MCP23S18T-E/MJVAO

Product Overview

• Category: Integrated Circuit
• Use: GPIO Expander
• Characteristics: SPI Interface, 16-Bit I/O Expander, Low Power Consumption
• Package: TSSOP-28
• Essence: Expand the number of available general-purpose input/output (GPIO) pins on a microcontroller or microprocessor.
• Packaging/Quantity: Tape and Reel, 2500 units per reel

Specifications

• Interface: SPI (Serial Peripheral Interface)
• Number of I/O Pins: 16
• Supply Voltage: 1.8V to 5.5V
• Operating Temperature Range: -40°C to +85°C
• Maximum Frequency: 10 MHz
• Current Consumption: 1 µA (standby), 100 µA (active)

Pin Configuration

The MCP23S18T-E/MJVAO has a total of 28 pins in a TSSOP package. The pin configuration is as follows:

1. VDD - Supply Voltage
2. VSS - Ground
3. NC - No Connection
4. SCK - Serial Clock Input
5. SI - Serial Data Input
6. SO - Serial Data Output
7. CS - Chip Select Input
8. RESET - Reset Input
9. GPA0 - General Purpose I/O Pin 0
10. GPA1 - General Purpose I/O Pin 1
11. GPA2 - General Purpose I/O Pin 2
12. GPA3 - General Purpose I/O Pin 3
13. GPA4 - General Purpose I/O Pin 4
14. GPA5 - General Purpose I/O Pin 5
15. GPA6 - General Purpose I/O Pin 6
16. GPA7 - General Purpose I/O Pin 7
17. GPB0 - General Purpose I/O Pin 8
18. GPB1 - General Purpose I/O Pin 9
19. GPB2 - General Purpose I/O Pin 10
20. GPB3 - General Purpose I/O Pin 11
21. GPB4 - General Purpose I/O Pin 12
22. GPB5 - General Purpose I/O Pin 13
23. GPB6 - General Purpose I/O Pin 14
24. GPB7 - General Purpose I/O Pin 15
25. INTA - Interrupt Output A
26. INTB - Interrupt Output B
27. A2 - Address Input Bit 2
28. A1 - Address Input Bit 1

Functional Features

• Expand the number of GPIO pins available on a microcontroller or microprocessor.
• SPI interface allows for easy communication with the host device.
• Configurable interrupt outputs provide efficient event-driven operation.
• Supports both input and output modes for each I/O pin.
• Programmable pull-up resistors for input pins.
• Can be cascaded to support multiple MCP23S18T-E/MJVAO devices.

Advantages and Disadvantages

Advantages: - Easy integration with SPI interface. - Low power consumption, suitable for battery-powered applications. - Wide supply voltage range allows compatibility with various systems. - Configurable interrupt outputs enhance system responsiveness. - Compact TSSOP package saves board space.

Disadvantages: - Limited number of I/O pins (16) compared to other expanders. - Requires additional components (microcontroller/microprocessor) for full functionality.

Working Principles

The MCP23S18T-E/MJVAO is an SPI-based GPIO expander. It communicates with a microcontroller or microprocessor through the SPI interface, expanding the available GPIO pins. The device can be configured as either an input or output for each pin individually. It supports interrupt outputs, allowing the host device to be notified of specific events without continuously polling the GPIO status. The MCP23S18T-E/MJVAO operates at low power consumption levels and can be cascaded to support multiple devices.

Application Field Plans

The MCP23S18T-E/MJVAO is widely used in various applications that require additional GPIO pins beyond what the microcontroller or microprocessor provides. Some common application fields include:

1. Industrial Automation: Control systems, data acquisition, and monitoring devices often require a large number of I/O pins for interfacing with sensors, actuators, and other peripherals.
2. Home Automation: Smart home devices, such as lighting control systems, security systems, and HVAC systems, can benefit from the expanded GPIO capabilities offered by the MCP23S18T-E/MJVAO.
3. Robotics: Robotic systems often require numerous I/O pins to control motors, sensors, and communication interfaces.
4. IoT (Internet of Things): IoT devices frequently need additional GPIO pins to interface