BLF driver DDm-K2 [rev01a][untested]

by DEL.
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2 layer board of 1.34x1.34 inches (33.99x33.99 mm).
Shared on April 2nd, 2017 17:32.

DDm driver for Solarstorm/Fandyfire K2 lights.

Revision changes

  • Full size SOT-89 pads for the 7135
  • Unmasked L+ vias, to be solder-filled

Needs the DDm-K2-SW daughter board for the tactile switch and indicator LEDs:

https://oshpark.com/shared_projects/E7YKjPjG

‘Standard’ DDm parts list, except for:

  • R1 and R2 are populated if MCU pin 7 is used for cell voltage monitoring. This could, however, be done using the software-only method of Vcc vs. the internal 1.1 V reference.
  • R7 is populated when re-purposing pin 7 to drive a second indicator LED, as per the stock driver.
  • There is an R1 on the back of the switch board. A jumper here rewires the two indicator LEDs in parallel, both to be driven from MCU pin 3.

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