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ST92141 데이터시트(PDF) 78 Page - STMicroelectronics

부품명 ST92141
상세설명  8/16-BIT MCU FOR 3-PHASE AC MOTOR CONTROL
PDF  179 Pages
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제조업체  STMICROELECTRONICS [STMicroelectronics]
홈페이지  http://www.st.com
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ST92141 데이터시트(HTML) 78 Page - STMicroelectronics

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ST92141 - RESET AND CLOCK CONTROL UNIT (RCCU)
5.8 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 VLVDf reference
value. This means that it secures the power-up as
well as the power-down keeping the ST9 in reset.
The VLVDf reference value for a voltage drop is
lower than the VLVDr reference value for power-on
in order to avoid a parasitic reset when the MCU
starts running and sinks current on the supply
(hysteresis).
The LVD Reset circuitry generates a reset when
VDD is below:
–VLVDr when VDD is rising
–VLVDf when VDD is falling
The LVD function is illustrated in Figure 40.
Provided the minimum VDD value (guaranteed for
the oscillator frequency) is below VLVDf, 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.
Figure 40. Low Voltage Detector vs Reset
VDD
VLVDr
RESET
VLVDf
HYSTERISIS
VLVDhyst
1



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