Anonymous
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Sep 24, 2014
02:30 AM
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Sep 24, 2014
02:30 AM
Hello,
Can anyone tell me how to set I2CHW UM operating voltage to 3.3V or 5V? I set my PSoC1 system power setting to 5V, but the i2cHW still operates at 3.3V. I didn't find anywhere to change the i2c voltage and hope anyone can help out.
Thanks!
CC
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PSoC 1
2 Replies
Anonymous
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Sep 24, 2014
03:16 AM
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Sep 24, 2014
03:16 AM
Do you have pull up resistor to VCC on the 2 I2C pins? what is the voltage on the other side of the resistor?
Sep 24, 2014
06:57 AM
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Sep 24, 2014
06:57 AM
The logic high level for I2C is set by the Vdd supply for
the pullup R's. If you are using internal pullups they get
powered by whatever the PSOC Vdd is. If you use external
pullups and terminate them to 3.3V, noise margin in.
this situation significantly reduced. The min "1" level is .7 x Vdd