SN32F260 Series
32-Bit Cortex-M0 Micro-Controller
SONiX TECHNOLOGY CO., LTD Page 37 Version 1.5
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).
3.1.4.3 ZENER DIODE RESET CIRCUIT
MCU
VDD
VSS
VCC
GND
R
S
T
R1
33K ohm
R3
40K ohm
R2
10K ohm
Vz
Q1
E
C
B
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.
3.1.4.4 VOLTAGE BIAS RESET CIRCUIT
MCU
VDD
VSS
VCC
GND
R
S
T
R1
47K ohm
R3
2K ohm
R2
10K ohm
Q1
E
C
B
The voltage bias reset circuit is a low cost voltage detector and can improve brown out reset condition completely.
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