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LTC2995 датащи(PDF) 39 Page - Analog Devices

номер детали LTC2995
подробное описание детали  Isolated High Accuracy Digital Temperature Measurement System with EEPROM
PDF  90 Pages
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производитель  AD [Analog Devices]
домашняя страница  http://www.analog.com
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LTC2995 датащи(HTML) 39 Page - Analog Devices

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LTM2985
39
Rev. 0
For more information www.analog.com
Table 40. Channel Assignment Data for 2-Wire RTD #1 (PT-1000, RSENSE on CH6, 2-Wire, Shared RSENSE, 10µA Excitation Current,
α = 0.003916 Curve)
CONFIGURATION
FIELD
DESCRIPTION # BITS BINARY DATA
MEMORY
ADDRESS 0x21C
MEMORY
ADDRESS 0x21D
MEMORY
ADDRESS 0x21E
MEMORY
ADDRESS 0x21F
(1) RTD TYPE
PT-1000
5
01111 0 1 1 1 1
(2) Sense Resistor
Channel Pointer
CH6
5
00110
0 0 1 1 0
(3) Sensor
Configuration
2-Wire with
Shared RSENSE
4
0001
0 0 0 1
(4) Excitation
Current
10µA
4
0010
0 0 1 0
(5) Curve
Japanese,
α = 0.003916
2
10
1 0
(6) Custom RTD
Data Pointer
Not Custom
12
000000000000
0 0 0 0 0 0 0 0 0 0 0 0
Figure 12. Shared 2-Wire RTD Example
RSENSE
5001.5
0.01µF
2985 F12
0.01µF
SENSE RESISTOR ASSIGNED TO CH6 (CHRSENSE=6)
RTD #1 ASSIGNED TO CH8 (CHRTD=8)
RTD #2 ASSIGNED TO CH10 (CHRTD=10)
CH10
CH9
CH6
CH5
CHANNEL ASSIGNMENT
MEMORY LOCATIONS 0x214 TO 0x217
CHANNEL ASSIGNMENT
MEMORY LOCATIONS 0x21C TO 0x21F
RESULT MEMORY LOCATIONS 0x02C TO 0x02F
CHANNEL ASSIGNMENT
MEMORY LOCATIONS 0x224 TO 0x227
RESULT MEMORY LOCATIONS 0x034 TO 0x037
0.01µF
0.01µF
CH7
CH8
0.01µF
0.01µF
2-WIRE PT-1000
2-WIRE NI-120
2
1
2
1
APPLICATIONS INFORMATION



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