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LTC2995 Datasheet(PDF) 82 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) 82 Page - Analog Devices

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LTM2985
82
Rev. 0
For more information www.analog.com
Custom RTD table data is formatted in Ω (sensor output
resistance) vs Kelvin (see Table 92). Each table entry pair
spans six bytes. The first set of data can begin at any
memory location greater than or equal to 0x250 and end
at or below 0x3CF.
In order to program the LTM2985 with the custom RTD
table, both the resistance data and the Kelvin data are
converted to 24-bit binary values. The sensor output
CUSTOM RTDS
resistance (units=Ω) follows the convention shown in
Table 93, where the first 13 bits are the integer part and
the remaining 11 bits are the fractional part.
In order to simplify the temperature field, temperature
values are input in Kelvin as an unsigned value, but the
final temperatures reported by the LTM2985 are reported
in °C or °F. The sensor temperature (Kelvin) follows the
Table 92. RTD Example Resistance vs Kelvin Data Memory Map
POINT
SENSOR OUTPUT
RESISTANCE (Ω)
TEMPERATURE
(K)
START
ADDRESS
STOP
ADDRESS
BYTE 1
BYTE 2
BYTE 3
BYTE 1
BYTE 2
BYTE 3
P0
0
112.3
0x28C
0x291
P1
80
200.56
0x292
0x297
P2
150
273.16
0x298
0x29D
P3
257.36
377.25
0x29E
0x2A3
P4
339.22
489.66
0x2A4
0x2A9
Resistance Data
Temperature Data
P5
388.26
595.22
0x2AA
0x2AF
P6
512.99
697.87
0x2B0
0x2B5
P7
662.3
765.14
0x2B6
0x2BB
P8
743.5
801.22
0x2BC
0x2C1
P9
2001.89
900.5
0x2C2
0x2C7
Table 93. Example RTD Resistance Values
BYTE 1
BYTE 2
BYTE 3
B23 B22 B21 B20 B19 B18 B17 B16 B15 B14 B13 B12 B11 B10 B9 B8 B7 B6 B5
B4
B3
B2 B1 B0
Resistance 212 211 210 29
28
27
26
25
24
23
22
21
20 2–1 2–2 2–3 2–4 2–5 2–6 2–7 2–8 2–9 2–10 2–11
0 0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
80 0
0
0
0
0
0
1
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
150 0
0
0
0
0
1
0
0
1
0
1
1
0
0
0
0
0
0
0
0
0
0
0
0
257.36 0
0
0
0
1
0
0
0
0
0
0
0
1
0
1
0
1
1
1
0
0
0
0
1
339.22 0
0
0
0
1
0
1
0
1
0
0
1
1
0
0
1
1
1
0
0
0
0
1
0
388.26 0
0
0
0
1
1
0
0
0
0
1
0
0
0
1
0
0
0
0
1
0
1
0
0
512.99 0
0
0
1
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
0
1
0
1
1
662.3 0
0
0
1
0
1
0
0
1
0
1
1
0
0
1
0
0
1
1
0
0
1
1
0
743.5 0
0
0
1
0
1
1
1
0
0
1
1
1
1
0
0
0
0
0
0
0
0
0
0
2001.89 0
0
1
1
1
1
1
0
1
0
0
0
1
1
1
1
0
0
0
1
1
1
1
0



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