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3 wire RTD lmp90080

Anbu Anbarasan
Prodigy 160 points
Other Parts Discussed in Thread: LMP90080

hi,

I am using lmp90080 to measure temperature using 3 wire RTD configuration.I Connected RTD1 to VIN0-VIN1,third line to the VREFP2 and RTD2 to the VIN2-VIN3, third line to the VREFP2. IB1 to RTD1 and IB2 to RTD2.

When I try to read both channels continuously, ADC reads incorrect values.But when I connect one RTD at a time I get the reading from the ADC perfectly.

The register settings is as follows

register            value

RESETCN           0xC3

BGCALCN          0x00

CHX_CONFIG(0x21)   0x76 for CH0

CHX_CONFIG(0x25)   0x76 for CH2 

RESTART          0x01

ADC_AUXCN   0x0A

CH_SCAN         0x82

CHX_INPUTCN (0x20)   0x41 for CH0

CHX_INPUTCN(ox24)    0x65  for CH2

Help me out with this..

Thanks and Regards

Anbu