STCC02-ED5 Datasheet, PDF (2/13 Pages) STMicroelectronics – CONTROL CIRCUIT FOR HOME APPLIANCE MCU BASED APPLICATION

STCC02-ED5
Figure 2: STCC02 Based Application Diagram
Line
MAINS
VCC
VIN
Neutral
JP
DOOR SWITCH
VCC
VCC
CUP
RZV
MAGNETRON RELAY
VIN
DLC
SYN
DS
MAG2
FAN RELAY
FAN1
VCC
COM
5V Regulator
Reset with delay
Zero volts sync.
Door closed detection
Magnetron driver
Fan driver
Buzzer driver
VDD
/RST
ZVS
CDD
IN2
IN1
IN3
BUZ3
CDD VSS
/RST
NMI
P04
P01
P02
P03
MCU
CDD
BUZZER
Figure 3: Circuit Block Diagram
VIN
DLC
SYN
DS
MAG2
FAN1
VCC
COM
5V Regulator
Reset with delay
Zero volts sync.
Door closed detection
Magnetron driver
Fan driver
Buzzer driver
VDD
/RST
ZVS
CDD
IN2
IN1
IN3
BUZ3
FUNCTIONAL DESCRIPTION
The STCC02 is a control circuit embedding most of
the analog & power circuitry of a microwaves oven
control module. It interfaces the micro-controller with
the power and process sections of the oven.
■ The voltage supply
The 5V voltage regulator supplies the micro-control-
ler 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 regula-
tor does not need to be oversized. Its average out-
put current can vary from 5 to 20 mA.
2/13
RSENSE
VIN
Over current
limiter
1.25V
Reference
-
+
R1
R2
VDD