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Rounded-rectangle pads
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accessories/making-accessories.md

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@@ -30,15 +30,15 @@ The edge connector on the <span class="V2">V2</span> board revision is backwards
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## Battery Pads
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There are two elongated pads on the back of the micro:bit. These allow you to connect a battery holder directly, instead of via the JST connector.
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There are two rounded-rectangle pads on the back of the micro:bit. These allow you to connect a battery holder directly, instead of via the JST connector.
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![Picture of the two elongated pads](/docs/accessories/assets/making-accessories-d7c25.png)
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![Picture of the two rounded-rectangle pads](/docs/accessories/assets/making-accessories-d7c25.png)
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### V2 revision
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In the <span class="v2">V2</span> board revision, the 3V lozenge is connected to the 3V ring on the edge connector.
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- If you make an accessory that uses the elongated pads, it must be protected from reverse charging when the board is powered by USB, battery or edge connector.
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- You can now source power from the elongated pads if you are making an accessory. They are consistent with the power architecture of the edge connector.
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- If you make an accessory that uses the rounded-rectangle pads, it must be protected from reverse charging when the board is powered by USB, battery or edge connector.
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- You can now source power from the rounded-rectangle pads if you are making an accessory. They are consistent with the power architecture of the edge connector.
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Due to the addition of a speaker, current accessories that use the elongated pads to power the micro:bit will no longer fit.
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Due to the addition of a speaker, current accessories that use the rounded-rectangle pads to power the micro:bit will no longer fit.

hardware/powersupply.md

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- USB connection via the interface chip (which has an on-board regulator)
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- A battery plugged into the JST connector
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- The 3V and GND pins on the edge connector
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- The two elongated pads on the rear right of the board
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- The two rounded-rectangle pads on the rear right of the board
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Power from the micro:bit can be provided by the 3V and GND pins to small external circuits.
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### 3V Ring Powering
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The micro:bit may be powered from the 3V/GND rings on the edge connector.
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There are also two elongated pads on the far right of the back of the PCB that can be used to supply power (e.g. solderable pads for a 2xAAA holder that has wires or pins at one edge). [The topmost pad is 0V and the bottom most pad is 3V](../../accessories/making-accessories/#battery-pads).
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There are also two rounded-rectangle pads on the far right of the back of the PCB that can be used to supply power (e.g. solderable pads for a 2xAAA holder that has wires or pins at one edge). [The topmost pad is 0V and the bottom most pad is 3V](../../accessories/making-accessories/#battery-pads).
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When powering from the 3V ring or the elongated pads on the PCB, you should take appropriate best practice precautions:
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When powering from the 3V ring or the rounded-rectangle pads on the PCB, you should take appropriate best practice precautions:
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1. Fit an external protection diode (preferably with a low Vf rating) to prevent damage due to the power supply being connected the wrong way round.
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latest-revision/latest-revision-accessories.md

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### Power
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The micro:bit can now be powered from the two losenge shaped pads on the rear of the board and the 3V/GND pins.
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The micro:bit can now be powered from the two rounded-rectangle pads on the rear of the board and the 3V/GND pins.
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If you use the losenge pads, you must diode (or otherwise) protect themselves from the micro:bit having power via another source. This was still necessary on the previous revision when the board was powered from battery, but is now true for USB and edge-connector power also.
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If you use the rounded-rectangle pads, you must diode (or otherwise) protect themselves from the micro:bit having power via another source. This was still necessary on the previous revision when the board was powered from battery, but is now true for USB and edge-connector power also.
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The nRF52 supplies 300mA to drive the board. 110mA is reserved for powering on-board components. **190mA** is then available for accessories.
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