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Name: PCAL9555APW,118
Brand: NXP USA Inc.
SKU: PCAL9555APW,118
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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NXP USA Inc. PCAL9555APW,118

Part No.:: PCAL9555APW,118

Manufacturer:: NXP USA Inc.

Package:: 24-TSSOP (0.173, 4.40mm Width)

Datasheet:: PCAL9555APW,118.pdf

Description:: IC GPIO EXPANDER 24TSSOP

In Stock:: 2205

Quantity:: Add To Cart

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PCAL9555APW,118 Specifications

Package/Case:
24-TSSOP (0.173, 4.40mm Width)
Packaging:
Tape & Reel (TR),Cut Tape (CT),Digi-Reel®
Series:
Agile
ProductStatus:
Active
NumberofI/O:
16
Interface:
I²C, SMBus
InterruptOutput:
Yes
Features:
POR
OutputType:
Open Drain, Push-Pull
Current-OutputSource/Sink:
10mA, 25mA
ClockFrequency:
400 kHz
Voltage-Supply:
1.65V ~ 5.5V
OperatingTemperature:
-40°C ~ 85°C
MountingType:
Surface Mount

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PCAL9555APW,118 information

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PCAL9555APW,118 Typical application Circuitry

PCAL9555APW,118

The PCAL9555APW,118 is a 16-bit General Purpose Input/Output (GPIO) expander with an I²C-bus interface and interrupt capabilities, designed to increase the number of available GPIOs for microcontrollers in systems where additional inputs or outputs are needed. This chip is particularly useful for expanding the I/O capabilities of microcontroller-based systems without the need for larger microcontrollers, thus saving space and cost.

Key Parameters and Features:

- 16-bit I/O Expansion: Offers an expansion of 16 additional I/O ports, which can be individually configured as input or output, providing flexibility for various applications.

- I²C Interface: Enables communication with microcontrollers via a two-wire I²C interface, simplifying connections and allowing multiple devices on the same bus.

- Interrupt Output (INT): Provides an interrupt output that can be configured to alert the microcontroller of changes in input status, enhancing responsiveness without the need for continuous polling.

- Polarity Inversion Registers: Allows inversion of the logic levels on the I/O pins through software, offering compatibility with different logic systems.

- Configurable Pull-up/Pull-down Resistors: Supports software-enabled pull-up or pull-down resistors on the I/O ports, ensuring proper logic levels for inputs without external components.

Application Scenario - Expandable Digital Input System for Industrial Monitoring:

In an industrial monitoring system, the PCAL9555APW,118 can be used to interface with a variety of sensors, switches, and indicators, providing a cost-effective solution for systems requiring a large number of digital inputs and outputs.

1. Power Supply Connection: Attach the VDD pin to the system power supply. Depending on the linked microcontroller and sensors' logic level needs, the power supply may be 3.3V or 5V. This ensures that the PCAL9555APW,118 operates within the correct voltage range.

2. Ground Connection: Join the system's ground and the GND pin. A solid ground connection is essential for stable operation and minimizing noise in the signal readings.

3. I²C Bus Configuration: Connect the microcontroller's SDA (Serial Data) and SCL (Serial Clock) pins to the I²C bus. This setup facilitates communication between the microcontroller and the PCAL9555APW,118, allowing for the configuration of I/O ports and the reading of sensor data.

4. Sensor and Switch Connection: Connect digital sensors and switches to the I/O ports on the PCAL9555APW,118. Configure these ports as inputs in the device's control registers via the I²C interface. For switches, consider implementing software debouncing techniques to ensure stable input readings.

5. Indicator LEDs: Wire LEDs to some of the I/O ports configured as outputs for visual indicators of system status or sensor alerts. Include current-limiting resistors to protect the LEDs and ensure they operate within their specified current range.

6. Interrupt Handling: Attach the microcontroller's INT pin to an interrupt-capable GPIO. This allows the PCAL9555APW,118 to alert the microcontroller immediately when any of the input states change, reducing latency and the need for continuous polling of the input status.

7. Circuit Design Considerations: When designing the circuit, take into account the potential for noise in the industrial environment, which may affect sensor readings. Implement filtering and protection measures as necessary. Also, ensure that the total current through the PCAL9555APW,118 does not exceed its maximum ratings, especially when driving multiple LEDs or other loads.

By utilizing the PCAL9555APW,118 in an industrial monitoring system, developers can significantly expand the microcontroller's digital I/O capabilities in a cost-effective manner. Proper management of power supply connections, grounding, I²C communication, sensor interfacing, and addressing design challenges such as noise immunity, signal integrity, and power management, enables the creation of robust, expandable digital input systems for industrial applications.

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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.

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