LTC2995 datasheet(39/90 Pages) AD

39 / 90 page

LTM2985

Rev. 0

For more information www.analog.com

Table 40. Channel Assignment Data for 2-Wire RTD #1 (PT-1000, RSENSE on CH6, 2-Wire, Shared RSENSE, 10µA Excitation Current,

α = 0.003916 Curve)

CONFIGURATION

FIELD

DESCRIPTION # BITS BINARY DATA

MEMORY

ADDRESS 0x21C

MEMORY

ADDRESS 0x21D

MEMORY

ADDRESS 0x21E

MEMORY

ADDRESS 0x21F

(1) RTD TYPE

PT-1000

01111 0 1 1 1 1

(2) Sense Resistor

Channel Pointer

CH6

00110

0 0 1 1 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

2985 F12

0.01µF

SENSE RESISTOR ASSIGNED TO CH6 (CHRSENSE=6)

RTD #1 ASSIGNED TO CH8 (CHRTD=8)

RTD #2 ASSIGNED TO CH10 (CHRTD=10)

CH10

CH9

CH6

CH5

CHANNEL ASSIGNMENT

MEMORY LOCATIONS 0x214 TO 0x217

CHANNEL ASSIGNMENT

MEMORY LOCATIONS 0x21C TO 0x21F

RESULT MEMORY LOCATIONS 0x02C TO 0x02F

CHANNEL ASSIGNMENT

MEMORY LOCATIONS 0x224 TO 0x227

RESULT MEMORY LOCATIONS 0x034 TO 0x037

0.01µF

CH7

CH8

0.01µF

2-WIRE PT-1000

2-WIRE NI-120

APPLICATIONS INFORMATION

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