AD7175-2 datasheet(49/63 Pages) AD

49 / 63 page

AD7175-2

Data Sheet

Rev. B | Page 48 of 62

IOSTRENGTH

The serial interface can operate with a power supply as low as

2 V. However, at this low voltage, the DOUT/RDY pin may not

have sufficient drive strength if there is moderate parasitic

capacitance on the board or the SCLK frequency is high. The

IOSTRENGTH bit in the interface mode register increases the

drive strength of the DOUT/RDY pin.

INTERNAL TEMPERATURE SENSOR

The AD7175-2 has an integrated temperature sensor. The

temperature sensor can be used as a guide for the ambient

temperature at which the part is operating. This can be used for

diagnostic purposes or as an indicator of when the application

circuit must rerun a calibration routine to take into account a

shift in operating temperature. The temperature sensor is

selected using the crosspoint multiplexer and is selected the

same as an analog input channel.

The temperature sensor requires the analog input buffers be

enabled on both analog inputs. It is recommend that the input

buffers are enabled, but this is not necessary for the

measurement.

To use the temperature sensor, the first step is to calibrate the

device in a known temperature (25°C) and take a conversion as

a reference point. The temperature sensor has a nominal

sensitivity of 470 µV/K; the difference in this ideal slope and the

slope measured can calibrate the temperature sensor. The

temperature sensor is specified with a ±2°C typical accuracy

after calibration at 25°C. The temperature can be calculated as

follows:

273

–

477

)

(

Result

Conversion

Temperatur

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