Add constant_current_range selector for LED driving
#6
Conversation
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
rtyley
force-pushed
the
add-constant-current-range-selector
branch
2 times, most recently
from
f331f24 to
5f6fb17
Compare
The AW9523 supports 256-step linear constant-current dimming when LED driving. As noted in the datasheet introduction, the maximum current can be configured: https://cdn-shop.adafruit.com/product-files/4886/AW9523+English+Datasheet.pdf > The default maximum current (IMAX) is 37mA, and IMAX can be changed in GCR > register. In Table 10 ("GCR, Global control register (11H)"), the datasheet explains that 4 possible current ranges can be selected - maintaining the 256-step granularity over a shorter current range: > D[1:0] is used to configure the max drive current of LED. AW9523B set max > current IMAX to 37mA(typical) default, and through register ISEL[1:0] can > set to IMAX×1/4,IMAX×2/4, IMAX×3/4,IMAX, so the 256 step dimming range changes. This change updates the `adafruit_aw9523.AW9523` class to have a `constant_current_range` selector field that can be used to set the register value. The 4 options are provided as constants (`AW9523_4_4_RANGE`, `AW9523_3_4_RANGE`, etc). An example of using this code would be: ``` aw = adafruit_aw9523.AW9523(i2c) aw.constant_current_range = adafruit_aw9523.AW9523_3_4_RANGE ```
rtyley
force-pushed
the
add-constant-current-range-selector
branch
from
5f6fb17 to
792c2b0
Compare
ladyada
approved these changes
Jun 28, 2022
adafruit-adabot
added a commit
to adafruit/Adafruit_CircuitPython_Bundle
that referenced
this pull request
Jun 30, 2022
Updating https://github.com/adafruit/Adafruit_CircuitPython_AW9523 to 1.1.0 from 1.0.6: > Merge pull request adafruit/Adafruit_CircuitPython_AW9523#6 from rtyley/add-constant-current-range-selector Updating https://github.com/adafruit/Adafruit_CircuitPython_DPS310 to 2.1.5 from 2.1.4: > Merge pull request adafruit/Adafruit_CircuitPython_DPS310#24 from tekktrik/dev/fix-units Updating https://github.com/adafruit/Adafruit_CircuitPython_GC_IOT_Core to 3.2.3 from 3.2.2: > Merge pull request adafruit/Adafruit_CircuitPython_GC_IOT_Core#26 from JulianOrteil/type-annotations
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
The AW9523 supports 256-step linear constant-current dimming when LED driving. As noted in the datasheet introduction, the maximum current can be configured:
https://cdn-shop.adafruit.com/product-files/4886/AW9523+English+Datasheet.pdf
In Table 10 ("GCR, Global control register (11H)"), the datasheet explains that 4 possible current ranges can be selected - maintaining the 256-step granularity over a shorter current range:
This change updates the
adafruit_aw9523.AW9523class to have aconstant_current_rangeselector field that can be used to set the register value. The 4 options are provided as constants (AW9523_4_4_RANGE,AW9523_3_4_RANGE, etc).An example of using this code would be:
cc @FoamyGuy