LTC2984 datasheet(45/78 Pages) AD

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LTC2984

2984fb

For more information www.linear.com/LTC2984

APPLICATIONS INFORMATION

Table 47. Channel Assignment Data for Rotating 4-Wire RTD (PT-100, RSENSE on CH6, Rotating 4-Wire, 100µA Excitation Current,

α = 0.003911 Curve)

CONFIGURATION

FIELD

DESCRIPTION # BITS BINARY DATA

MEMORY

ADDRESS 0x23C

MEMORY

ADDRESS 0x23D

MEMORY

ADDRESS 0x23E

MEMORY

ADDRESS 0x23F

(1) RTD TYPE

PT-100

01100 0 1 1 0 0

(2) Sense

Resistor Channel

Pointer

CH6

00110

0 0 1 1 0

(3) Sensor

Configuration

4-Wire with

Rotation

1010

1 0 1 0

(4) Excitation

Current

100µA

0101

0 1 0 1

(5) Curve

American,

α = 0.003911

0 1

(6) Custom RTD

Data Pointer

Not Custom

000000000000

0 0 0 0 0 0 0 0 0 0 0 0

Table 48. Channel Assignment Data for Sense Resistor (Value = 10.0102kΩ)

CONFIGURATION

FIELD

DESCRIPTION # BITS

BINARY DATA

MEMORY

ADDRESS 0x214

MEMORY

ADDRESS 0x215

MEMORY

ADDRESS 0x216

MEMORY

ADDRESS 0x217

(1) Sensor Type Sense Resistor

11101 1 1 1 0 1

(2) Sense Resistor

Value

10.0102kΩ

27 000100111000110100011001100

0 0 0 1 0 0 1 1 1 0 0 0 1 1 0 1 0 0 0 1 1 0 0 1 1 0 0

Figure 21. Rotating 4-Wire RTD Example

RSENSE

10.0102k

0.01µF

2984 F21

0.01µF

SENSE RESISTOR ASSIGNED TO CH6 (CHSENSE=6)

RTD ASSIGNED TO CH16 (CHRTD=16)

CH6

CH5

CHANNEL ASSIGNMENT

MEMORY LOCATIONS 0x214 TO 0x217

CHANNEL ASSIGNMENT

MEMORY LOCATIONS 0x23C TO 0x23F

RESULT MEMORY LOCATIONS 0x04C TO 0x04F

0.01µF

CH15

CH16

CH17

PT-100

0.01µF

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