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AN2017 Datasheet(PDF) 9 Page - STMicroelectronics |
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AN2017 Datasheet(HTML) 9 Page - STMicroelectronics |
9 / 10 page 9/10 DIFFERENT WAYS TO RESET ST7 MICROCONTROLLER 5 PROS AND CONS OF DIFFERENT TYPES OF RESET MECHANISM This section includes the advantages and disadvantages of both External Reset and Internal LVD. In the section below ‘+’ indicates advantages and ‘-’ indicates disadvantages. 5.1 EXTERNAL RESET CIRCUIT + It can be used for very slow rising supply. External RCD circuit is suitable for fairly fast VDD slopes. Transistor based Reset circuits can be used for very slow VDD slopes - Extra components required resulting in additional cost and extra space on PCB - Current consumption (Transistor based External Reset circuits) higher than that of Internal LVD 5.2 INTERNAL LVD + Each MCU has three programmable thresholds + No additional cost, as this feature come with the microcontroller + No extra components, no extra space on the PCB - LVD current consumption quite high when compared to External LVD - VDD slope range is limited - Supply Voltage should rise monotonously for correct functionality of LVD - Poor accuracy of reset voltage threshold 5.3 EXTERNAL LVD + Could be useful if the application requires a specific threshold (other than LVD threshold) + Power consumption much less (6uA for STM809-812) + Offers excellent immunity to supply transients + A stand alone Reset can monitor a special voltage for a peripheral + Several stand alone resets can be put in parallel. + Reset threshold more accurate - One chip can provide only one threshold (Internal LVD has three programmable thresholds) - Extra space on PCB - Additional cost, cost: 1 to 10K units: $0.16 |
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