SN8P1829
8-Bit MCU build-in 12-bit ADC + PGIA + Charge-pump Reg 128 dots LCD driver
SONiX TECHNOLOGY CO., LTD
Page 41
Version 1.0
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.
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 1.8V. If the VDD lower than 1.8V, 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
Note: LVD is always Enable in SN8P1829
MCU
VDD
VSS
VCC
GND
RST
R
20K
ohm
C
0.1uF
DIODE
100-ohm