AN-1059: Extend Battery Life by Reducing System Power using the EnerChip RTC

©2014 Cymbet Corporation • Tel: +1-763-633-1780 • www.cymbet.com

Doc AN-72-1059 Rev A

Page 5 of 5

Important CBC348xx Registers to Consider

Control1 Register: PWR2 -> When 1, the PSW/nIRQ register is driven by an approximately 1Ω pull-down. Set this

to control power to the system.

Control1 Register: OUTB -> Set to inactive level (1) of PSW/nIRQ2 pin.

Control2 Register: OUT2S -> Set this field to 0x100 to send timer interrupt to PSW/nIRQ2 pin.

Countdown Timer Control Register -> Configures timer operation. TE turns timer on/off. TM, TRPT = 1.

Countdown Timer Register -> Set to decimal 32 to divide the 128Hz RC clock down to 4Hz.

Timer Initial Value Register -> Set to decimal 32 as above for auto-reload of 4Hz period.

Oscillator Control Register: OSEL-> Set to 1 to use 128Hz RC oscillator for timers.

Oscillator Status Register: LK02 -> Set to 0 to unlock OSEL.

Pseudo-Code Examples

Please contact the Cymbet Applications group for code examples.

Disclaimer of Warranties; As Is

The information provided in this data sheet is provided “As Is” and Cymbet Corporation disclaims all representations or warranties of any

kind, express or implied, relating to this data sheet and the Cymbet EnerChip product described herein, including without limitation, the

implied warranties of merchantability, fitness for a particular purpose, non-infringement, title, or any warranties arising out of course of

dealing, course of performance, or usage of trade. Cymbet EnerChip products are not authorized for use in life critical applications. Users

shall confirm suitability of the Cymbet EnerChip product in any products or applications in which the Cymbet EnerChip product is adopted

for use and are solely responsible for all legal, regulatory, and safety-related requirements concerning their products and applications and

any use of the Cymbet EnerChip product described herein in any such product or applications.

U.S. Patent No. 8,144,508. Additional U.S. and Foreign Patents Pending.

Cymbet, the Cymbet Logo, and EnerChip are Cymbet Corporation Trademarks

Ordering Information

EnerChip RTC Part Number

Description

Notes

CBC34803-M5C

EnerChip RTC in 5mm x 5mm x

1.4mm 16-QFN Land Grid Array

Shipped in Tube

CBC34803-M5C-TR1

CBC34803-M5C-TR5

EnerChip RTC in 5mm x 5mm x

1.4mm 16-QFN Land Grid Array

Tape-and-Reel - 1000 pcs (TR1) or

5000 pcs (TR5) per reel

CBC34813-M5C

EnerChip RTC in 5mm x 5mm x

1.4mm 16-QFN Land Grid Array

Shipped in Tube

CBC34813-M5C-TR1

CBC34813-M5C-TR5

EnerChip RTC in 5mm x 5mm x

1.4mm 16-QFN Land Grid Array

Tape-and-Reel - 1000 pcs (TR1) or

5000 pcs (TR5) per reel

CBC-EVAL-12-34803

EnerChip RTC Evaluation Kit

USB based Eval Kit with

CBC34803 tab board

CBC-EVAL-12-34813

EnerChip RTC Evaluation Kit

USB based Eval Kit with

CBC34813 tab board