Details

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BUY MCP23017-E/SP https://www.utsource.net/itm/p/12608624.html

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 渭A (quiescent current)
Operating Temperature	Temperature range for operation	-40掳C to +85掳C

Instructions for Use:

1. Power Supply:

   • Connect VDD to a supply voltage between 1.8V and 5.5V.
   • Connect GND to the system ground.

2. 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.

3. 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.

4. 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).

5. Reading Inputs:

   • Read from the input latch registers (INTCAPA/B) to get the current state of the input pins.

6. Writing Outputs:

   • Write to the output latches (OLATA/B) to control the state of the output pins.

7. 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.

8. Power Management:

   • Ensure proper power sequencing during startup and shutdown to avoid potential issues with data corruption or damage.

9. Environmental Considerations:

   • Operate within the specified temperature range to ensure reliable performance.

(For reference only)