@@ -96,7 +96,7 @@ The crystal will resonate at a specified frequency. Its waveform will be used as
- Find the device/Crystal.
- Place it close to `PH0` and `PH1`, pin 5 and 6 (`RCC_OS_CIN` and `RCC_OSC_OUT`).
- Connect the component with wires to the mentioned pins. Value 12MHz.
- Connect one 22p capacitor to each pin on the crystal and connect the other end of the capacitors to GND.
- Connect one 22pF capacitor to each pin on the crystal and connect the other end of the capacitors to GND.
### 7) Serial Wire Debug (SWD) connector
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@@ -117,7 +117,7 @@ One easy way to get power to your project is through USB. It can deliver up to 1
### 9) 3.3v Power Supply
The MCU needs a stable voltage. A common for digital components is 3.3v. To this end we will use a fixed LDO (low dropout) regulator, with a 5v input (powered from the USB connector) and 3.3v output. We will use the [AP2125N-3.3TRG1](https://www.elfa.se/en/ldo-voltage-regulator-3v-360ma-sot-23-diodes-incorporated-ap2125n-3trg1/p/30041163)
The MCU wants to be powered from a 3.3V rail. To this end we will use a fixed LDO (low dropout) linear regulator, to convert a 5V input (from the USB connector) to a 3.3V output. We will use the [AP2125N-3.3TRG1](https://www.elfa.se/en/ldo-voltage-regulator-3v-360ma-sot-23-diodes-incorporated-ap2125n-3trg1/p/30041163) for this.
Look in the [datasheet](https://www.elfa.se/Web/Downloads/_t/ds/AP2125_eng_tds.pdf) for a typical application circuit. Later we will design the power supply for the PWM3389 sensor, which is a bit trickier.
