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ST72511R bảng dữ liệu(PDF) 24 Page - STMicroelectronics |
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ST72511R bảng dữ liệu(HTML) 24 Page - STMicroelectronics |
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24 / 164 page  ST72311R, ST72511R, ST72512R, ST72532R 24/164 5.1 LOW VOLTAGE DETECTOR (LVD) To allow the integration of power management features in the application, the Low Voltage Detec- tor function (LVD) generates a static reset when the VDD supply voltage is below a VIT- reference value. This means that it secures the power-up as well as the power-down keeping the ST7 in reset. The VIT- reference value for a voltage drop is lower than the VIT+ 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: –VIT+ when VDD is rising –VIT- when VDD is falling The LVD function is illustrated in Figure 10. Provided the minimum VDD value (guaranteed for the oscillator frequency) is below VIT-, the MCU can only be in two modes: – under full software control – in static safe reset In these conditions, secure operation is always en- sured for the application without the need for ex- ternal reset hardware. During a Low Voltage Detector Reset, the RESET pin is held low, thus permitting the MCU to reset other devices. Notes: The LVD allows the device to be used without any external RESET circuitry. The LVD is an optional function which can be se- lected when ordering the device (ordering informa- tion). Figure 10. Low Voltage Detector vs Reset VDD VIT+ RESET VIT- Vhys |
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