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LTC2995 Datasheet(PDF) 66 Page - Analog Devices

Part # LTC2995
Description  Isolated High Accuracy Digital Temperature Measurement System with EEPROM
PDF  90 Pages
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

LTC2995 Datasheet(HTML) 66 Page - Analog Devices

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LTM2985
66
Rev. 0
For more information www.analog.com
APPLICATIONS INFORMATION
Figure 49 shows the interface to a 3-wire RTD using the
multi-sensor circuit. In this case, the RTD ties directly to
terminals T1 – T3 and terminal T4 is left floating. Matched
excitationcurrentsflowfromCH7andCH8throughprotec-
tion resistors RP7 and RP8 while the RTD measurement
occurs at CH5 and CH6. The 3-wire RTD is assigned to
CH6 and RSENSE sharing is turned on.
Figure 50 shows the interface to a 2-wire RTD using the
LTM2985 multi-sensor circuit. In this case, the RTD ties
directly to terminals T1 and T2 while terminals T3 and T4
are left floating. The excitation currents flows from CH1
through RSENSE and protection resistors RP1 and RP4
(CH5 is internally grounded) while the RTD measurement
occurs at CH3 and CH4. The 2-wire RTD is assigned to
CH4 and RSENSE sharing is turned on.
Figure 51 shows the interface to a thermistor using the
LTM2985 multi-sensor circuit. In this case, the thermistor
ties directly to terminals T1 and T2 while terminals T3 and
T4 are left floating. The excitation current flows from CH1
throughRSENSEandprotectionresistorsRP1andRP4(CH5
is internally grounded) while the thermistor differential
measurement occurs at CH3 and CH4. The thermistor is
assigned to CH4 and RSENSE sharing is enabled in order
to provide an internal ground connection.
Figure 49. Protected Multi-Sensor 3-Wire RTD Connection
RP6
2985 F49
CH3
CH2
CH1
CH4
CH5
CH8
CH9
COM
CH7
CH6
RP2
RP3
RP8
RP5
RSENSE
RP4
RP1
RP7
2
3
1
T2
T3
T4
T1
Figure 51. Protected Multi-Sensor Thermistor Connection
RP6
2985 F51
CH3
CH2
CH1
CH4
CH5
CH8
CH9
COM
CH7
CH6
RP2
RP3
RP8
RP5
RSENSE
RP4
RP1
RP7
T2
T3
T4
T1
Figure 50. Protected Multi-Sensor 2-Wire RTD Connection
RP6
2985 F50
CH3
CH2
CH1
CH4
CH5
CH8
CH9
COM
CH7
CH6
RP2
RP3
RP8
RP5
RSENSE
RP4
RP1
RP7
2
1
T2
T3
T4
T1



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