We are using the 2253 in an automotive application that is capable of experiencing temperatures in excess of 60C. When the temperature rises above 50C, the processor resets and continues to do so at approximately 1 second intervals. Lowering the temperature restores normal operation. The problem is occurring in multiple units. The 2253 is powered at 3.3V from a TPS7A6633 which is rock steady. We are using the internal calibrated oscillator; no external crystal involved. The output pins are connected to high-side drivers and NPN transistors through 4.7K resistors. One input port is used and isolated through a 47K series resistor fed from a voltage divider (14volts in / 3 volts out).
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