Texas Instruments OPT3006, User Manual

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12 SBOU181 – October 2016
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OPT3006EVM User's Guide
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
OPT3006 data sheet ) to compute the lux output, labeled Reg x00 Lux in Figure 13 . Click the Read
Reg x00 button to update these fields and the plot with the latest values from the OPT3006EVM.
Figure 13. Register x00 Button and Recorded Values
Register x01 configures the OPT3006 and provides feedback about the state of the device; the bit names
and full descriptions are shown in the
OPT3006 data sheet . Each of the configurable, read and write bits
has a drop-down menu to select the appropriate value. Each of the read-only status bits has an
associated small, green indicator. As shown in
Figure 14 , two buttons are provided to operate register x01
because some of the bits have read and write capability. Note that in Figure 14 , the Lux Full Scale Range
selection field has four identical automatic range modes: 0x0C-0x0F. Also, the Mode selection field has
two identical continuous sampling options: 0x02 and 0x03.
Figure 14. Register x01 Control and Status Register Bits
Registers x02 and x03 enforce low and high limits, respectively, on the output ranges (exponent) and
values (mantissa) from the OPT3006. These registers are programmed with the appropriate fields, as
shown in
Figure 15 . Change the values of the data in these fields to write and read the values from the
OPT3006; no button press is required. However, if values are manually entered, exit the text field for the
field to update.
Figure 15. Registers x02 and x03 Lux Limit Controls
There is a simulated screen backlight dimmer represented by a rectangle, shown in Figure 16 . This
rectangle changes from black, through 254 shades of grey, to white depending on the value of lux
measured by the OPT3006. It shows a brighter backlight for high-lux situations and a dim backlight for
low-lux situations. The low limit (darkest backlight) is always 0, and the high limit (brightest backlight) can
be adjusted with the
Lux for White numeric field.
Figure 16. Simulated Screen Backlight Dimmer