Conclusion

AN1353

10/17

Rev 2

6

Conclusion

This paper has presented how a software for ST6200C MCUs has been developed for

thermostat applica-tions. The main goals of this software are:

●

Low cost: no external resonator is used even if good accuracy for time control is

required. This is achieved thanks to a mains period based calculation method. No

external RESET circuit is needed thanks the MCU LVD option.

●

Low consumption: all ACS and ACST devices are triggered by pulsed gate currents in

order to reduce the average current consumption.

●

Noise immunity: the noise immunity has been increased by several software

techniques (smart reset, ADC results averaging). The hardware watch-dog option must

also be activated and unused program memory space can be filled as described in the

AN435 Application Note.

This paper will help users to adapt the software to their own requirements. The following

data in particular must be checked:

●

Peak current measure moment (T5 register)

●

Gate current pulses delay & duration

●

Maximum peak current value to detect an over current (VLIMIT constant)

●

Temperature control Hysteresis threshold.