AN1353 Datasheet, PDF (10/17 Pages) STMicroelectronics – ASD ST62000C software description for cooling thermostat applicatons

Conclusion
6
Conclusion
AN1353
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.
10/17
Rev 2