SN32F100 Series
32-Bit Cortex-M0 Micro-Controller
SONiX TECHNOLOGY CO., LTD
Page 42
Version 1.9
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
RST
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
RST
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
.
The operating voltage is not accurate as Zener diode reset circuit. Use R1, R2 bias voltage to be the active level. When
VDD voltage level is above or equal to “0.7V x (R1 + R2) / R1”, the C terminal of the PNP transistor outputs high
voltage and MCU operates normally. When VDD is below “0.7V x (R1 + R2) / R1”, the C terminal of the PNP transistor
Содержание SN32F107
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