User manual

AREXX Engineering & JM3 Engineering
Version: 1.05 Nov. 9
th
, 2014 page: 8
2.4. Demo Software
A demo software for the ASURO xTend board is available which displays the date and time on the
display.
To enable the display function you have to make a change the Makefile - in the Global Defines section
you should have IOEXT_RTC defined.
# Global Defines
#
# Enable demo program for connected sensor module.
DEFINES = IOEXT_RTC
2.5. Setting time and date
The demo software provides a function which allows reading and setting the time and date via USB
interface.
2.6. Slave Address
RTCLOCK = 0xD0 // DS1339U
3. Technical Data
VDD ≤ 10.0 V
≥ 3.3 V
IDD ≤ 1.0 mA (peak)
≤ 0.4 mA (standby)
Temperature Range: -10 to 65 °C
Key Features of the DS1339U:
 Real-Time Clock (RTC) Counts Seconds, Minutes, Hours, Day, Date, Month, and Year with
Leap-Year Compensation Valid Up to 2100
 Two Time-of-Day Alarms
 Programmable Square-Wave Output
 Oscillator Stop Flag
 Automatic Power-Fail detection and switch circuitry
 Trickle-Charger
Hint: There should be no need to replace this battery! Recharging will occur during
normal operation of the ASURO xTend. The data will be kept over several weeks.