Low-power real-time-clock has integrated battery power

February 28, 2014 // By Graham Prophet
Cymbet’s EnerChip RTC combines a 35 nA RTC with solid state battery and PMIC in a tiny package.

EnerChip RTC is product family that combines an ultra-low power real time clock with a rechargeable solid state battery and power management IC in a single 5 x 5mm plastic package; the smallest-available RTC with integrated power holdover. This is accomplished by using bare die RTC, EnerChip battery and PMIC devices combined into a single package that uses Surface Mount Technology (SMT) and reflow solder processes. EnerChip RTCs provide from 30 to over 100 hours of RTC power back-up per charge with thousands of recharge cycles. The EnerChip RTC is a replacement for bulky and troublesome coin cell batteries and supercapacitors.

The first three devices in the EnerChip RTC product family are:

  • CBC34123 that combines an NXP RTC with the EnerChip and PMIC for 30 hours power holdover and supports SPI-bus.
  • CBC34803 that that combines an Ambiq RTC with the EnerChip and PMIC for 100 hours power holdover and supports I 2C-bus
  • CBC34813 that that combines an Ambiq RTC with the EnerChip and PMIC for 100 hours power holdover and supports SPI-bus

The various EnerChip RTC configurations support: Alarm and timer functions, General Purpose Outputs, XT Oscillator, 256B RAM, Calibration/Auto-calibration, RC Oscillator, Watchdog, External Interrupts, a VBAT switch, and on-chip battery charge control with power management.

Each EnerChip RTC device has a CBC-EVAL-12 evaluation kit that has a USB interface with the EnerChip RTC on a small removable tab board and a PC-based Graphical User Interface that provides full register read/write access on the EnerChip RTC.

Cymbet; www.cymbet.com/products/enerchip-real-time-clocks.php