LTC2984 datasheet(43/78 Pages) AD

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LTC2984

2984fb

For more information www.linear.com/LTC2984

APPLICATIONS INFORMATION

Table 45. Channel Assignment Data for 4-Wire RTD (PT-1000, RSENSE on CH11, Standard 4-Wire, 25µA Excitation Current,

α = 0.00385 Curve)

CONFIGURATION

FIELD

DESCRIPTION # BITS BINARY DATA

MEMORY

ADDRESS 0x230

MEMORY

ADDRESS 0x231

MEMORY

ADDRESS 0x232

MEMORY

ADDRESS 0x233

(1) RTD TYPE

PT-1000

01111 0 1 1 1 1

(2) Sense

Resistor Channel

Pointer

CH11

01011

0 1 0 1 1

(3) Sensor

Configuration

4-Wire,

No Rotate,

No Share

1000

1 0 0 0

(4) Excitation

Current

25µA

0011

0 0 1 1

(5) Curve

European,

α = 0.00385

0 0

(6) Custom RTD

Data Pointer

Not Custom

000000000000

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

Table 46. Channel Assignment Data for Sense Resistor (Value = 5000.2Ω)

CONFIGURATION

FIELD

DESCRIPTION # BITS

BINARY DATA

MEMORY

ADDRESS 0x228

MEMORY

ADDRESS 0x229

MEMORY

ADDRESS 0x22A

MEMORY

ADDRESS 0x22B

(1) Sensor Type Sense Resistor

11101 1 1 1 0 1

(2) Sense

Resistor Value

5000.2Ω

000010011100010000011001100

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

Figure 18. Standard 4-Wire RTD Example

RSENSE

5000.2

0.01µF

2984 F18

0.01µF

SENSE RESISTOR ASSIGNED TO CH11 (CHSENSE=11)

RTD ASSIGNED TO CH13 (CHRTD=13)

CH11

CH10

CHANNEL ASSIGNMENT

MEMORY LOCATIONS 0x228 TO 0x22B

CHANNEL ASSIGNMENT

MEMORY LOCATIONS 0x230 TO 0x233

RESULT MEMORY LOCATIONS 0x040 TO 0x043

0.01µF

CH12

CH13

4-WIRE PT-1000

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