pinout.vvzero.com/draft/overlay/rtc.md

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<!--
---
name: Adafruit PiRTC
class: board
type: RTC
formfactor: Custom
manufacturer: Adafruit
description: Add a simple RTC to your pi
url: https://learn.adafruit.com/adding-a-real-time-clock-to-raspberry-pi/set-up-and-test-i2c
buy: https://www.adafruit.com/products/3386
image: rtc.png
pincount: 6
eeprom: no
power:
'1':
ground:
'6':
pin:
'3':
mode:SDA
'5':
mode:SCL
i2c:
'0x68':
name: PCF8523
device: PCF8523
-->
#Adafruit PiRTC
This is a great battery-backed real time clock (RTC) that allows your Raspberry Pi project to
keep track of time if the power is lost. Perfect for data-logging, clock-building, time-stamping,
timers and alarms, etc. Equipped with PCF8523 RTC, it works great with the Raspberry Pi and has native
kernel support.
This RTC will keep the time for about 5 years. The PCF8523 is simple and inexpensive but not a high
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precision device. It may lose or gain a second or two per day.