ST7265X View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

ST7265X

Low speed USB 8-bit MCU family with up to 32 KB Flash/ROM

STMicroelectronics 

ST7265x

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 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).

Figure 22. Low Voltage Detector vs Reset

VDD

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 Figure 22.

During a Low Voltage Detector Reset, the RESET

pin is held low, thus permitting the MCU to reset

other devices.

VIT+(LVD)

VIT-(LVD)

Vhyst

RESET

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