MCP23017-E/SP: Top Choice in United States (USA) Utsource Holding Company Limited

Description

Parameter	Description	Value/Range
Operating Voltage (VDD)	Supply voltage range	1.8V to 5.5V
I2C Address	Default I2C address	0x20 to 0x27
GPIO Pins	Number of General Purpose Input/Output pins	16
Interrupt Output	Active-low open-drain interrupt output pin	INTA, INTB
Configuration Registers	Registers for configuring the device	IODIRA/B, IPOLA/B, GPINTENA/B, etc.
Input Latch Registers	Registers that hold the state of the input pins	INTCAPA/B
Output Latches	Registers that control the state of the output pins	OLATA/B
Polarity Inversion	Option to invert polarity of the port	IPOLA/B
Interrupt Control	Control how interrupts are generated	INTCONA/B
Power Consumption	Typical power consumption	< 4 μA (quiescent current)
Operating Temperature	Temperature range for operation	-40°C to +85°C

Power Supply:
- Connect VDD to a supply voltage between 1.8V and 5.5V.
- Connect GND to the system ground.
I2C Bus Connection:
- Connect SDA and SCL to the I2C bus lines of your microcontroller.
- Ensure pull-up resistors are present on both SDA and SCL lines if not already provided by the system.
Address Configuration:
- Set the address using the A0, A1, and A2 pins. The default address is 0x20, which can be changed by connecting these pins to VDD or GND.
Initialization:
- Write to configuration registers (IODIRA/B, IPOLA/B, etc.) to set up the desired behavior of each GPIO pin (input/output, polarity, interrupt settings).
Reading Inputs:
- Read from the input latch registers (INTCAPA/B) to get the current state of the input pins.
Writing Outputs:
- Write to the output latches (OLATA/B) to control the state of the output pins.
Handling Interrupts:
- Configure interrupt settings via INTCONA/B and other related registers.
- Monitor the INTA/B pins to detect when an interrupt occurs.
- Read INTCAPA/B to determine which pin(s) triggered the interrupt.
Power Management:
- Ensure proper power sequencing during startup and shutdown to avoid potential issues with data corruption or damage.
Environmental Considerations:
- Operate within the specified temperature range to ensure reliable performance.

(For reference only)