SN8P2604
8-Bit Micro-Controller
SONiX TECHNOLOGY CO., LTD
Page 43
Version 1.1
3.5 LOW VOLTAGE DETECTOR (LVD)
Low voltage detector (LVD) is built in system and the detect level is
1.8V
. If VDD dips below LVD detect level, system
is reset. If VDD returns to above LVD detect level, system executes power on routine and program starts to work.
Under high noisy situation, VDD is unstable and might dip to low voltage but not zero. This condition is called Brown
Out. In brown out situation, the external reset would be error, and system can’t reset by external reset and halts.
System should be reset in brown out event. LVD operation provides a not zero voltage to do brown out detecting. If
brown out occurs, LVD reset the system and protect system to keep in working status. LVD reset sequence is like
power on reset sequence.
VDD
VSS
System Normal Run
System Stop
LVD Detect Voltage
Power On
Delay Time
Power
System Status
Power Drops to < LVD Detect
Voltage and System Reset.
Brown Out Reset Diagram