ST72651AR6 STMicroelectronics, ST72651AR6 Datasheet - Page 30

• Manufacturer Part Number: ST72651AR6
• Description: LOW-POWER, FULL-SPEED USB 8-BIT MCU WITH 32K FLASH, 5K RAM, FLASH CARD I/F, TIMER, PWM, ADC, I2C, SPI
• Manufacturer: STMicroelectronics

Specifications of ST72651AR6

• Dual Supply Management: analog voltage detector on the USB power line to enable smart power switching from USB power to battery (on E suffix devices).
• Programmable Internal Voltage Regulator For Memory Cards (2.8v To 3.5v) Supplying: Flash Card I/O lines (voltage shifting)
• 5 Usb Endpoints: 1 control endpoint
• Dtc (data Transfer Coprocessor): Universal Serial/Parallel communications interface, with software plug-ins for current and future protocol standards

ST72651AR6
6.3 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 V
value. This means that it secures the power-up as
well as the power-down, keeping the ST7 in reset.
The V
than the V
to avoid a parasitic reset when the MCU starts run-
ning and sinks current on the supply (hysteresis).
Figure 21. Low Voltage Detector vs Reset
30/161
1
RESET
V
V
DDA
IT+(LVD)
IT-(LVD)
IT-
reference value for a voltage drop is lower
supply voltage is below a V
IT+
reference value for power-on in order
V
DDA
IT-
reference
Doc ID 7215 Rev 4
The LVD Reset circuitry generates a reset when
V
The LVD function is illustrated in
During a Low Voltage Detector Reset, the RESET
pin is held low, thus permitting the MCU to reset
other devices.
Note: It is recommended to make sure that the
V
device is exiting from Reset, to ensure the applica-
tion functions properly.
V
DDA
DDA
hyst
– V
– V
supply voltage rises monotonously when the
is below:
IT+
IT-
when V
when V
DDA
DDA
is falling
is rising
Figure
21.