SN8A1702AX datasheet(57/145 Pages) SONIX

57 / 145 page

SN8P1700

8-bit micro-controller build-in 12-bit ADC

SONiX TECHNOLOGY CO., LTD

Page 57

Revision 1.94

In worse-power condition as brown out reset. The reset pin may keep high level but the VDD is low voltage. That

makes the system reset fail and chip error. To connect a diode from reset pin to VDD is a good solution. The circuit

can force the capacitor to release electric charge and drop the voltage, and solve the error.

GND

VCC

RST

VDD

MCU

VSS

20K ohm

0.1uF

DIODE

Figure 6-4. External Reset Circuit with Diode

LOW VOLTAGE DETECTOR (LVD) DESCRIPTION

The LVD is a low voltage detector. It detects VDD level and reset the system as the VDD lower than the desired

voltage. The detect level is 2.4V. If the VDD lower than 2.4V, the system resets. The LVD function is controlled by code

option. Users can turn on it for special application like worse power condition. LVD work with external reset function.

They are OR active.

System Reset

LVD Detect Level

End of LVD Reset

VDD

LVD

Figure 6-5. LVD Timing Diagram

The LVD can protect system to work well under brownout reset. But it is a high consumptive circuit. In 3V condition, the

LVD consumes about 100uA. It is a very large consumption for battery system. So the LVD supports AC system well.

Notice: LVD is selected by code option.

SN8A1702AX Datasheet(PDF) 57 Page - SONiX Technology Company