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1. Description
The MCP23008T-E/SO 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:
1. MCP23008-I2C interface; three address pins
2. MCP23S08-SPI interface; two address pins
MCP23X08 consists of multiple 8-bit configurations Registers for input, output and polarity selection. The 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 Sign up. 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, thereby saving the condition Cause an interruption. Power-on reset (POR) sets the register to Default value and initialize the device state machine. The hardware address pin is used to determine Device address.
2. Features
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 for 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 high level active, low level active or Open drain
6. Configurable interrupt source
- Interrupt when changing from the configured default value Or pin change
7. Polarity inversion register configuration Polarity of input port data
8. External reset input
9. Low standby current: 1 µA (maximum)
10. Working voltage:
- 1.8V to 5.5V at -40°C to +85°C，I2C at 100 kHz，SPI at 5 MHz
- 2.7V to 5.5V at -40°C to +85°C，I2C at 400 kHz，SPI at 10 MHz
- 4.5V to 5.5V at -40°C to +125°C，I2C at 1.7 kHz，SPI at 10 MHz
3. Packages
1. 18-pin PDIP (300 mil)
2. 18-pin SOIC (300 mil)
3. 20-pin SSOP
4. 20-pin QFN
4. Pin configuration
5. Product outline
