1

DRDY

Active-Low, Push-Pull, Data-Ready Output.   DRDY goes low when a new conversion result is available in the data register.   When a read operation of an RTD resistance data register occurs, DRDY returns   high.

2

DVDD

Digital Supply Voltage Input. Connect to   a 3.3V power supply. Bypass to DGND with a 0.1μF bypass capacitor.

3

VDD

Analog Supply Voltage Input. Connect to a   3.3V power supply. Bypass to GND1 with a 0.1μF bypass capacitor.

4

BIAS

Bias Voltage Output (VBIAS)

5

REFIN+

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

6

REFIN-

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

7

ISENSOR

Low Side of RREF. Connect to REFIN-.

8

FORCE+

High-Side RTD Drive. Connect to FORCE2   when using the 3-wire connection configuration. Protected to ±45V.

9

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 ±45V.

10

RTDIN+

Positive RTD Input. Protected to ±45V.

11

RTDIN-

Negative RTD Input. Protected to ±45V.

12

FORCE-

Low-Side RTD Return. Protected to ±45V.

13

GND2

Analog Ground. Connect to GND1.

14

SDI

serial-Data lnput

15

SCLK

Serial-Data Clock Input

16

CS

Active-Low Chip Select. set Cs low to   enable the serial interface.

17

SDO

Serial-Data Output

18

DGND

Digital Ground

19

GND1

Analog Ground. Connect to GND2.

20

N.C.

Do Not Connect