Senstech Sdn. Bhd. MD-H01 Manual De Usuario
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7.3
Microprocessor
Fig3 composition of the LED drive, USB interface, serial data interface, and power reset circuit that centers on
the U8 C8051F321 microprocessor. The crystal oscillator is unnecessary, because the clock generator is built
into U8 internally. Moreover, 3.3V voltage regulator and USB driver are built into it. 3.3V constant voltage
is output from 6Pin. This Vdd is used so as not to change brightness of LED by the Vcc change. R26, R27,
C19, and C20 are for reset time constant. CN3 is USB interface connector, and C4 is a connector for the
serial interface. CN4-1Pin must use 5V when you use the serial interface connector.
the U8 C8051F321 microprocessor. The crystal oscillator is unnecessary, because the clock generator is built
into U8 internally. Moreover, 3.3V voltage regulator and USB driver are built into it. 3.3V constant voltage
is output from 6Pin. This Vdd is used so as not to change brightness of LED by the Vcc change. R26, R27,
C19, and C20 are for reset time constant. CN3 is USB interface connector, and C4 is a connector for the
serial interface. CN4-1Pin must use 5V when you use the serial interface connector.