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ST62E25BD6 Datasheet(PDF) 23 Page - STMicroelectronics |
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ST62E25BD6 Datasheet(HTML) 23 Page - STMicroelectronics |
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23 / 105 page  ST6215C ST6225C 23/105 5.2 LOW VOLTAGE DETECTOR (LVD) The on-chip Low Voltage Detector is enabled by setting a bit in the option bytes (refer to the Option Bytes section of this document). The LVD allows the device to be used without any external RESET circuitry. In this case, the RESET pin should be left unconnected. If the LVD is not used, an external circuit is manda- tory to ensure correct Power On Reset operation, see figure in the Reset section. For more details, please refer to the application note AN669. The LVD generates a static Reset when the supply voltage is below a reference value. This means that it secures the power-up as well as the power- down keeping the ST6 in reset. The V IT- reference value for a voltage drop is lower than the V IT+ reference value for power-on in order to avoid a parasitic reset when the MCU starts run- ning and sinks current on the supply (hysteresis). The LVD Reset circuitry generates a reset when VDD is below: – V IT+ when V DD is rising – V IT- when V DD is falling The LVD function is illustrated in Figure 12. If the LVD is enabled, the MCU can be in only one of two states: – Over the input threshold voltage, it is running un- der full software control – Below the input threshold voltage, it is in static safe reset In these conditions, secure operation is guaran- teed without the need for external reset hardware. During a Low Voltage Detector Reset, the RESET pin is held low, thus permitting the MCU to reset other devices. Figure 12. Low Voltage Detector Reset VDD VIT+ RESET VIT- Vhyst 1 |
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