參數(shù)資料
型號： ST72C314J4
元件分類： 圖像傳感器
英文描述： CMOS Image Sensor
中文描述： CMOS圖像傳感器
文件頁數(shù)： 74/153頁
文件大?。?/td> 1988K
代理商： ST72C314J4
ST72334J/N, ST72314J/N, ST72124J
27/153
9.1 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 the Figure 13.
Provided the minimum VDD value (guaranteed for
the oscillator frequency) is above 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:
1. The LVD allows the device to be used without
any external RESET circuitry.
2. Three different reference levels are selectable
through the option byte according to the applica-
tion requirement.
LVD application note
Application software can detect a reset caused by
the LVD by reading the LVDRF bit in the CRSR
register.
This bit is set by hardware when a LVD reset is
generated and cleared by software (writing zero).
Figure 13. Low Voltage Detector vs Reset
VDD
VIT+
RESET
VIT-
Vhyst
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
ST72C314J4B1 制造商:STMicroelectronics 功能描述:ST72FLASH 8K - Bulk
ST72C314J4B6 功能描述:8位微控制器 -MCU Flash 16K SPI/SCI RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風格:SMD/SMT
ST72C314J4T1 制造商:STMicroelectronics 功能描述:ST72FLASH 8K - Bulk
ST72C314J4T6 功能描述:8位微控制器 -MCU Flash 16K SPI/SCI RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風格:SMD/SMT
ST72C314J4T6 PROGRAMMED 制造商:STMicroelectronics 功能描述:MCU 8-bit ST7 CISC 16KB Flash 3.3V/5V 44-Pin TQFP Tray
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