Hardware configuration

AN1353

2/17

Rev 2

Figure 1.

Bread-board schematic

Note the following features on the MCU hardware environment:

●

The clock is achieved by the internal oscillator

●

No external reset circuit is used, thanks to the Low Voltage Detector option of the MCU

●

The Zero Voltage Crossing (ZVC) event is sensed through R6 by the NMI pin.

2.2

I/O port configuration

The following table explains what the I/O ports are used for, and how they are configured,

beginning with the Port B which is configured in Input (except for PB1 which is configured as

a push pull output).

All the inputs are configured with a pull up resistor, except for when they are used as an

ADC input. No In-terrupt is active on any of these pins.

All port A pins are configured as push pull outputs. Table 2 details the option choices and

configuration reg-isters.

S2

doorswitch

R14

51R

R4

360R

R1

33R 1/2W

R8

62K

Run

J1

BULB

1

2

Start

L_PCB

6µH

C7

2.2nF

C6

1nF

C1

470nF X2

VDD

C4

10 nF X2

U1

ST62T00C

2

3

16

14

15

13

12

11

10

9

8

7

4

6

5

1

OSCIN

OSCOUT

VSS

PA2

PA1

PA3

PB0/AIN

PB1/AIN

PB3/AIN

PB5/AIN

PB6/AIN

PB7/AIN

NMI

RST

VPP/TEST

VDD

R10

50m 1/2 W

J2

NTC

1

2

6V2 1.3W

D2

F1

FUSE 6 A / 250 V

R11

47R 1/2 W

R3

160R

R5

1.5K

R6

470K

D1

LED

C9

2.2nF

R12

1K

+

2200µF / 10 V

C3

R7

33k

R9

47K

Tb

Bulb ACS102

Ts

Run ACST6

Tr

Start ACST6

J3

DOOR

1

2

VDD

D3

R2

160R

N

J4

MOTOR

1

2

3

100K

POT A

C8

2.2nF

L

C12

1 µF

C11

680pF

L

C2

100nF

C5

1nF

C10

2.2nF

VDD

J5

MAINS

1

2

3

R13

51R

Table 1.

Port B configuration registers

Pin Name

USE

DDR

OR

DR

PB0

Not used

0

0

0

PB1

Switch ON the LED / Switch OFF the LED

1

1

0/1

PB2

Not existing for ST6200

0

0

0

PB3

SHUNT voltage Analog Input / Input with pull up

0

1/0

1/0

PB4

Not existing for ST6200

0

0

0

PB5

Temperature order Analog Input / Input with pull up

0

1/0

1/0

PB6

Door switch information

0

0

0

PB7

Cabinet temperature Analog Input / Input with pull up

0/0

1/0

1/0