SN8P2613 datasheet(39/102 Pages) SONIX

39 / 102 page

SN8P2610 Series

8-Bit Micro-Controller

SONiX TECHNOLOGY CO., LTD

Page 39

Version 1.3

3.4 BROWN OUT RESET

3.4.1 BROWN OUT DESCRIPTION

The brown out reset is a power dropping condition. The power drops from normal voltage to low voltage by external

factors (e.g. EFT interference or external loading changed). The brown out reset would make the system not work well

or executing program error.

VDD

VSS

System Work

Well Area

System Work

Error Area

Brown Out Reset Diagram

The power dropping might through the voltage range that’s the system dead-band. The dead-band means the power

range can’t offer the system minimum operation power requirement. The above diagram is a typical brown out reset

diagram. There is a serious noise under the VDD, and VDD voltage drops very deep. There is a dotted line to separate

the system working area. The above area is the system work well area. The below area is the system work error area

called dead-band. V1 doesn’t touch the below area and not effect the system operation. But the V2 and V3 is under the

below area and may induce the system error occurrence. Let system under dead-band includes some conditions.

DC application:

The power source of DC application is usually using battery. When low battery condition and MCU drive any loading,

the power drops and keeps in dead-band. Under the situation, the power won’t drop deeper and not touch the system

reset voltage. That makes the system under dead-band.

AC application:

In AC power application, the DC power is regulated from AC power source. This kind of power usually couples with AC

noise that makes the DC power dirty. Or the external loading is very heavy, e.g. driving motor. The loading operating

induces noise and overlaps with the DC power. VDD drops by the noise, and the system works under unstable power

situation.

The power on duration and power down duration are longer in AC application. The system power on sequence protects

the power on successful, but the power down situation is like DC low battery condition. When turn off the AC power,

the VDD drops slowly and through the dead-band for a while.

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