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STCC02-ED5 Datasheet(PDF) 5 Page - STMicroelectronics

Part No. STCC02-ED5
Description  CONTROL CIRCUIT FOR HOME APPLIANCE MCU BASED APPLICATION
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Maker  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
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STCC02-ED5 Datasheet(HTML) 5 Page - STMicroelectronics

 
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The magnetron relay coil driver
This robust driver interfaces a DC relay coil and an MCU output. The relay coil power is rated up to 1.2 W
for VCC = 12V.
Its output stage is made of a transistor and a demagnetization diode. The transistor's reference is to the
power ground COM and has a DC current rating of 100 mA. Its collector is connected to the outputs MAG2.
The diode is connected between the output pin MAG2 and the Door Switch pin DS.
To enhance safety rules and to prevent any unventilated operation of the magnetron, the relay coil mag-
netization is enabled by the fan conduction state that becomes a logic signal FAN1\.
Furthermore, its demagnetization node is connected to the door switch pin DS: when the oven door is
open, the coil of the magnetron relay is immediately disconnected from the relay supply VCC to switch off
these heating loads.
The boolean rule of the magnetron relay operation becomes:
(Magnetron relay ON) = DS.IN2.FAN1\.
Fan relay coil driver
This robust driver interfaces a DC relay coil and an MCU output. The relay coil power is rated up to 1.2W
for VCC =12 V.
Its output stage is made of a transistor and a demagnetization diode. The transistor is referred to the
ground COM, has a DC current rating of 100 mA; and its collector is connected to the output FAN1. The
diode is connected between the output pin FAN1 and the supply pin VCC.
VDD
MAG2
IN2
FAN1
DS
Demagnetizing Diode
Relay
Transistor
15 k
VCC
VCC
VDD
VDD
BUZ3
FAN1
IN3
IN1
Relay
Transistor
Buzzer
Transistor
Demagnetizing Diode
50 k
15 k
1.5 k


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