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LTC2995 Datasheet(PDF) 21 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) 21 Page - Analog Devices

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LTM2985
21
Rev. 0
For more information www.analog.com
Table 5. Sensor Type Selection
31 30 29 28 27
SENSOR TYPE
0
0
0
0
0
Unassigned
0
0
0
0
1
Type J Thermocouple
0
0
0
1
0
Type K Thermocouple
0
0
0
1
1
Type E Thermocouple
0
0
1
0
0
Type N Thermocouple
0
0
1
0
1
Type R Thermocouple
0
0
1
1
0
Type S Thermocouple
0
0
1
1
1
Type T Thermocouple
0
1
0
0
0
Type B Thermocouple
0
1
0
0
1
Custom Thermocouple
0
1
0
1
0
RTD PT-10
0
1
0
1
1
RTD PT-50
0
1
1
0
0
RTD PT-100
0
1
1
0
1
RTD PT-200
0
1
1
1
0
RTD PT-500
0
1
1
1
1
RTD PT-1000
1
0
0
0
0
RTD 1000 (0.00375)
1
0
0
0
1
RTD NI-120
1
0
0
1
0
RTD Custom
1
0
0
1
1
Thermistor 44004/44033 2.252kΩ at 25°C
1
0
1
0
0
Thermistor 44005/44030 3kΩ at 25°C
1
0
1
0
1
Thermistor 44007/44034 5kΩ at 25°C
1
0
1
1
0
Thermistor 44006/44031 10kΩ at 25°C
1
0
1
1
1
Thermistor 44008/44032 30kΩ at 25°C
1
1
0
0
0
Thermistor YSI 400 2.252kΩ at 25°C
1
1
0
0
1
Thermistor Spectrum 1003k 1kΩ
1
1
0
1
0
Thermistor Custom Steinhart-Hart
1
1
0
1
1
Thermistor Custom Table
1
1
1
0
0
Diode
1
1
1
0
1
Sense Resistor
1
1
1
1
0
Direct ADC
1
1
1
1
1
Analog Temperature Sensor
Table 7. Input Channel Mapping
B7
B6
B5
B4
B3
B2 B1
B0 CHANNEL SELECTED
1
0
0
0
0
0
0
0
Multiple Channels
1
0
0
0
0
0
0
1
CH1
1
0
0
0
0
0
1
0
CH2
1
0
0
0
0
0
1
1
CH3
1
0
0
0
0
1
0
0
CH4
1
0
0
0
0
1
0
1
CH5
1
0
0
0
0
1
1
0
CH6
1
0
0
0
0
1
1
1
CH7
1
0
0
0
1
0
0
0
CH8
1
0
0
0
1
0
0
1
CH9
1
0
0
0
1
0
1
0
CH10
1
0
0
1
0
1
1
1
Sleep
All Other Combinations
Reserved
Table 6. Command Status Register
B7
B6
B5
B4
B3
B2
B1
B0
Start=1 Done=0 0
EEPROM Command and
Channel Selection 1 to 10
Start Conversion
1
0
0
1
0
1
1
1
Initiate Sleep
APPLICATIONS INFORMATION
State 3: Initiate Conversion
Once the channel assignment is complete, the device is
ready to begin a conversion. A conversion is initiated by
writing Start (B7 = 1) and Done (B6 = 0) followed by the
desired input channel (B4 – B0) into RAM memory loca-
tion 0x000 (see Tables 6 and 7). It is possible to initiate
a measurement cycle on multiple channels by setting the
channelselectionbits(B4toB0)to00000;seetheRunning
Conversions Consecutively on Multiple Channels section
of the data sheet.



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