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

DRDY

The DRDY output goes low when a new conversion result

is available in the RTD Data Registers. When a read-

operation of the RTD Data Registers completes, DRDY

returns high.

Applications Information

For operation in noisy environments, a filter capacitor

may be placed across the RTDIN+ and RTDIN- inputs.

After an overvoltage or undervoltage fault, after a fault

detection cycle, or after enabling VBIAS, always allow for

the settling time of the input filter before restarting the

ADC. A delay time of at least five time constants plus an

additional 1ms (for the protection devices to stabilize) is

recommended to achieve specified accuracy.

Converting RTD Data Register

Values to Temperature

The ratiometric ADC conversion results found in the RTD

Data Registers can be converted to temperature with a

few calculations.

First, the Resistance of the RTD needs to be determined

with the following equation:

RRTD = (ADC Code x RREF)/215

DRDY

RTD REGISTER

CONTENTS

CONVERSION n

CONVERSION n+1

CONVERSION n+2

CS

SDO

SDI

Figure 9. DRDY Operation

Maxim Integrated

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