CDB5460A Datasheet, PDF (12/28 Pages) Cirrus Logic – Evaluation Board and Software

CDB5460A
2.4.6 Control Register
The Control Register contains various bits used to
activate or terminate various features of the
CS5460A. Refer to the CS5460A data sheet for de-
scription of the bits. The user is able to turn each bit
on or off individually. The value of the Control
Register is displayed in HEX. Note that the Con-
trol Register, like all other CS5460A registers, is
24 bits long. Most of these bits are reserved or un-
used. Only the usable bits are displayed in the Set-
up Window.
2.5 Calibration Window
The Calibration Window is used to display and
write to the CS5460A offset and gain calibration
registers. The user is also able to initiate the
CS5460A’s calibration sequences that are used to
set the calibration values. Both AC and DC cali-
brations can be run for offset and gain, for either the
voltage channel or the current channel, or both si-
multaneously. The user should refer to the
CS5460A data sheet for more details on calibra-
tion.
2.5.1 Offset / Gain Register
In the Offset and Gain Register boxes, the offset
and gain registers for both channels are displayed
in hexadecimal and decimal. These registers can all
be modified directly by typing the desired value in
the hexadecimal display boxes. There are two
types of offset registers: DC offset and AC offset.
The AC offset registers only affect the RMS-regis-
ter values. Note that the RMS offset registers only
hold positive values between 0 and +1. The DC
offset register is a two’s complement number
whose value ranges from -1 to +1.
2.5.2 Performing Calibrations
Offset and gain calibrations can be performed on
both the voltage and current channels of the
CS5460A. It is generally a good idea to software-
reset the CS5460A before running calibrations, be-
cause the values in the calibration registers will af-
fect the results of the calibration. A software reset
Figure 3. Calibration Window
12