,125 is a 2-channel I²C-bus multiplexer produced by NXP USA Inc. This device is designed to control and switch between two downstream I²C-bus channels, allowing for the expansion of the I²C-bus in various applications. The PCA9540B is a bidirectional translating multiplexer, meaning it can handle both input and output signals and translate them between different voltage levels.
The device is controlled via the I²C-bus and features a programmable control register that determines which downstream channel is selected. It also includes a power-on reset function that initializes the device to its default state upon power-up.
Key Specifications
| Parameter | Conditions | Typical Value | Unit |
|---|---|---|---|
| VDD Supply Voltage | Operating Mode | 2.3 to 5.5 | V |
| IDD Supply Current | VDD = 5.5 V, No Load, fSCL = 100 kHz | 65 to 100 | μA |
| Istb Standby Current | VDD = 5.5 V, No Load | 0.3 to 1 | μA |
| VPOR Power-On Reset Voltage | No Load | 1.6 to 2.1 | V |
| VIL Low-Level Input Voltage | SCL/SDA Inputs | -0.5 to +0.3VDD | V |
| Package Type | XSON8U | - | - |
| Operating Temperature Range | -40 to +85 | - | °C |
Key Features
- Bidirectional Translating Multiplexer: Allows for voltage translation between different bus voltages, enabling communication between 1.8 V, 2.5 V, 3.3 V, and 5 V parts without additional protection.
- Programmable Control Register: Determines which of the two downstream I²C-bus channels is selected.
- Power-On Reset: Initializes the device to its default state upon power-up, ensuring all channels are deselected.
- Low Power Consumption: Operates in both active and standby modes to minimize power usage.
- Compact Package: Available in XSON8U package, which is extremely thin and small, making it suitable for space-constrained designs.
Applications
- Embedded Systems: Ideal for expanding the I²C-bus in microcontroller-based systems, allowing more devices to be connected.
- Industrial Automation: Used in industrial control systems where multiple sensors and actuators need to be managed over the I²C-bus.
- Consumer Electronics: Suitable for use in consumer devices such as smartphones, tablets, and other portable electronics where I²C-bus expansion is necessary.
- Automotive Systems: Can be used in automotive systems for managing various sensors and control units over the I²C-bus.
Q & A
- What is the primary function of the PCA9540BGD,125?
The PCA9540BGD,125 is a 2-channel I²C-bus multiplexer that allows for the expansion of the I²C-bus by controlling and switching between two downstream channels.
- What are the supported voltage levels for the PCA9540BGD,125?
The device supports voltage levels from 2.3 V to 5.5 V and can translate between different bus voltages such as 1.8 V, 2.5 V, 3.3 V, and 5 V.
- How is the PCA9540BGD,125 controlled?
The device is controlled via the I²C-bus and features a programmable control register to select which downstream channel is active.
- What is the purpose of the power-on reset function?
The power-on reset function initializes the device to its default state upon power-up, ensuring all channels are deselected.
- What package types are available for the PCA9540BGD,125?
The PCA9540BGD,125 is available in the XSON8U package, which is extremely thin and small.
- What are the typical operating conditions for the PCA9540BGD,125?
The device operates within a temperature range of -40°C to +85°C.
- How does the PCA9540BGD,125 manage power consumption?
The device operates in both active and standby modes to minimize power usage.
- What are some common applications for the PCA9540BGD,125?
Common applications include embedded systems, industrial automation, consumer electronics, and automotive systems.
- Can the PCA9540BGD,125 be used in mixed-voltage systems?
Yes, the device can be used in mixed-voltage systems due to its voltage translation capabilities.
- Where can I find design files and symbols for the PCA9540BGD,125?
Design files, symbols, and footprints are available on the NXP Semiconductors website and other authorized distributors.
