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1. Describe
The MCP23017/MCP23S17 (MCP23X17) device family provides 16-bit general purpose parallel I/O expansion for I2C bus or SPI applications. The MCP23X17 consists of multiple 8-bit configuration registers for input, output and polarity selection. The system host can enable I/O as input or output by writing to the I/O configuration bits (IODIRA/B). The data for each input or output is stored in the corresponding input or output register. The polarity of the input port registers can be reversed by the polarity inversion register. All registers can be read by the system host. The 16-bit I/O port is functionally composed of two 8-bit ports (PORTA and PORTB). The MCP23X17 can be configured to operate in 8-bit or 16-bit mode via IOCON.BANK. There are two interrupt pins, INTA and INTB, that can be associated with their respective ports, or can be ORed together so that when either port causes an interrupt, both pins will be active. The Interrupt Capture Register captures the port value upon interrupt, thus saving the condition that caused the interrupt. A power-on reset (POR) sets registers to their default values and initializes the device state machine. The hardware address pins are used to determine the device address.
2. Feature
1. 16-bit remote bidirectional I/O port:
- I/O pins default to inputs
2. High-speed I2C interface (MCP23017):
- 100 kHz
- 400 kHz
- 1.7 MHz
3. High-speed SPI interface (MCP23S17):
- 10 MHz (max)
4. Three hardware address pins allow up to There are eight devices on the bus
5. Configurable interrupt output pins:
- Configurable as active high, active low or open drain
6. INTA and INTB can be configured to run independently or together
7. Configurable interrupt sources:
- Change interrupt from configuration register Default or pin change
8. Polarity Inversion Register Configuration Polarity of input port data
9. External reset input
10. Low standby current: 1 µA (max)
11. Operating Voltage:
- 1.8V to 5.5V @ -40°C to +85°C
- 2.7V to 5.5V @ -40°C to +85°C
- 4.5V to 5.5V @ -40°C to +125°C
3. Pin configuration
4. Pin Description
