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Software
3.4.2
Feature Descriptions
Register x00 is a read-only register that holds the range and converted value. These data are used (per
the
OPT3002 data
button to update these fields and the plot with the latest values from the OPT3002EVM.
Register x01 configures the OPT3002 device and provides feedback about the state of the device; the bit
names and full descriptions are shown in the
register bits for register x01. All the configurable read-and-write bits have a drop-down menu to select the
appropriate value. All the read-only status bits have an associated small, blue indicator. Two buttons are
provided to operate register x01 because some of the bits have read and write capability. The Full Scale
Range selection field has four identical automatic range modes: 0x0C, 0x0D, 0x0E, and 0x0F. Also, the
Mode selection field has two identical continuous sampling options: 0x02 and 0x03.
Registers x02 and x03 enforce low and high limits, respectively, on the output ranges (exponent) and
values (mantissa) from the OPT3002. These registers are programmed using the appropriate fields, as
shown in
Figure
14. Change the values of the data in these fields to write and read the values from the
OPT3002. No button press is required; however, make sure to exit the text field for the field to update.
There is a simulated screen backlight dimmer represented by a rectangle, shown in
rectangle changes from black, through 254 shades of grey, to white, depending on the value of the output
measured by the OPT3002. The rectangle shows a brighter backlight for high-output situations, and a dim
backlight for low-output situations. The low limit (darkest backlight) is always 0, and the high limit
(brightest backlight) can be adjusted with the LSB for White numeric field.
10
OPT3002EVM User's Guide
sheet) to compute the output, labeled Reg x00 in
Figure 12. Register x00 Button and Recorded Values
Figure 13. Register x01 Control and Status Register Bits
Figure 14. Registers x02 and x03 LSB Limit Controls
Figure 15. Simulated Screen Backlight Dimmer
Copyright © 2016, Texas Instruments Incorporated
Figure
OPT3002 data
sheet.
Figure 13
www.ti.com
12. Click the Read Reg x00
shows the control and status
Figure
15. This
SBOU160 – May 2016
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