Samsung RB195BSSB Service Manual - Page 48

Reset Circuit, 4 Eeprom Detection Circuit, 5 Door Switch Detecton Circuit

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OPERATION PRINCIPLES BY PARTS OF CIRCUIT 12-3) RESET CIRCUIT Terminal Vcc Reset Power DC 5V DC 5V 1) RESET Circuit allows the whole program to go back to the initial setting by initializing parts such as the RAM in MICOM with the power supply into MICOM or with an instant power failure. Upon the power supply,the reset terminal voltage becomes "LOW" for several tens of ㎲ compared to Vcc voltage(DC 5V)at MICOM,and it maintains "HIGH"(Vcc Voltage)during normal operation. But, when Vcc drops down to 3.4~3.7V, the reset terminal voltage becomes "LOW". 12-4) EEPROM DETECTION CIRCUIT 1) A semiconductor memory EEPROM stores data remembering previous settings regardless of power-off,which are indispensable especially in power fluctuating areas.Also,EEPROM sets and uses other options in principle. 12-5) DOOR SWITCH DETECTON CIRCUIT 48

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48
OPERATION PRINCIPLES BY PARTS OF CIRCUIT
1) RESET Circuit allows the whole program to go back to the initial setting by initializing parts such as
the RAM in MICOM with the power supply into MICOM or with an instant power failure.
Upon the power supply,the reset terminal voltage becomes "LOW" for several tens of
㎲
compared to
Vcc voltage(DC 5V)at MICOM,and it maintains "HIGH"(Vcc Voltage)during normal operation.
But, when Vcc drops down to 3.4~3.7V, the reset terminal voltage becomes "LOW".
1)
A semiconductor memory EEPROM stores data remembering previous settings regardless of
power-off,which are indispensable especially in power fluctuating areas.Also,EEPROM sets and
uses other options in principle.
Terminal
Vcc
Reset
Power
DC 5V
DC 5V
12-3) RESET CIRCUIT
12-4) EEPROM DETECTION CIRCUIT
12-5) DOOR SWITCH DETECTON CIRCUIT