Cirrus Logic CDB5480U, General Description Manual

Page: 24 / 47

CDB5480U
24 DS893DB5
2.5.1.16 V1/V2 Sag, V1/ V2 Swell, and I1/I2 Overcurrent Registers
The registers for voltage sag, voltage swell, and overcurrent are displayed in the V1 Sag , V2 Sag , V1
Swell , V2 Swell , I1 Overcurrent , and I2 Overcurrent Register sections. These sections display the level
and duration values of the corresponding registers in both hexadecimal and decimal format. Each register
can be modified by typing a value in the corresponding decimal or
HEX: field. Refer to the CS5480 data
sheet for detailed descriptions of these registers.
2.5.1.17 Channel Selection Level, Channel Select Minimum Amplitude, and Voltage Fixed RMS Refer-
ence Registers
There are three register sections dedicated for setting anti-tampering features of the CS5480: Channel
Selection Level (
Ichan
LEVEL
), Channel Select Minimum Amplitude ( P
MIN
( IRMS
MIN
)) and Voltage Fixed
RMS Reference register ( VF
RMS
). Each register can be modified by typing a value in the corresponding
decimal or HEX fields. The Channel Selection Level register section is used to make changes to and
display the contents of the CS5480's
Ichan
LEVEL
register. The Channel Selection Level register sets the
hysteresis level for automatic energy channel selection. The Channel Select Minimum Amplitude register
P
MIN
( IRMS
MIN
) section is used to make changes to and display the contents of the CS5480's Channel
Select Minimum Amplitude register. The Channel Select Minimum Amplitude register sets the minimum
level for automatic energy channel selection. The Voltage Fixed RMS Reference register section is used
to make changes to and display the contents of the CS5480's
VF
RMS
register. When voltage tampering
is detected, the VF
RMS
register contains the internal voltage RMS reference used in the active power
calculations.
2.5.1.18 Register Checksum, SerialCtrl Registers
The Register Checksum and SerialCtrl Register boxes provide control and status of critical serial port
communication parameters and the register checksum. The SerialCtrl Register section provides control
over RX pin, baud rate, and enabling checksum protection for serial communication. The Register
Checksum section provides the calculated checksum of the critical registers inside the CS5480. The
register checksum updates automatically after single or continuous conversion has been performed. The
RegChk and SerialCtrl registers are displayed in hexadecimal form. Please note that if the opto-couplers
are selected as the isolation (J18, J20), the maximum baud rate is 2400.
The baud rate field applies only to UART serial communication and can be changed by the pull-down field.
It is recommended to set the baud rate setting to the highest setting possible. The default setting of 600
baud will cause some GUI functions to overflow the communication buffer and not function correctly.
2.6 Calibration Window
The Calibration window is used to display and write to the CS5480 offset and gain calibration registers. It
is also possible to initiate the CS5480's calibration sequences that are used to set the calibration values.
AC offset, DC offset, and gain calibrations can be performed on either the voltage channel or the current
channel, or both simultaneously. Refer to the CS5480 data sheet for more details on calibration. See
Figure 20.