Overview
The PCA9540BDP/Q900J, produced by NXP USA Inc., is a 2-channel I2C-bus multiplexer designed to control and manage multiple I2C-bus channels. This device is particularly useful in systems where multiple I2C devices share the same bus, allowing for the selection of one of two downstream channels. The PCA9540B is controlled via the I2C-bus and features bidirectional translating capabilities, enabling communication between devices operating at different voltage levels (1.8 V, 2.5 V, 3.3 V, and 5 V) without additional protection.
Key Specifications
| Parameter | Conditions | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| VDD supply voltage | Operating mode | 2.3 | - | 5.5 | V |
| IDD supply current | VDD = 3.6 V, no load, fSCL = 100 kHz | - | 50 | 100 | μA |
| Istb standby current | VDD = 3.6 V, no load, fSCL = 0 kHz | - | 0.1 | 1 | μA |
| VPOR power-on reset voltage | No load; VI = VDD or VSS | 1.6 | - | 2.1 | V |
| VIL LOW-level input voltage | - | -0.5 | - | 0.3VDD | V |
| VIH HIGH-level input voltage | - | 0.7VDD | - | 6 | V |
| Package options | - | - | - | SO8, TSSOP8, XSON8 | - |
Key Features
- Bidirectional Translating Multiplexer: Allows communication between I2C devices operating at different voltage levels (1.8 V, 2.5 V, 3.3 V, and 5 V).
- Power-On Reset (POR): Initializes the device to a default state with all channels deselected upon power-up.
- Voltage Translation: The pass gate transistors are designed to limit the maximum high voltage passed by the device, enabling voltage translation.
- Low Power Consumption: Operates in both active and standby modes with low current consumption.
- Multiple Package Options: Available in SO8, TSSOP8, and XSON8 packages.
- AEC-Q100 Compliance: The PCA9540BDP/Q900J is AEC-Q100 compliant, suitable for automotive applications.
Applications
- Automotive Systems: Suitable for use in automotive environments due to its AEC-Q100 compliance.
- Industrial Automation: Useful in systems requiring multiple I2C devices to share the same bus.
- Consumer Electronics: Ideal for devices that need to manage multiple I2C interfaces, such as smart home devices and IoT applications.
- Medical Devices: Can be used in medical equipment that requires reliable and efficient I2C bus management.
Q & A
- What is the PCA9540BDP/Q900J used for?
The PCA9540BDP/Q900J is a 2-channel I2C-bus multiplexer used to control and manage multiple I2C-bus channels, allowing communication between devices operating at different voltage levels.
- What are the supported voltage levels for the PCA9540BDP/Q900J?
The device supports voltage levels of 1.8 V, 2.5 V, 3.3 V, and 5 V.
- What is the purpose of the Power-On Reset (POR) feature?
The Power-On Reset (POR) feature initializes the device to a default state with all channels deselected upon power-up.
- What are the package options available for the PCA9540BDP/Q900J?
The device is available in SO8, TSSOP8, and XSON8 packages.
- Is the PCA9540BDP/Q900J AEC-Q100 compliant?
Yes, the PCA9540BDP/Q900J is AEC-Q100 compliant, making it suitable for automotive applications.
- What is the typical supply current for the PCA9540BDP/Q900J in operating mode?
The typical supply current in operating mode is 50 μA at VDD = 3.6 V and fSCL = 100 kHz.
- What is the standby current for the PCA9540BDP/Q900J?
The standby current is typically 0.1 μA at VDD = 3.6 V and fSCL = 0 kHz.
- How does the PCA9540BDP/Q900J handle voltage translation?
The pass gate transistors are designed to limit the maximum high voltage passed by the device, enabling voltage translation between different bus voltages.
- What are some common applications of the PCA9540BDP/Q900J?
Common applications include automotive systems, industrial automation, consumer electronics, and medical devices.
- How do I reset the PCA9540BDP/Q900J?
To reset the device, VDD must be lowered to 0.2 V for at least 5 μs.
