Texas Instruments BUF16821EVM-USB, User Manual, Page: 19 / 33

V =
CHANNEL
V Code
1024
SUP
?
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BUF16821EVM-USB Software Overview
19 SBOU106A – May 2011 – Revised May 2016
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BUF16821EVM-USB Evaluation Board and Software Tutorial
5.2.2 Measuring the Power Supply
You must measure the power supply (V
S
) with respect to the GND on the BUF16821EVM-USB test board
and enter it in the V
SUP
field located in the top section of the software interface, as shown in Figure 17 .
Figure 17. Measuring and Entering Power-Supply Voltage
The voltages calculated for each channel are based on the value entered as V
SUP
, as shown in Equation 1 .
Note that Code is the value found in the channel registry converted to decimal format.
(1)
5.2.3 Read DAC Button
By pressing the Read DAC button in the BUF16821EVM-USB software, all of the BUF16821 DAC/V
COM
registers are read to obtain the respective current register contents. Once the read procedure is complete,
all of the corresponding text boxes are updated to show the current values present in the DAC/V
COM
registers.