Cirrus Logic CDB5467U - Manual (Page 17)

CDB5467U
DS714DB1 17
2.6.3 Standby / Sleep Mode Buttons
When these buttons are pressed, the CS5467 will enter either standby or sleep power saving modes. To
return to normal mode, press the Power Up button.
2.6.4 Power Up Button
This button is used to send the Power Up/Halt command to the CS5467. The part will return to normal
operating mode and halt any conversions that are being done at this time.
2.6.5 Set Line Frequency
If the AFC bit in the Mode register is set, the Epsilon register will be calculated automatically by the
CS5467 and the Line Frequency display field will be updated automatically in continuous conversion
mode. If the AFC bit in the Mode register is not set and the line frequency is other than the default value
(50Hz), to ensure the accuracy of the quadrature power (Q1, Q2) and the reactive power (Q1avg, and
Q2avg), the line frequency must be set manually here to make Epsilon be the ratio of line frequency to
the output word rate (OWR). Refer to the CS5467 datasheet for more details.
2.6.6 Temperature Settings Window
The Temperature Settings Window is used to adjust the temperature offset register (Toffset) and temper-
ature gain register (Tgain) to convert the temperature register (T) from a Celsius scale (°C) to a Fahrenheit
scale (°F) or vice versa and to improve temperature measurement accuracy. Refer to the CS5467 data
sheet for the details of the on-chip temperature sensor.
2.6.7 Write Data to File Window
This window provides a means to write the conversion result data to a .txt text file for later analysis or
print out. The file path and name will be shown in Filename field. The Open File button is used to open a
new or existing .txt text file for data writing. Each time the Write Data button is pressed, the result data is
written into the file and the Number of Lines Written field value will be increased by 1.
2.6.8 Temperature Measurement
In the CS5467, voltage 2 and temperature are multiplexed on one ADC channel. To initiate a temperature
measurement, write 1 to the Tmeas register while in continuous conversion mode. When the Tmeas reg-
ister returns to 0, the Temperature field should be updated with the data in the T (Temperature) register.