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LTC2995 Datasheet(PDF) 65 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) 65 Page - Analog Devices

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LTM2985
65
Rev. 0
For more information www.analog.com
APPLICATIONS INFORMATION
Universal Example
TheLTM2985iscapableofsharingoneprotectedinterface
with multiple sensor types (see Figure 47). This includes
all RTD configurations (2-, 3- and 4-wire), thermistors and
thermocouples. Switching between sensors only requires
a new channel assignment word via software control.
The multi-sensor circuit provides 4 input terminals, each
protectedagainstexternalovervoltageconditions.Inorder
to enable Kelvin current excitation mode for all sensors
set all 3 global configuration bits G4, G5 and G6 to 1 (see
Table 67).
2985 F45
CH2
CH1
CH3
CH4
RP1
RP2
= EXTERNAL TERMINAL CAN BE
EXPOSED TO FAULT VOLTAGE.
RP3
RSENSE
EXCITATION
CURRENT
FLOW
I1
CH5
RP4
ILEAK
ILEAK
2985 F46
EXCITATION
CURRENT
FLOW
CHTHERM–1
CHTHERM
CHTHERM+1
= CHTHERM (2 ≤ THERM ≤ 9)
GLOBAL REGISTER G6 = 1
CHANNEL
ASSIGNMENT
2ND TERMINAL TIES TO SENSE RESISTOR (CHRSENSE)
Figure 46. Thermistor Kelvin Current Mode Channel
Assignment Convention (G6 = 1)
Figure 45. Thermistor Kelvin Current Source Mode (G6 = 1)
In Figure 48, a 4-wire RTD is tied directly to the 4 input
terminals. In this case, the 4-wire RTD is assigned to CH6
and the sense resistor is tied to CH2. The excitation current
flows through protection resisters RP1 and RP6. Since
RP6 is grounded, RSENSE sharing and excitation current
rotation are off.
Figure 47. Universal Multi-Sensor Schematic
RP6
2985 F47
CH3
CH2
CH1
CH4
CH5
CH8
CH9
COM
CH7
CH6
RP2
RP3
RP8
RP5
RSENSE
MULTI SENSOR:
2-, 3,- 4-WIRE RTD
THERMISTOR
THERMOCOUPLE
RP4
RP1
T2
T3
T4
T1
RP7
Figure 48. Protected Multi-Sensor 4-Wire RTD Connection
RP6
2985 F48
CH3
CH2
CH1
CH4
CH5
CH8
CH9
COM
CH7
CH6
RP2
RP3
RP8
RP5
RSENSE
RP4
RP1
RP7
3
4
2
1
T2
T3
T4
T1



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