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

Pin Configuration

TOP VIEW

15 14 13 12 11

GND1 16

N.C. 17

DRDY 18

DVDD 19

VDD 20

+

MAX31865

EP

1 2345

10 GND2

9 FORCE-

8 RTDIN-

7 RTDIN+

6 FORCE2

TQFN

(5mm x 5mm)

Pin Description

PIN

NAME

FUNCTION

1

BIAS Bias Voltage Output (VBIAS)

2

REFIN+

Positive Reference Voltage Input. Connect to BIAS. Connect the reference resistor between REFIN+

and REFIN-.

3

REFIN- Negative Reference Voltage Input. Connect the reference resistor between REFIN+ and REFIN-.

4

ISENSOR Low Side of RREF. Connect to REFIN-.

5

FORCE+

High-Side RTD Drive. Connect to FORCE2 when using the 3-wire connection configuration. Protected to

Q50V.

6

FORCE2

Positive Input Used in 3-Wire Only. When in the 3-wire connection configuration, connect to FORCE+.

When in the 2-wire or 4-wire connection configuration, connect to ground. Protected to Q50V.

7

RTDIN+ Positive RTD Input. Protected to Q50V.

8

RTDIN- Negative RTD Input. Protected to Q50V.

9

FORCE- Low-Side RTD Return. Protected to Q50V.

10

GND2 Analog Ground. Connect to GND1.

11

SDI Serial-Data Input

12

SCLK Serial-Data Clock Input

13

CS

Active-Low Chip Select. Set CS low to enable the serial interface.

14

SDO Serial-Data Output

Maxim Integrated

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