LTC2995 datasheet(78/90 Pages) AD

78 / 90 page

LTM2985

Rev. 0

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Figure 58. Custom Thermocouple Example (mV vs Kelvin)

2985 F58

TEMPERATURE (K)

(0mV, 0K)

NOTE:

P0 SHOULD BE THE

EXTRAPOLATION

POINT TO 0K

VOLTAGE (mV)

VOLTAGE < p1

SOFT FAULT

CONDITION

VOLTAGE > p9

SOFT FAULT

CONDITION

(0mV, 273.15K)

CUSTOM THERMOCOUPLES

In addition to digitizing standard thermocouples, the

LTM2985 can also digitize user-programmable, custom

thermocouples(thermocoupletype=0b01001,seeTable 16).

Custom sensor data (minimum of three, maximum of 64

pairs) reside sequentially in memory and are arranged in

blocks of six bytes of monotonically increasing tabular

data as mV vs temperature (see Table 86).

Custom Thermocouple Example

In this example, a simplified thermocouple curve is

implemented (see Figure 58). Points P1 to P9 represent

the normal operating range of the custom thermocouple.

Voltage readings above point P9 result in a soft fault and

Table 86. Custom Thermocouple Tabular Data Format

ADDRESS

BYTE 0 BYTE 1 BYTE 2 BYTE 3 BYTE 4 BYTE 5

0x250 + 6 • Start Address

Table Entry #1 (mV) Table Entry #1 (Kelvin)

0x250 + 6 • Start Address + 6 Table Entry #2 (mV) Table Entry #2 (Kelvin)

0x250 + 6 • Start Address + 12 Table Entry #3 (mV) Table Entry #3 (Kelvin)

•

Max Address = 0x3CA

Table Entry #64 (mV) Table Entry #64 (Kelvin)

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