What is the Additional Feature ?

Name: CAT9555YI-T2
Brand: ON Semiconductor
SKU: CAT9555YI-T2
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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ON Semiconductor CAT9555YI-T2

Part No.:: CAT9555YI-T2

Manufacturer:: ON Semiconductor

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

Datasheet:: CAT9555YI-T2.pdf

Description:: IC I/O EXPANDER I2C 16B 24TSSOP

In Stock:: 2572

Quantity:: Add To Cart

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CAT9555YI-T2 Typical application Circuitry

CAT9555YI-T2

The CAT9555YI-T2 is a 16-bit I/O expander with an I²C interface, designed to provide additional GPIOs for microcontrollers. It is particularly useful in applications where extra input/output pins are needed.

Applications: This CAT9555YI-T2 chip is widely used in applications such as keypad control, LED indicators, and port expansion in embedded systems, consumer electronics, and industrial control systems.

Key Specifications: The CAT9555YI-T2 operates at a voltage range of 2.3V to 5.5V, making it compatible with both 3.3V and 5V systems. It offers 16 configurable I/O pins, interrupt output for input change detection and a maximum I²C clock frequency of 400 kHz.

Application Scenario: LED Matrix Control

1. Power Supply: Connect VDD (pin 24) to a 3.3V power source to ensure stable operation. Adequate decoupling capacitors should be placed close to this pin to filter out noise.

2. Ground Connection: Attach all ground pins (1, 12, 13) to the system's ground plane for a reliable reference point and noise reduction.

3. I²C Communication: Link SDA (pin 23) and SCL (pin 22) to the corresponding I²C data and clock lines of the microcontroller. These connections are essential for configuring and controlling the I/O expander.

4. Output Configuration: Configure the P0-P7 (pins 2-9) and P10-P17 (pins 14-21) as outputs to drive the rows and columns of the LED matrix, respectively. This setup allows for individual control of each LED.

5. Input Configuration: Optionally, some of the P0-P17 pins can be configured as inputs to read button states or other signals, providing interactive capabilities to the system.

6. Interrupt Feature: Connect the INT (pin 10) to an interrupt-capable pin of the microcontroller to receive notifications about input state changes, enhancing the system's responsiveness.

Design Considerations

- I²C Addressing: Ensure that the I²C address of the CAT9555YI-T2 does not conflict with other devices on the same bus. Address pins (A0-A2) can be used to set the device address.

- Signal Integrity: Implement proper routing techniques for the I²C lines to minimize crosstalk and signal degradation, ensuring reliable communication.

- Power Management: Consider the power consumption of the LED matrix and ensure that the power supply can handle the load. Additionally, implement power-saving features if necessary.

- Thermal Management: If the system generates significant heat, especially in high-density LED applications, consider adding heat sinks or thermal vias to maintain optimal operating temperatures.

In summary, the CAT9555YI-T2 is a versatile I/O expander that can significantly enhance the capabilities of microcontroller-based systems, especially in scenarios requiring additional GPIOs like LED matrix control. Attention to I²C addressing, signal integrity, power management, and thermal management is crucial for successful circuit design with this chip.

CAT9555YI-T2 information

CAT9555YI-T2 Specifications

Package/Case:
24-TSSOP (0.173, 4.40mm Width)
Packaging:
Tape & Reel (TR),Cut Tape (CT),Digi-Reel®
Series:
-
ProductStatus:
Active
NumberofI/O:
16
Interface:
I²C, SMBus
InterruptOutput:
Yes
Features:
POR
OutputType:
Push-Pull
Current-OutputSource/Sink:
10mA, 24mA
ClockFrequency:
400 kHz
Voltage-Supply:
2.3V ~ 5.5V
OperatingTemperature:
-40°C ~ 85°C
MountingType:
Surface Mount

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6. What is the process for return or replacement of CAT9555YI-T2?

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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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(3)The PartNo is unused and only in the original unpacked packaging.

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