ST72561 datasheet(224/262 Pages) STMICROELECTRONICS

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ST72561

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12.3.2 Operating Conditions with Low Voltage Detector (LVD)

Subject to general operating conditions for TA.

Notes:

1. Data based on characterization results, not tested in production.

12.3.3 Auxiliary Voltage Detector (AVD) Thresholds

Subject to general operating conditions for TA.

1. Data based on characterization results, not tested in production.

Figure 120. LVD Startup Behaviour

Note: When the LVD is enabled, the MCU reaches its authorized operating voltage from a reset state.

However, in some devices, the reset signal may be undefined until VDD is approximately 2V. As a conse-

quence, the I/Os may toggle when VDD is below this voltage.

Because Flash write access is impossible below this voltage, the Flash memory contents will not be cor-

rupted.

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

VIT+(LVD)

Reset release threshold (VDD rise)

4.0 1)

4.2

4.5

VIT-(LVD)

Reset generation threshold (VDD fall)

3.8

4.0

4.25

Vhys(LVD)

LVD voltage threshold hysteresis1)

VIT+(LVD)-VIT-(LVD)

150

200

250

VtPOR

VDD rise time rate

µs/V

100

ms/V

tg(VDD)

Width of filtered glitches on VDD

(which are not detected by the LVD)1)

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

VIT+(AVD)

⇒0 AVDF flag toggle threshold

(VDD rise)

4.4 1)

4.6

4.9

VIT-(AVD)

⇒1 AVDF flag toggle threshold

(VDD fall)

4.2

4.4

4.651)

Vhys(AVD)

AVD voltage threshold hysteresis

VIT+(AVD)-VIT-(AVD)

250

∆V

IT-

Voltage drop between AVD flag set

and LVD reset activated

VIT-(AVD)-VIT-(LVD)

450

VIT+

LVD RESET

V D

Reset state

in this area

not defined

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