LTC2995 datasheet(80/90 Pages) AD

80 / 90 page

LTM2985

Rev. 0

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In order to simplify the temperature field, temperature

valuesareinputinKelvinasanunsignedvalue,butthefinal

temperatures reported by the LTM2985 are reported in °C

or °F (see Table 9A and Table 9B). The sensor temperature

(Kelvin), follows the convention shown in Table 89, where

the first 14 bits are the integer part and the remaining 10

bits are the fractional part.

Inthisexample,acustomthermocoupletiedtoCH1,witha

coldjunctionsensoronCH2,isprogrammedwiththechan-

CUSTOM THERMOCOUPLES

Table 89. Example Thermocouple Temperature Values

BYTE 3

BYTE 4

BYTE 5

B23 B22 B21 B20 B19 B18 B17 B16 B15 B14 B13 B12 B11 B10 B9 B8 B7 B6 B5 B4 B3 B2 B1 B0

Temperature 213 212 211 210 29

20 2–1 2–2 2–3 2–4 2–5 2–6 2–7 2–8 2–9 2–10

0 0

99.1 0

135.4 0

273.15 0

361.2 0

522.1 0

720.3 0

811.2 0

922.5 0

1000 0

Table 90. Custom Thermocouple Channel Assignment Data

CONFIGURATION

FIELD

DESCRIPTION # BITS

BINARY

DATA

MEMORY

ADDRESS 0x200

MEMORY

ADDRESS 0x201

MEMORY

ADDRESS 0x202

MEMORY

ADDRESS 0x203

(1) Thermocouple

Type

Type Custom

01001 0 1 0 0 1

(2) Cold Junction

Channel Pointer

CH2

00010

0 0 0 1 0

(3) Sensor

Configuration

Single-Ended,

10µA Open Circuit

1100

1 1 0 0

Not Used

Set These Bits to 0

000000

0 0 0 0 0 0

(4) Custom

Thermocouple Data

Pointer

Start Address = 0

(Start at 0x250)

000000

0 0 0 0 0 0

(5) Custom

Thermocouple Data

Length-1

Data Length –1

= 9

(10 Paired Entries)

001001

0 0 1 0 0 1

nel assignment data shown in Table 90 (refer to Figure 9

for similar format). In this case the custom data begins at

memory location 0x250 (starting address is 0). The start-

ing address (offset from 0x250) is entered in the custom

thermocouple data pointer field of the channel assignment

data. The table data length –1 (9 in this example) is entered

into the custom thermocouple data length field of the

thermocouplechannelassignmentword.RefertoTable 87

where the number of six byte entries is 10.

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