SN8P2614 Datasheet, PDF (44/99 Pages) SONiX Technology Company – 8-Bit Micro-Controller

3.6.2 Diode & RC Reset Circuit
VDD
DIODE
C1
0.1uF
R1
47K ohm
R2 _RST
100 ohm
MCU
VSS
SN8P2614 Series
8-Bit Micro-Controller
VCC
GND
This is the better reset circuit. The R1 and C1 circuit operation is like the simply reset circuit to make a power on signal.
The reset circuit has a simply protection against unusual power. The diode offers a power positive path to conduct
higher power to VDD. It is can make reset pin voltage level to synchronize with VDD voltage. The structure can
improve slight brown out reset condition.
’ Note: The R2 100 ohm resistor of “Simply reset circuit” and “Diode & RC reset circuit” is necessary to
limit any current flowing into reset pin from external capacitor C in the event of reset pin
breakdown due to Electrostatic Discharge (ESD) or Electrical Over-stress (EOS).
3.6.3 Zener Diode Reset Circuit
R1
33K ohm
Vz
VDD
R2 _B
10K ohm
E
Q1
C RST
R3
40K ohm
VSS
MCU
VCC
GND
The zener diode reset circuit is a simple low voltage detector and can improve brown out reset condition
completely. Use zener voltage to be the active level. When VDD voltage level is above “Vz + 0.7V”, the C terminal of
the PNP transistor outputs high voltage and MCU operates normally. When VDD is below “Vz + 0.7V”, the C terminal of
the PNP transistor outputs low voltage and MCU is in reset mode. Decide the reset detect voltage by zener
specification. Select the right zener voltage to conform the application.
SONiX TECHNOLOGY CO., LTD
Page 44
Preliminary Version 0.3