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STM1815LTWX7F bảng dữ liệu(PDF) 9 Page - STMicroelectronics

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STM1810/1811/1812/1813/1815/1816/1817/1818
Operation
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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 8).
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 9), 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 10 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 11). 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 20
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


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