LTC2984 datasheet(67/78 Pages) AD

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LTC2984

2984fb

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In order to simplify the temperature field, temperature

values are input in Kelvin as an unsigned value, but the

final temperatures reported by the LTC2984 are reported

in °C or °F. The sensor temperature (Kelvin), follows the

convention shown in Table 74, 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 74. 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 75. Custom Thermocouple Channel Assignment Data

CONFIGURATION

FIELD

DESCRIPTION # BITS

BINARY

DATA

MEMORY

ADDRESS 200

MEMORY

ADDRESS 201

MEMORY

ADDRESS 202

MEMORY

ADDRESS 203

(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

Custom

Thermocouple Data

Length-1

Data Length –1

= 9

(10 Paired Entries)

001010

0 0 1 0 0 1

nel assignment data shown in Table 75 (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.RefertoTable72

where the number of six byte entries is 10.

LTC2984 Datasheet(PDF) 67 Page - Analog Devices

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