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Name: PCA9544APW
Brand: Texas Instruments
SKU: PCA9544APW
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Any Feature, including a modified Existing Feature, that is not an Existing Feature.

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Texas Instruments PCA9544APW

Part No.:: PCA9544APW

Manufacturer:: Texas Instruments

Package:: 20-TSSOP (0.173, 4.40mm Width)

Datasheet:: PCA9544APW.pdf

Description:: IC INTERFACE SPECIALIZED 20TSSOP

In Stock:: 14249

Quantity:: Add To Cart

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PCA9544APW Specifications

Package/Case:
20-TSSOP (0.173, 4.40mm Width)
Packaging:
Bulk,Tube
Series:
-
ProductStatus:
Obsolete
Applications:
Translating Switch
Interface:
I²C, SMBus
Voltage-Supply:
2.3V ~ 5.5V

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PCA9544APW information

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PCA9544APW Typical application Circuitry

PCA9544APW

The PCA9544APW is a 4-channel I2C-bus multiplexer with interrupt logic. This chip allows a single I2C master to interface with multiple I2C devices (slaves) that have the same address, by providing channel selection through an I2C-bus interface.

PCA9544APW Application Scenarios:

1. I2C Bus System Expansion: Widely used in systems where multiple I2C devices with the same address need to be connected to a single I2C master, such as in complex embedded systems, multi-sensor applications, or server motherboards.

2. Managing Multiple I2C Devices: Ideal for applications that require communication with multiple I2C devices, like sensors or EEPROMs, in a controlled and organized manner.

PCA9544APW Key Features and Parameters:

1. 4-Channel Multiplexer: Offers four distinct I2C-bus channels for multiplexing.

2. I2C-Bus Interface: Compatible with the I2C-bus standard, facilitating easy integration into I2C systems.

3. Interrupt Logic: Supports interrupt logic, enhancing the efficiency of the system's I2C-bus communication.

4. Wide Operating Voltage Range: Typically operates within a 2.3V to 5.5V range, accommodating various logic levels.

5. Low Standby Current: Designed to have a low standby current, contributing to energy efficiency.

Circuit Connection Example: Managing Multiple I2C Sensors

Overview: Implementing PCA9544APW in a system to interface a single I2C master with multiple I2C sensors having the same address.

1. Power Supply Connection: VCC (pin 16) should be connected to the system's power supply, typically within the 2.3V to 5.5V range.

2. Grounding the Chip: GND (pin 8) needs to be connected to the system's ground.

3. I2C Master Connection: SDA (pin 15) and SCL (pin 14) are to be linked to the SDA and SCL lines of the I2C master.

4. Connecting I2C Sensors: SD0 to SD3 (pins 1-4) and SC0 to SC3 (pins 5-8) correspond to the SDA and SCL lines for each of the four I2C sensor channels.

5. Channel Selection: A0, A1, and A2 (pins 13, 12, and 11, respectively) are used for hardware addressing of the PCA9544APW, determining which I2C channel is active.

6. Handling Interrupts: INT (pin 9) can be connected to an interrupt pin on the I2C master to manage sensor interrupt signals.

Design Considerations:

1. Voltage Compatibility: Ensure that VCC is compatible with the logic level of the I2C master and sensors.

2. Channel Address Configuration: Set A0, A1, and A2 correctly to avoid conflicts and ensure proper channel selection.

3. Managing I2C Bus Capacitance: Be aware of the total bus capacitance, ensuring it stays within the limits of the I2C specification.

4. Interrupt Handling: Utilize the INT pin effectively for managing interrupts from the I2C sensors.

5. Power Consumption: Take advantage of the low standby current for energy-efficient operation.

In conclusion, the PCA9544APW is a versatile and efficient solution for managing multiple I2C devices, particularly in scenarios where a single I2C master needs to communicate with multiple sensors or peripherals with the same address. Its 4-channel multiplexing capability, compatibility with I2C-bus standards, and interrupt handling features make it a valuable component in complex I2C-bus systems.

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(1)Such as a deficiency in quantity, delivery of wrong items, and apparent external defects (breakage and rust, etc.), and we acknowledge such problems.

(2)We are informed of the defect described above within 90 days after the delivery of PCA9544APW.

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