EM3028-C7- Real Time Clocks - Modules

Real Time Clock Module with I2C-Bus, Ultra Low Power - Ultra-Low Power

General Description

The EM3028-C7 engineered using the in-house analog low power (ALP) technology provides unmatched true ultra-low current consumption of typically 40nA while running on a standard 32’768 Hz tuning fork crystal. Thus allowing several hours of backup supply using cost effective MLCC capacitors.  

It provides full RTC function with programmable counters, alarm, selectable interrupt and clock output functions and also a 32-bit UNIX Time counter.  

The internal EEPROM memory hosts all configuration settings and allows for additional 43 bytes of user memory.  

All addresses and data are transferred over an I2C-bus interface for communication with a host controller.  

This ultra-small RTC module has been specially designed for miniature and cost sensitive high volume applications. 



The EM3028-C7 RTC module combines key functions with outstanding performance in an ultra-small ceramic package, special designed for: 

  • IoT
  • Wearable systems
  • Multi-Solar cell platforms
  • Beacons and wireless sensor networks
  • Industrial and environmental monitoring
  • Battery operated platforms


  • Extreme low power consumption: 40 nA @ 3 V.
  • Wide operating voltage range: 1.2 V to 5.5 V.
  • Built-in tuning Fork crystal at 32’768 Hz
  • Time accuracy: Factory calibrated to ±1 ppm @ 25°C
  • Non-volatile configuration settings with user programmable offset value.
  • Configuration stored in EEPROM and mirrored in RAM
  • Backup Switch and Trickle Charger function.
  • Provides year, month, date, weekday, hours, minutes and seconds.
  • Automatic leap year correction; 2000 to 2099.
  • 32 bit UNIX time counter.
  • Timer, alarm and external event functions with time stamp.
  • Clock output: 32.768 kHz, 8192 Hz, 1024 Hz, 64 Hz, 32 Hz, 1 Hz.
  • 43 bytes non-volatile user memory, 2 bytes user RAM.
  • I2C-bus interface: 400 kHz.
  • Packages (RoHS compliant and Lead-free)
    - Ultra small SMD C7 package, 3.2 x 1.5 x 0.8mm Part number EM3028C7
    - TSSOP14 (with external crystal), Part number EM3028VxTP14 (x = Version nbr)
EM3028-C7 Data Sheet (2.89 MB)2.89 MB
EM3028-C7 Fact Sheet (791.47 KB)791.47 KB
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