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MAX31865

RTD-to-Digital Converter

Maxim Integrated 

MAX31865

RTD-to-Digital Converter

RTD Resistance Registers (01h−02h)

Two 8-bit registers, RTD MSBs and RTD LSBs, contain

the RTD resistance data. The data format is shown in

Table 4. The data format is simply the 15-bit ratio of RTD

resistance to reference resistance. D0 of the RTD LSBs

register is a Fault bit that indicates whether any RTD

faults have been detected.

Table 4. RTD Resistance Registers Definition

REGISTER

RTD MSBS (01h) REGISTER

RTD LSBS (02h) REGISTER

Bit

D7 D6 D5 D4 D3 D2 D1 D0 D7 D6 D5 D4 D3 D2 D1 D0

RTD

Resistance MSB — — — — — — — — — — — — — LSB Fault

Data

Bit

Weighting

214

213 212 211 210

29

28

27

26

25

24

23

22

21

20

—

Decimal

Value

16384 8192 4096 2048 1024 512 256 128 64 32 16

8

4

2

1

—

Table 5. RTD Resistance-Data Relationship

RRTD/RREF

0.025

BINARY

RTD MSBs (01h) RTD LSBs (02h)

0000 0110

0110 0110b

0.125

0.25

0010 0000

0100 0000

0000 0000b

0000 0000b

0.50

1000 0000

0000 0000b

0.75

1100 0000

0000 0000b

0.999

1111 1111

1111 1110b

Note: D0 (“Fault”) is assumed to be 0.

HEX

RTD MSBs (01h) RTD LSBs (02h)

06h

66h

20h

00h

40h

00h

80h

00h

C0h

00h

FFh

FEh

DECIMAL

819

4096

8192

16,384

24,576

32,767

Maxim Integrated

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