Analysis of electronic counter with power-off memory function circuit

QIAN Ning

（Autonics Electronic（Jiaxing）Corporation，Jiaxing 314033，China）

Abstract：Aiming at the problem that the electronic counter instruments in a sudden power failure or undervoltage，how can be stored count data before the power off，and the power is restored from the data state before the power off began to continue the work，in recent decades and in the field of industrial control，a variety of methods of the power- off memory function and their advantages and disadvantages were listed. Focuses on the implementation method of CT series electronic counter power-off memory function，through the integrated circuit chip operating voltage of CT series electronic counter respectively circuit power-off memory part of the 5 V and the 3.3 V two kind of situations were compared，and was set up in the two different working voltage，change of voltage after switch off with different，and caused power-off memory signal has the difference. Then，it was evaluated from the power consumption on the use of the two different working voltage integrated circuit performance. The results indicate that power-off memory device of CT series electronic counter is simple and practical，use the working voltage of integrated circuit chip 3.3 V can obtain the power-off memory effect is more stable.

Key words：electronic counter；power- off memory function；zener diode；electrically- erasable programmable read- only memory；change of voltage after switch off