STCC02-E datasheet(5/13 Pages) STMICROELECTRONICS

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STCC02-ED5

5/13

■ 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

Demagnetizing Diode

Relay

Transistor

15 k

Ω

VCC

VDD

BUZ3

FAN1

IN3

IN1

Relay

Transistor

Buzzer

Transistor

Demagnetizing Diode

50 k

Ω

15 k

Ω

1.5 k

Ω

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