LTC2984 datasheet(41/78 Pages) AD

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LTC2984

2984fb

For more information www.linear.com/LTC2984

Figure 15. 3-Wire RTD Example

RSENSE

12,150.39

2984 F15

0.01µF

RSENSE ASSIGNED TO CH7 (CHSENSE=7)

3-WIRE RTD ASSIGNED TO CH9 (CHRTD=9)

CH7

CH6

CHANNEL ASSIGNMENT

MEMORY LOCATIONS 0x218 TO 0x21B

CHANNEL ASSIGNMENT

MEMORY LOCATIONS 0x220 TO 0x223

RESULT MEMORY LOCATIONS 0x030 TO 0x033

0.01µF

CH8

CH9

3-WIRE PT-200

Table 43. Channel Assignment Data for 3-Wire RTD (PT-200, RSENSE on CH7, 3-Wire, 50µA Excitation Current, α = 0.003911 Curve)

CONFIGURATION

FIELD

DESCRIPTION # BITS

BINARY DATA

MEMORY

ADDRESS 0x220

MEMORY

ADDRESS 0x221

MEMORY

ADDRESS 0x222

MEMORY

ADDRESS 0x223

(1) RTD TYPE

PT-200

01101 0 1 1 0 1

(2) Sense

Resistor Channel

Pointer

CH7

00111

0 0 1 1 1

(3) Sensor

Configuration

3-Wire

0100

0 1 0 0

(4) Excitation

Current

50µA

0100

0 1 0 0

(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 44. Channel Assignment Data for Sense Resistor (Value = 12150.39Ω)

CONFIGURATION

FIELD

DESCRIPTION # BITS

BINARY DATA

MEMORY

ADDRESS 0x218

MEMORY

ADDRESS 0x219

MEMORY

ADDRESS 0x21A

MEMORY

ADDRESS 0x21B

(1) Sensor Type Sense Resistor

11101 1 1 1 0 1

(2) Sense Resistor

Value

12150.39Ω

27 000101111011101100110001111

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

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