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LTC2995 Datasheet(PDF) 87 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) 87 Page - Analog Devices

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LTM2985
87
Rev. 0
For more information www.analog.com
CUSTOM THERMISTORS
In addition to custom table driven thermistors, it is also
possible to directly input Steinhart-Hart coefficients into
the LTM2985 (thermistor Type 11010, see Table  55).
Steinhart-Hart coefficients are commonly specified
parameters provided by thermistor manufacturers. The
Steinhart-Hart equation is:
1
T
= A +B • ln(R)+C • ln(R)2 +D •ln(R)3 +E • ln(R)4
+F •ln(R)5
Steinhart-Hart data is stored sequentially in any memory
location greater than or equal to 0x250 and below 0x3CF.
Each coefficient is represented by a standard, single-
precision, IEEE754 32-bit value (see Table 100).
Example Custom Steinhart-Hart Thermistor
In this example a Steinhart-Hart equation is entered into
memory starting at location 0x2C8 (see Table 101).
Table 100. Steinhart-Hart Custom Thermistor Data Format
ADDRESS
COEFFICIENT
VALUE
0x250 + 6 • Start Address
A
32-Bit Single-Precision Floating Point Format
0x250 + 6 • Start Address + 4
B
32-Bit Single-Precision Floating Point Format
0x250 + 6 • Start Address + 8
C
32-Bit Single-Precision Floating Point Format
0x250 + 6 • Start Address + 12
D
32-Bit Single-Precision Floating Point Format
0x250 + 6 • Start Address + 16
E
32-Bit Single-Precision Floating Point Format
0x250 + 6 • Start Address + 20
F
32-Bit Single-Precision Floating Point Format
Table 101. Custom Steinhart-Hart Data Example
COEFFICIENT VALUE
START
ADDRESS SIGN
EXPONENT
MANTISSA
MSB
LSB MSB
LSB
A
1.45E-03 0x2C8
0
0 1 1 1 0 1 0 1
0
1 1 1 1 1 0 0 0 0 0 1 1 0 1 1 1 1 0 1 1 0 1
B
2.68E-04 0x2CC
0
0 1 1 1 0 0 1 1
0
0 0 1 1 0 0 1 0 0 0 0 0 1 0 0 1 0 1 1 0 1 0
C
0
0x2D0
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 0 0 0 0 0 0 0
D
1.64E-07 0x2D4
0
0 1 1 0 1 0 0 0
0
1 1 0 0 0 0 0 0 0 1 0 1 1 1 1 1 1 1 1 0 1 0
E
0
0x2D8
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 0 0 0 0 0 0 0
F
0
0x2DC
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 0 0 0 0 0 0 0



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