EM3028- Real Time Clocks - IC

Extreme low power RTC, 48nA standby current, 43 Bytes of User EEPROM and Battery Backup with Trickle Charger

General Description

The EM3028 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.

It is available in a TSSOP14 plastic package or as a module combining the 32 kHz Crystal with the RTC IC in an ultra-small, hermetically sealed C7 SMD package, factory calibrated to an initial accuracy of +/- 1ppm.


  • 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: possible to calibrate 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)
    - TSSOP14, Part number EM3028VxTP14 (x = Version nbr)
    - Ultra small SMD C7 package, 3.2 x 1.5 x 0.8mm Part number EM3028C7 (with integrated crystal)
EM3028 Fact Sheet (821.85 KB)821.85 KB
EM3028 Data Sheet (3.59 MB)3.59 MB
SW Drivers (7.03 MB)7.03 MB
Development Board Schemalibrary (1.12 MB)1.12 MB
Executable (4.81 MB)4.81 MB
Development Board (909.4 KB)909.4 KB
GUI (Graphical user interface) (702.75 KB)702.75 KB
EM 3028 Innovation Proposal (614.83 KB)614.83 KB
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