|i2cStick Version (3.3V or 5V) FAQ (Frequently Asked Questions)|
Which i2cStick version (3.3V or 5V) should I use with my circuit?
The answer to this question depends on your circuit's I2C Bus pull-up and power requirements.
I2C Bus Pull-up Voltage:
Both the 3.3V and 5V versions of the i2cStick work with I2C Bus pull-up voltages of 3.3V to 5V. The I2C Bus pull-ups can be supplied by the i2cStick (slide switch ON), or by your circuit. The i2cStick version (3.3V or 5V) specifies the voltage level of the i2cStick supplied pull-ups.
If your circuit does not include pull-ups, it may require i2cStick pull-ups on the I2C Bus Clock and Data lines. If your circuit cannot tolerate 5V pull-ups, then the 3.3V version of the i2cStick should be used. If your circuit has its own pull-ups, you can disable the i2cStick pull-ups with the slide switch on the side of the i2cStick.
I2C Bus Power:
Both versions of the i2cStick can supply power (+V wire connected) to your circuit. The i2cStick version (3.3V or 5V) specifies the voltage level of the i2cStick supplied power (+V) pin on its I2C Bus connector.
If your circuit requires power from the i2cStick, use the i2cStick version (3.3V or 5V) that matches the voltage requirements of your circuit. Connect the i2cStick power (+V) pin on the I2C Bus connector to your circuit power line. If your circuit has its own power source, disconnect the i2cStick power line from your circuit.
Additional information can be found on the iPort
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