LTC2984_15 Datasheet, PDF (43/78 Pages) Linear Technology – Multi-Sensor High Accuracy Digital Temperature Measurement System with EEPROM

APPLICATIONS INFORMATION
LTC2984
R_SENSE
5000.2Ω
4
3
4-WIRE PT-1000
2
1
CH₁₀
0.01µF
CH₁₁
0.01µF
SENSE RESISTOR ASSIGNED TO CH₁₁ (CH_SENSE=11)
CHANNEL ASSIGNMENT
MEMORY LOCATIONS 0x228 TO 0x22B
CH₁₂
0.01µF
CH₁₃
0.01µF
RTD ASSIGNED TO CH₁₃ (CH_RTD=13)
CHANNEL ASSIGNMENT
MEMORY LOCATIONS 0x230 TO 0x233
RESULT MEMORY LOCATIONS 0x040 TO 0x043
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Figure 18. Standard 4-Wire RTD Example
Table 45. Channel Assignment Data for 4-Wire RTD (PT-1000, R_SENSE on CH₁₁, Standard 4-Wire, 25µA Excitation Current,
α = 0.00385 Standard)
CONFIGURATION
MEMORY
FIELD
DESCRIPTION # BITS BINARY DATA ADDRESS 0x230
MEMORY
ADDRESS 0x231
MEMORY
ADDRESS 0x232
MEMORY
ADDRESS 0x233
(1) RTD TYPE
PT-1000 5
01111 0 1 1 1 1
(2) Sense
CH₁₁
5
Resistor Channel
Pointer
01011
0 101 1
(3) Sensor
4-Wire,
4
1000
Configuration
No Rotate,
No Share
1000
(4) Excitation
25µA
4
0011
Current
0011
(5) Standard
European, 2
00
00
α = 0.00385
(6) Custom RTD Not Custom 12 000000000000
Data Pointer
0 0 0 0 0 0 000 0 0 0
Table 46. Channel Assignment Data for Sense Resistor (Value = 5000.2Ω)
CONFIGURATION
FIELD
DESCRIPTION # BITS
MEMORY
MEMORY
MEMORY
MEMORY
BINARY DATA ADDRESS 0x228 ADDRESS 0x229 ADDRESS 0x22A ADDRESS 0x22B
(1) Sensor Type Sense Resistor 5
11101 1 1 1 0 1
(2) Sense
Resistor Value
5000.2Ω 27 000010011100010000011001100
0000100111 000 100000110 0 1 1 00
For more information www.linear.com/LTC2984
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