LTC2984 datasheet(38/78 Pages) AD

38 / 78 page

LTC2984

2984fb

For more information www.linear.com/LTC2984

Table 40. Channel Assignment Data for 2-Wire RTD #1 (PT-1000, RSENSE on CH16, 2-Wire, Shared RSENSE, 10µA Excitation Current,

α = 0.003916 Curve)

CONFIGURATION

FIELD

DESCRIPTION # BITS BINARY DATA

MEMORY

ADDRESS 0x244

MEMORY

ADDRESS 0x245

MEMORY

ADDRESS 0x246

MEMORY

ADDRESS 0x247

(1) RTD TYPE

PT-1000

01111 0 1 1 1 1

(2) Sense Resistor

Channel Pointer

CH16

10000

1 0 0 0 0

(3) Sensor

Configuration

2-Wire with

Shared RSENSE

0001

0 0 0 1

(4) Excitation

Current

10µA

0010

0 0 1 0

(5) Curve

Japanese,

α = 0.003916

1 0

(6) Custom RTD

Data Pointer

Not Custom

000000000000

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

Figure 12. Shared 2-Wire RTD Example

RSENSE

5001.5

0.01µF

2984 F12

0.01µF

SENSE RESISTOR ASSIGNED TO CH16 (CHRSENSE=16)

RTD #1 ASSIGNED TO CH18 (CHRTD=18)

RTD #2 ASSIGNED TO CH20 (CHRTD=20)

CH20

CH19

CH16

CH15

CHANNEL ASSIGNMENT

MEMORY LOCATIONS 0x23C TO 0x23F

CHANNEL ASSIGNMENT

MEMORY LOCATIONS 0x244 TO 0x247

RESULT MEMORY LOCATIONS 0x054 TO 0x057

CHANNEL ASSIGNMENT

MEMORY LOCATIONS 0x24C TO 0x24F

RESULT MEMORY LOCATIONS 0x05C TO 0x05F

0.01µF

CH17

CH18

0.01µF

2-WIRE PT-1000

2-WIRE NI-120

APPLICATIONS INFORMATION

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