LTC2983C View Datasheet(PDF) - Linear Technology
Part Name
Description
MFG CO.
'LTC2983C' PDF : 72 Pages View PDF
LTC2983
Applications Information
Table 5. Sensor Type Selection
31 30 29 28 27
00000
SENSOR TYPE
Unassigned
software includes a utility for checking configuration data and
generating annotated C-code for programming the channel
assignment data.
00001
00010
00011
00100
00101
00110
00111
01000
01001
01010
01011
Type J Thermocouple
Type K Thermocouple
Type E Thermocouple
Type N Thermocouple
Type R Thermocouple
Type S Thermocouple
Type T Thermocouple
Type B Thermocouple
Custom Thermocouple
RTD PT-10
RTD PT-50
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
channel selection bits (B4 to B0) to 00000; see the Running
Conversions Consecutively on Multiple Channels section
of the data sheet.
01100
01101
01110
01111
10000
10001
10010
10011
10100
10101
10110
10111
11000
11001
11010
11011
11100
11101
11110
11111
RTD PT-100
RTD PT-200
RTD PT-500
RTD PT-1000
RTD 1000 (0.00375)
RTD NI-120
RTD Custom
Thermistor 44004/44033 2.252kΩ at 25°C
Thermistor 44005/44030 3kΩ at 25°C
Thermistor 44007/44034 5kΩ at 25°C
Thermistor 44006/44031 10kΩ at 25°C
Thermistor 44008/44032 30kΩ at 25°C
Thermistor YSI 400 2.252kΩ at 25°C
Thermistor Spectrum 1003k 1kΩ
Thermistor Custom Steinhart-Hart
Thermistor Custom Table
Diode
Sense Resistor
Direct ADC
Reserved
specific configurations. These include pointers to cold junction
or sense resistor channels, pointers to memory locations of
custom linearization data, sense resistor values and diode
ideality factors. Also included in this data are, if applicable, the
excitation current level, single-ended/differential input mode,
as well as sensor specific controls. Separate detailed operation
sections for thermocouples, RTDs, diodes, thermistors, and
sense resistors describe the assignment data associated with
each sensor type in more detail. The LTC2983 demonstration
Table 6. Command Status Register
B7
B6 B5 B4 B3 B2 B1 B0
Start = 1 Done = 0 0 Channel Selection 1 to 20
1
0 010111
Start Conversion
Initiate Sleep
Table 7. Input Channel Mapping
B7 B6 B5 B4 B3 B2 B1
1 0 0 0 000
1 0 0 0 000
1 0 0 0 001
1 0 0 0 001
1 0 0 0 010
1 0 0 0 010
1 0 0 0 011
1 0 0 0 011
1 0 0 0 100
1 0 0 0 100
1 0 0 0 101
1 0 0 0 101
1 0 0 0 110
1 0 0 0 110
1 0 0 0 111
1 0 0 0 111
1 0 0 1 000
1 0 0 1 000
1 0 0 1 001
1 0 0 1 001
1 0 0 1 010
1 0 0 1 011
All Other Combinations
B0 CHANNEL SELECTED
0 Multiple Channels
1 CH1
0 CH2
1 CH3
0 CH4
1 CH5
0 CH6
1 CH7
0 CH8
1 CH9
0 CH10
1 CH11
0 CH12
1 CH13
0 CH14
1 CH15
0 CH16
1 CH17
0 CH18
1 CH19
0 CH20
1 Sleep
Reserved
2983fa
18
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