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STCC-02
CONTROL CIRCUIT FOR HOME APPLIANCE MCU BASED APPLICATION
1/13
STCC02-BD5CONTROL CIRCUIT FOR HOME APPLIANCE
MCU BASED APPLICATION
October 2004 REV. 3
APPLICATIONS Microwaves oven analog and power driver control Home Appliance digital control
FEATURES Wide range input supply voltage operation:
7 to 27 V 5 V ± 10% full tolerance Voltage Regulator MCU reset circuit with activation delay timer
and 45µs digital noise filter Highly immune and 30 µs filtered Zero Voltage
Synchronization Door Closed detection adaptation One 100 mA fan relay coil driver with
demagnetizing diode One 100 mA magnetron relay coil driver with
demagnetizing diode including down lock cir-
cuit based on fan drive output state One 10 mA buzzer driver Ambient temperature: - 10 to 85 °C
Table 1. Order Code
BENEFITS Higher module compactness with reduced component count Drastic reduction of soldered pins on the board for faster module assembly time and lower use of lead High ESD robustness and transient burst immunity compliant with IEC61000-4 standards Enhanced functional reliability Accurate MCU supply for better Analog to Digital Conversion Enhanced circuit parametric quality Easy to design for short time to market
Figure 1: STCC02 Based Application Diagram
STCC02-BD5
FUNCTIONAL DESCRIPTIONThe STCC02 is a control circuit embedding most of the analog & power circuitry of a microwaves oven con-
trol module. It interfaces the micro-controller with the power and process sections of the oven.
The voltage supplyThe 5V voltage regulator supplies the micro-controller MCU: especially functions such as the timer, the
Analog-Digital Converter ADC, and the low current outputs. Since all the high-current outputs sink their
current from a different voltage supply, this regulator does not need to be oversized. Its average output
current can vary from 5 to 20 mA.
Its output voltage accuracy, that contributes to the ADC accuracy of the MCU, is better than ± 10 % in the
whole operating range of the temperature TAMB, the load current IDD and the input voltage VIN . The
STCC02 input voltage range from 7 to 27 V; and its DC output current is less than 20 mA to keep the inter-
nal dissipation compatible with thermal package capability.
The regulator includes also an over current limiter to prevent high current conditions during the power up
inrush or the output short circuit. This limiter is made of a serial shunt resistance as current sensor and a
circuit that regulates the input over current.
The reset circuitThis circuit ensures a Low Voltage Detection (LVD) of the output voltage of the regulator. Most micro-
controllers have an active RESET pin in the low state: so, the /RST pin will be active at low state.
Figure 2: Pin-out connections Figure 3: Block diagram
STCC02-BD53/13
STCC02-BD5
STCC02-BD55/13
STCC02-BD5
Table 2: Absolute Ratings (limiting values)
Note 1: Refer to the Application Recommendations for the calcultation of the functional dissipation.
Table 3: Electromagnetic Compatibility Ratings(TJ = 25°C, according to typical application diagram of page 1, unless otherwise specified)
Table 4: Thermal Resistance
STCC02-BD57/13
Table 5: Tentative Electrical Characteristics (TJ = 25°C, VCC = 12V, unless otherwise specified)
