MAX31865 データシートの表示（PDF） - Maxim Integrated

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MAX31865

RTD-to-Digital Converter

Maxim Integrated 

MAX31865

RTD-to-Digital Converter

ADC Code = 15-bit ADC results from RTD Data registers

(01h–02h)

RREF = Resistance of the reference resistor

Once the resistance of the RTD is known, the well-

defined resistive properties of the selected RTD can be

used to determine temperature by either calculations or

lookup tables.

In the typical case of a PT100 RTD with a 400I high

precision low drift reference resistor, Table 9 shows

examples of temperature and resistance values with the

corresponding ADC code results.

Table 9. Temperature Example for PT100 with 400I RREF

TEMPERATURE

(°C)

-200

-175

-150

-125

-100

-75

-50

-40

-30

-20

-10

0

10

20

30

40

50

60

70

80

90

100

110

120

130

140

150

160

170

180

190

200

225

250

RTD RESISTANCE

(ω)

18.52

29.22

39.72

50.06

60.26

70.33

80.31

84.27

88.22

92.16

96.09

100.00

103.90

107.79

111.67

115.54

119.40

123.24

127.08

130.90

134.71

138.51

142.29

146.07

149.83

153.58

157.33

161.05

164.77

168.48

172.17

175.86

185.01

194.10

RTD DATA REG

(01h-02h) (hex)

0BDAh

12B4h

196Ch

200Ah

2690h

2D04h

3366h

35EEh

3876h

3AFCh

3D7Eh

4000h

4280h

44FCh

4778h

49F2h

4C6Ah

4EE0h

5154h

53C6h

5636h

58A4h

5B12h

5D7Ch

5FE4h

624Ch

64B0h

6714h

6974h

6BD4h

6E30h

708Ch

7668h

7C3Ah

ADC CODE (dec)

1517

2394

3254

4101

4936

5762

6579

6903

7227

7550

7871

8192

8512

8830

9148

9465

9781

10096

10410

10723

11035

11346

11657

11966

12274

12582

12888

13194

13498

13802

14104

14406

15156

15901

ADC CODE/32-256

(°C)

-208.59

-181.19

-154.31

-127.84

-101.75

-75.94

-50.41

-40.28

-30.16

-20.06

-10.03

0.00

10.00

19.94

29.88

39.78

49.66

59.50

69.31

79.09

88.84

98.56

108.28

117.94

127.56

137.19

146.75

156.31

165.81

175.31

184.75

194.19

217.63

240.91

Maxim Integrated

  19

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