Hi Bryan, On bad boards the DRDY pin stays high at 20 degrees for 15 ms after we apply the supply voltage. See image 1. If we cool down the temperature of the ADS1225 to 10 degrees, the DRDY pin will stay high for 600 ms after we apply the supply voltage. See image 2. If we cool down the temperature of the ADS1225 to 0 degrees, then the DRDY pin remains high for 974 ms after we have applied the supply voltage. See picture 3. The problem is that it depends on the temperature how long the DRDY pin stays high. Do you have any idea why some ADS1225 show this behavior? This problem does not occur with good boards. With these good boards, the DRDY pin remains high for approx. 17 ms regardless of the temperature. Pin assignment for the measurement AVDD/DVDD = 3.3 VDC BUFEN/TEMPEN = GND MODE = 3.3 VDC SCLK = GND START = GND Image 1 (50 ms/div temperature 20 degrees) Image 2 (200 ms/div temperature 10 degrees) Image 3 (500 ms/div temperature 0 degrees) Hope you can give us an idea about the problem. Best regards, Richard Schreck
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