MAX31865AAP+

更新时间： 2024-11-04 13:10:27

品牌	Logo	应用领域
美信 - MAXIM		转换器
页数	文件大小	规格书
25页	1588K
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数据手册

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MAX31865AAP+ 数据手册

EVALUATION KIT AVAILABLE

MAX31865

RTD-to-Digital Converter

Features

General Description

The MAX31865 is an easy-to-use resistance-to-digital

converter optimized for platinum resistance temperature

detectors (RTDs). An external resistor sets the sensitivity

for the RTD being used and a precision delta-sigma ADC

converts the ratio of the RTD resistance to the reference

resistance into digital form. The MAX31865’s inputs are

protected against overvoltage faults as large as Q50V.

Programmable detection of RTD and cable open and

short conditions is included.

S Simple Conversion of Platinum RTD Resistance to

Digital Value

S Handles 100Ω to 1kΩ (at 0°C) Platinum RTDs

(PT100 to PT1000)

S Compatible with 2-, 3-, and 4-wire Sensor Connections

S Conversion Time: 21ms max

S 15-Bit ADC Resolution; Nominal Temperature

Resolution 0.03125NC (Varies Due to RTD

Nonlinearity)

Applications

S Total Accuracy Over All Operating Conditions:

0.5NC (0.05% of Full Scale) max

Industrial Equipment

Medical Equipment

Instrumentation

50V ꢀnput Protection

S Fully Differential V

ꢀnputs

REF

S Fault Detection (Open RTD Element, RTD Shorted to

Ordering Information appears at end of data sheet.

Out-of-Range Voltage, or Short Across RTD Element)

S SPꢀ-Compatible ꢀnterface

S 20-Pin TQFN Package

For related parts and recommended products to use with this part,

refer to www.maximintegrated.com/MAX31865.related.

Typical Application Circuits

4-WIRE SENSOR CONNECTION

0.1µF

BIAS

REFIN+

REF

DRDY

SDI

REFIN-

ISENSOR

CABLE

MAX31865

HOST

SCLK

FORCE+

FORCE2

INTERFACE

CABLE

SDO

N.C.

RTDIN+

C *

RTD

CABLE

RTDIN-

FORCE-

*C = 10nF FOR 1kΩ RTD

100nF FOR 100Ω RTD

Typical Application Circuits continued at end of data sheet.

For pricing, delivery, and ordering information, please contact Maxim Direct

at 1-888-629-4642, or visit Maxim’s website at www.maximintegrated.com.

19-6478; Rev 0; 10/12

12 3 4 5 6 7...25

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