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MAX31865AAP+ PDF预览

MAX31865AAP+

更新时间: 2024-11-26 13:10:27
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美信 - MAXIM 转换器
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25页 1588K
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MAX31865AAP+ 数据手册

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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 100to 1k(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  
S
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  
V
V
DD  
DD  
0.1µF  
0.1µF  
BIAS  
R
REFIN+  
REF  
DRDY  
SDI  
REFIN-  
ISENSOR  
R
R
CABLE  
MAX31865  
HOST  
SCLK  
CS  
FORCE+  
FORCE2  
INTERFACE  
CABLE  
SDO  
N.C.  
RTDIN+  
C *  
I
RTD  
R
CABLE  
CABLE  
RTDIN-  
FORCE-  
*C = 10nF FOR 1kRTD  
I
R
100nF FOR 100RTD  
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  

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