I'm using ADuC7026's I2C to interface with AD5254 (digital potentiometer). Every once in a while, I get a bad pulse on the SCL line, and the AD5254 does not acknowledge the byte. The bad pulse is essentially a pulse that only rises 40-50% of the normal logic level (3.3V). Subsequently, the SDA line remains low, and I must do a hard reset of the micro to get the line back to it's high logic level.
This condition seems to occur more frequently when I'm interfacing with a host PC through the ADuC7026's serial port.
Any help would be appreciated. Matt.
I am using the I2C interface embedded in Analog Device's ADuC7026 microcontroller. I am not generating clock/data pulses in software, but relying on the micro for that.
There are 10kOhm pull-ups on each line. We're going to replace them soon for 1kOhm pull-ups.