The RTC has two time-of-day alarms that can be set to wake up the main TinyDuino
processor from sleep (very useful in long term data logging applications) and will
automatically switch to using the backup battery upon power loss. The backup battery is a
rechargeable Lithium coin cell which is soldered onto the TinyShield and will keep the RTC
time for 2.5 years before being recharged. Trickle charging of the backup battery can be
enabled using a software command.
To learn more about the TinyDuino Platform, click here
https://tinycircuits.com/pages/tinyduino-overview
TECHNICAL DETAILS
To see what other TinyShields this will work with or conflict with, check out
the TinyShield Compatibility Matrix
Maxim DS1339 Real-Time Clock (RTC) Specs
o Real-Time Clock (RTC) Counts Seconds, Minutes, Hours, Day, Date, Month, and Year
with Leap-Year Compensation Valid Up to 2100
o Two Time-of-Day Alarms
o Oscillator Stop Flag
o Automatic Power-Fail Detect and Switch Circuitry
o Backup battery trickle charge (software controlled)
TinyDuino Power Requirements
o Voltage: 3.0V - 5.5V
o Current: 450uA (Active Mode). Due to the low current, this board can be run using the
TinyDuino coin cell option
o Built in Backup Battery
o 11mAh rechargeable Lithium 3.0V backup battery.
o Provides 2.5 years of timekeeping backup
o Backup battery trickle charging under software control
