blueroomelectronics
Well-Known Member
I'm looking at the datasheet for an I2C expander IC MCP23009 and it uses a single pin with a voltage divider (two resistors ~5% tolerance) to determine the I2C address.
For 3 address a three post jumper with a resistor divider would work. Shorting out a resistor would give 0 or VCC and no jumpers would be the voltage from the divider.
Any ideas on how to get all 8 addresses? A simple trimpot seems a little inaccurate IMHO.
For 3 address a three post jumper with a resistor divider would work. Shorting out a resistor would give 0 or VCC and no jumpers would be the voltage from the divider.
Any ideas on how to get all 8 addresses? A simple trimpot seems a little inaccurate IMHO.