CRD300DA12E-XM3 Phase Temperature Read

BorjaH

Hi,

I'm trying to measure phases and case temperatures of the CRD300DA12E-XM3 converter and I do not understand the results I'm measuring. Please see attached a screenshot of the read values in ADC units.

I have a couple of questions.

1. I'm trying to read the phase temperatures trough the analog voltages (ADC_A4, ADC_A5 and ADC_C4) instead of the frequency signal. In all cases I'm reading 0 in ADC units, which I assume is 0V. According to Table 5 of the user guide, this corresponds with a temperature less than 0ºC, which makes no sense.
2. For the case temperature I'm reading 2545 in ADC units, which I assume that corresponds to 1.86V (assuming a 0-3V range for 0-4095 ADC range). Is this right? If I substitute 1.86V in equation 2, this gives me a case temperature of 304.1K (30.95 ºC), which makes sense for me.

Best regards,

Borja