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Update split i2c docs for example of when pull-ups are required (#7143)

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Adam Perlman 2019-10-28 14:10:25 -04:00 committed by Joel Challis
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docs/feature_split_keyboard.md
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@ -47,7 +47,7 @@ The 3 wires of the TRS/TRRS cable need to connect GND, VCC, and D0 (aka PDO or p
The 4 wires of the TRRS cable need to connect GND, VCC, and SCL and SDA (aka PD0/pin 3 and PD1/pin 2, respectively) between the two Pro Micros. The 4 wires of the TRRS cable need to connect GND, VCC, and SCL and SDA (aka PD0/pin 3 and PD1/pin 2, respectively) between the two Pro Micros.
The pull-up resistors may be placed on either half. It is also possible to use 4 resistors and have the pull-ups in both halves, but this is unnecessary in simple use cases. The pull-up resistors may be placed on either half. If you wish to use the halves independently, it is also possible to use 4 resistors and have the pull-ups in both halves.
![I2C wiring](https://i.imgur.com/Hbzhc6E.png) ![I2C wiring](https://i.imgur.com/Hbzhc6E.png)