MCP23008-E/ML

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1. Describe

The MCP23X08 device provides 8-bit universal Parallel I/O expansion for I2C bus or SPI application. The number of two devices is different Hardware address pins and serial interface:

- MCP23008-I2C interface; three address pins

- MCP23S08-SPI interface; two address pins

MCP23X08 consists of multiple 8-bit configurations Registers for input, output and polarity selection. this The system master can enable I/O as input or Output by writing the I/O configuration bit. data Each input or output is saved in the corresponding Input or output register. Polarity of input port Register can be reversed with polarity reversal Register. All registers can be read by the system host Interrupt output can be configured to be active In two cases (mutually exclusive):

1. When any input state is different from it Corresponding input port register status, which is Used to indicate to the system host a The input status has changed.

2. When the input state is different from the pre-configuration Register value (DEFVAL register).

The interrupt capture register captures the port value in the following locations The time of the interruption to save the condition Cause an interruption. Power-on reset (POR) sets the registers to their Default value and initialize the device state machine. The hardware address pin is used to determine Device address.

2. Feature

    1. 8-bit remote bidirectional I/O port

        - I/O pins are input by default

    2. High-speed I2C™ interface (MCP23008)

        - 100 kHz

        - 400 kHz

        - 1.7 MHz

    3. High-speed SPI interface (MCP23S08)

        - 10 MHz

    4. Hardware address pins

        - Three of MCP23008, up to eight are allowed Devices on the bus

        - MCP23S08 has two, and a maximum of four are allowed Devices using the same chip selection

    5. Configurable interrupt output pin

        - Configurable as active high, active low or open drain

    6. Configurable interrupt source

        - Interrupt when changing from the configured default value Or pin change

    7. Polarity reversal register configuration polarity Input port data

    8. External reset input

    9. Low standby current: 1 µA (maximum)

  10. Operating Voltage:

        - 1.8V to 5.5V @ -40°C to +85°C

           I2C @ 100 kHz

           SPI @ 5 MHz

        - 2.7V to 5.5V @ -40°C to +85°C

           I2C @ 400 kHz

           SPI @ 10 MHz

        - 4.5V to 5.5V @ -40°C to +125°C

           I2C @ 1.7 kHz

           SPI @ 10 MHz

3. Pin configuration

4. Pin description