MAX31865 データシートの表示（PDF） - Maxim Integrated
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MAX31865 Datasheet PDF : 25 Pages
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MAX31865
RTD-to-Digital Converter
Table 10. Decoding RTD Faults for 2-Wire Setups When Fault Bit in RTD Data LSB
Register = 1
FAULT
STATUS
BIT SET
D7
D6
D5
D4
D3
D2
DESCRIPTION OF POSSIBLE
CAUSE
Open RTD element
Shorted RTD element
RTDIN+ shorted low
Open RTD
RTDIN+ shorted high
RTDIN- shorted high
RTDIN- shorted low
RTDIN- shorted low
RTDIN+ shorted low
Overvoltage or undervoltage fault
CONDITION DETECTED
Measured resistance greater than High Fault
Threshold value
Measured resistance less than Low Fault
Threshold value
VREFIN- > 0.85 x VBIAS
VREFIN- < 0.85 x VBIAS (FORCE- open)
VRTDIN- < 0.85 x VBIAS (FORCE- open)
Any protected input voltage >VDD or <GND1
DESCRIPTION OF
RESULTING DATA
Full scale
Near zero
Full scale
Indeterminate
Indeterminate
Appear to be valid
Appear to be valid
Near zero
Indeterminate
Table 11. Decoding RTD Faults for 3-Wire Setups When Fault Bit in RTD Data LSB
Register = 1
FAULT
STATUS
BIT SET
D7
D6
D5
D4
D3
D2
DESCRIPTION OF POSSIBLE
CAUSE
Open RTD element
RTDIN+ shorted high and not
connected to RTD
Force+ shorted high and
connected to RTD
RTDIN+ shorted to RTDIN-
RTDIN+ shorted low and not
connected to RTD
Force+ shorted low
Open RTD element
Force+ shorted high and
connected to RTD
Force+ unconnected
Force+ shorted high and not
connected to RTD
RTDIN- shorted high
RTDIN- shorted low
Force+ shorted low
RTDIN+ shorted low and
connected to RTD
RTDIN- shorted low
Overvoltage or undervoltage fault
CONDITION DETECTED
Measured resistance greater than High Fault
Threshold value
Measured resistance less than Low Fault
Threshold value
VREFIN- > 0.85 x VBIAS
VREFIN- < 0.85 x VBIAS (FORCE- open)
VRTDIN- < 0.85 x VBIAS (FORCE- open)
Any protected input voltage >VDD or < GND1
DESCRIPTION OF
RESULTING DATA
Full scale
Near zero
Full scale
Indeterminate
Appear to be valid
Near zero
Appear to be valid
Indeterminate
Maxim Integrated
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