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|style="border-left:solid 2px #73B2C7; border-right:solid 2px #73B2C7;border-top:solid 2px #73B2C7; border-bottom:solid 2px #73B2C7; background-color:#edf8fb; padding:5px; color:#000000"|First documentation release
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__FORCETOC__
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== RTC ==
=== Description ===
RIALTO SBC uses an external I2C RTC device, i.e. M41T83SQA6F.
An external lithium battery (like Panasonic [https://industrial.panasonic.com/ww/products/batteries/secondary-batteries/coin_rechargeable_lithium/models/ML2020 ML-1220/V1AN] rechargeable battery) can be optionally mounted on RIALTO SBC.
[[File:RIALTO_SBC-Battery-connector.png|thumb|center| 500px|RTC Lithium battery]]
===Signals ===
The following table describes the interface signals:
{| class="wikitable"
! latexfontsize="scriptsize"| Pin#
! latexfontsize="scriptsize"| Pin name
! latexfontsize="scriptsize"| Pin function
! latexfontsize="scriptsize"| Pin Notes
|-
| 1 || RTC_LICELL || VBAT || coin cell battery network has to be properly configured for lithium battery recharge current
|-
| 2 || GND|| Ground ||
|}
=== Device mapping ===
RTC is mapped to <code>/dev/rtc0</code> device in Linux.
=== Device usage ===
The peripheral can be accessed through the <code>date</code> and <code>hwclock</code> linux commands.
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[[Category:RIALTO SBC]]