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 Description (continued)

PIN

NAME

FUNCTION

15

DGND Digital Ground

16

GND1 Analog Ground. Connect to GND2.

17

N.C. Do Not Connect

18

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.

19

DVDD

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

capacitor.

20

VDD

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

capacitor.

—

EP

Exposed Pad (Bottom Side of Package). Connect to GND1.

Block Diagram

BIAS

REFIN+

REFIN-

ISENSOR

VBIAS

GENERATOR

VDD

VDD

FORCE+

FORCE2

RTDIN+

3-WIRE

ONLY

15-BIT

Σ∆ ADC

±50V PROTECTION

RTDIN-

FORCE-

GND2 GND1

DVDD

VDVDD

DATA REGISTERS

SERIAL

LOGIC

SCLK

SDO

SDI

CS

DIGITAL LOGIC

50/60Hz DIGITAL

SINC FILTER

DIGITAL

COMPARATOR

FOR

FAULT DETECTION

MASTER-INITIATED

FAULT-DETECTION

CYCLE

ADC STATE

MACHINE

DRDY

MAX31865

DGND

Maxim Integrated

  8

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