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STM1816 Datasheet(PDF) 9 Page - STMicroelectronics |
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STM1816 Datasheet(HTML) 9 Page - STMicroelectronics |
9 / 25 page STM1810/1811/1812/1813/1815/1816/1817/1818 Operation Doc ID11464 Rev 8 9/25 2 Operation 2.1 Reset output The STM181x asserts a reset signal to the microcontroller (MCU) whenever VCC goes below the reset threshold (VRST), and is guaranteed valid down to VCC = 1.0 V (0 °C to 105 °C). A microcontroller’s (MCU) reset input starts the MCU in a known state. The STM1810 - STM1813/ STM1815 - STM1818 low power reset circuits assert reset to prevent code-execution errors during power-up, power-down, and brownout conditions (Figure 7). During power-up, once VCC exceeds the reset threshold an internal timer keeps RST low for the reset time-out period, trec. After this interval, RST returns high. If VCC drops below the reset threshold, RST goes low. Each time RST is asserted, it stays low for at least the reset time-out period. Any time VCC goes below the reset threshold, the internal timer clears. The reset timer starts when VCC returns above the reset threshold. Reset trec is also triggered by an externally initiated rising edge on the RST pin (STM1813/STM1818), following a low signal of 1.5 µs minimum duration. 2.2 Push-button detect reset (STM1813/1818) Many systems require push-button reset capability (Figure 8), allowing the user or external logic circuitry to initiate reset. On the STM1813/STM1818, a logic low on RST held for greater than 1.5 µs asserts a reset. RST deasserts following a 100 ms minimum reset time- out delay (trec). A manual reset input shorter than 1.5 µs may release RST without the 100 ms minimum reset time-out delay. To facilitate use with mechanical switches, the STM1813/STM1818 contain internal debounce circuitry. A debounced waveform is shown in Figure 9 The RST output has an internal 5.5 k Ω pull-up resistor. 2.3 Interfacing to bidirectional microcontrollers (MCU’s) As the RST output on the STM1811/STM1816 is open-drain, these devices interface easily with MCU’s that have bidirectional reset pins. Connecting the µP supervisor’s reset (RST) output directly to the microcontroller’s reset (RST) pin allows either device to assert reset (Figure 10). No external pull-up resistor is required, as it is within the STM1811/STM1816. 2.4 Negative going VCC transients The STM181x are relatively immune to negative-going VCC transients (glitches). Figure 19 shows typical transient duration versus reset comparator overdrive (for which the STM181x will NOT generate a reset pulse). The graph was generated using a negative pulse applied to VCC, starting at 0.5 V above the actual reset threshold and ending below it by the magnitude indicated (comparator overdrive). The graph indicates the maximum pulse width a negative VCC transient can have without causing a reset pulse. As the magnitude of the transient increases (further below the threshold), the maximum allowable pulse width decreases. Any combination of duration and overdrive which lies under the curve will NOT generate a reset signal. Typically, a VCC transient that goes 100 mV below the reset threshold and lasts 20 µs or less will not cause a reset pulse. A 0.1 µF bypass capacitor mounted as close as possible to the VCC pin provides additional transient immunity. |
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