Standalone Meter Application; Figure 9. Standalone Power Meter Measurements - Cirrus Logic CDB5490U Manual

1.7

Standalone Meter Application

The CDB5490U evaluation board provides a standalone power meter using the CS5490, MCU, and LCD.
The user can enable the power meter by connecting the sensors to the analog inputs, providing power to
the board, and resetting the MCU by pressing the RESET switch. Refer to "Typical Sensor Connections"
on page 12 for details on the sensor connections and "Power Supply Section" on page 11 for details on
supply options.
The user should not use the GUI to connect the CDB5490U board. Once the GUI is connected to the
CDB5490U board, the standalone power meter function is disabled, and the LCD on the CDB5490U will
read "Cirrus Logic CS5490 Eval GUI". To re-enable the standalone power meter feature, close the GUI
software. The standalone power meter feature will initially show the voltage channels' RMS register val-
ues:
By clicking the onboard switch S2, the standalone power meter will display the following measurement
results:
1. RMS Voltage
2. RMS Current
3. Average Active Power
4. Average Reactive Power
5. Average Apparent Power
6. Power Factor
7. Total Active Power
8. Total Reactive Power
9. Total Apparent Power
10. Fundamental Frequency
11. CS5490 Die Temperature
DS923DB5
V1 = N.NNNNN and V2
rms

Figure 9. Standalone Power Meter Measurements

= N.NNNNN.
rms
CDB5490U
15