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 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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CAT9555YI-T2 information

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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.

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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.

(2)We are informed of the defect described above within 90 days after the delivery of CAT9555YI-T2.

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

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(1)Inform us within 90 days

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