AD7175-2 datasheet(49/63 Pages) AD

49 / 63 page

Data Sheet

AD7175-2

Rev. A | Page 49 of 63

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DATA_STAT

The contents of the status register can be appended to each con-

version on the AD7175-2. This function is useful if several

channels are enabled. Each time a conversion is output, the

contents of the status register are appended. The two LSBs of

the status register indicate to which channel the conversion

corresponds. In addition, the user can determine if any errors

are being flagged by the error bits.

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 needs to re-run 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 that the analog input buffers be enabled on both analog

inputs. If the buffers are not enabled then selecting the

temperature sensor as an input forces the buffers to be enabled

during the conversion.

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 477 µV/K; the difference in this ideal slope and the

slope measured can be used to 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

–

μV

477

)

(













Result

Conversion

Temperatur

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