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LTC2995 Datasheet(PDF) 85 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) 85 Page - Analog Devices

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LTM2985
85
Rev. 0
For more information www.analog.com
Custom thermistor table data is formatted in Ω (sensor
output resistance) vs Kelvin (see Table 96). 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 below 0x3CF.
In order to program the LTM2985 with the custom therm-
istor table, both the resistance data and the Kelvin data
are converted to 24-bit binary values. The sensor output
resistance (units = Ω) follows the convention shown in
Table 97, where the first 20 bits are the integer part and
the remaining four 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
convention shown in Table  98, where the first 14 bits
are the integer part and the remaining 10 bits are the
fractional part.
Table 96. NTC Thermistor 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
457.5
0x2C8
0x2CD
P1
80
400.2
0x2CE
0x2D3
P2
184
372.3
0x2D4
0x2D9
P3
423.2
320.1
0x2DA
0x2DF
P4
973.36
290.55
0x2E0
0x2E5
Resistance Data
Temperature Data
P5
2238.728
249.32
0x2E6
0x2EB
P6
5149.0744
240.3
0x2EC
0x2F1
P7
26775.18688
230
0x2F2
0x2F7
P8
139230.9718
215.3
0x2F8
0x2FD
P9
724001.0532
200
0x2FE
0x303
Table 97. Example Thermistor 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 219 218 217 216 215 214 213 212 211 210 29
28
27
26
25
24
23
22
21
20 2–1 2–2 2–3 2–4
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
0
0
0
0
0
0
0
1
0
1
0
0
0
0
0
0
0
0
184 0
0
0
0
0
0
0
0
0
0
0
0
1
0
1
1
1
0
0
0
0
0
0
0
423.2 0
0
0
0
0
0
0
0
0
0
0
1
1
0
1
0
0
1
1
1
0
0
1
1
973.36 0
0
0
0
0
0
0
0
0
0
1
1
1
1
0
0
1
1
0
1
0
1
0
1
2238.728 0
0
0
0
0
0
0
0
1
0
0
0
1
0
1
1
1
1
1
0
1
0
1
1
5149.074 0
0
0
0
0
0
0
1
0
1
0
0
0
0
0
1
1
1
0
1
0
0
0
1
26775.19 0
0
0
0
0
1
1
0
1
0
0
0
1
0
0
1
0
1
1
1
0
0
1
1
139231 0
0
1
0
0
0
0
1
1
1
1
1
1
1
0
1
1
1
1
1
0
0
0
0
724001.1 1
0
1
1
0
0
0
0
1
1
0
0
0
0
1
0
0
0
0
1
0
0
0
1
CUSTOM THERMISTORS



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