參數(shù)資料
型號(hào)： ST72141K2B3/XXX
廠商： STMICROELECTRONICS
元件分類： 微控制器/微處理器
英文描述： 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PDIP32
封裝： 0.400 INCH, PLASTIC, SDIP-32
文件頁數(shù)： 44/133頁
文件大?。?/td> 2615K
代理商： ST72141K2B3/XXX
Obsolete
Product(s)
- Obsolete
Product(s)
ST72141K2
18/133
3.1 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 VLVDf reference
value. This means that it secures the power-up as
well as the power-down keeping the ST7 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 10.
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.
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.
Figure 10. Low Voltage Detector vs Reset
VDD
VLVDr
RESET
VLVDf
HYSTERISIS
VLVDhyst
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