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Mainboard: Add RTC battery information #45

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Mainboard: Add RTC battery information #45

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28 changes: 28 additions & 0 deletions Mainboard/README.md
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Expand Up @@ -254,3 +254,31 @@ as "JST SH", and has a 1.0 mm pitch. The same connector is used for the Speakers
| 2 | FAN_SPEED |
| 3 | FAN_PWM |
| 4 | GND |

## RTC Battery Interface

NOTE: The mainboard will charge this battery, so a rechargable ML1220 battery MUST be used.
For example, CR2032 MUST NOT be used, it cannot be charged and will likely be damaged.

RTC battery is used for storing persistent but resettable information.
This includes the time and DRAM training. Disconnection will result in deletion of that information.
If no battery is connection, DRAM training needs to happen on every boot, slowing down the boot process significantly.

### Onboard RTC Battery

Framework 13 Intel Core 11th through 13th Generation use an onboard coin cell battery as RTC.

We use the Lotes LOTES_AAA-BAT-046-K01 connector.

### RTC Battery Cable Connector

On AMD Platforms and starting with Framework 13 Intel Core Ultra Series 1, no RTC battery is included anymore.
Settings are kept alive by the normal system battery. The only case where an
RTC battery is recommended, is when the system is used in standalone mode (without a battery).

Cvilux CVILU_CI4402M1HRC-NH connector for the RTC Battery.

| Pin | Signal | Location |
|-----|-----------|----------|
| 1 | +RTCBATT | Left |
| 2 | GND | Right |
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