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Correct backlight on state docs (#6358)

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* Correct backlight on state docs

* Reword to make it less confusing
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fauxpark 2019-07-19 00:45:00 +10:00 committed by MechMerlin
parent d5b01bd34b
commit 5b4187ad1b
1 changed files with 4 additions and 2 deletions
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docs/feature_backlight.md
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@ -73,8 +73,10 @@ To change the behaviour of the backlighting, `#define` these in your `config.h`:
## Backlight On State ## Backlight On State
Most backlight circuits are driven by an N-channel MOSFET or NPN transistor. This means that to turn the transistor *on* and light the LEDs, you must drive the backlight pin, connected to the gate or base, *low*. Most backlight circuits are driven by an N-channel MOSFET or NPN transistor. This means that to turn the transistor *on* and light the LEDs, you must drive the backlight pin, connected to the gate or base, *high*.
Sometimes, however, a P-channel MOSFET, or a PNP transistor is used. In this case you must `#define BACKLIGHT_ON_STATE 1`, so that when the transistor is on, the pin is driven *high* instead. Sometimes, however, a P-channel MOSFET, or a PNP transistor is used. In this case, when the transistor is on, the pin is driven *low* instead.
This functionality is configured at the keyboard level with the `BACKLIGHT_ON_STATE` define.
## Multiple backlight pins ## Multiple backlight pins