ST72321R7-Auto datasheet(189/243 Pages) STMICROELECTRONICS

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ST72321xx-Auto

Electrical characteristics

Doc ID 13829 Rev 1

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19.3.2

Operating conditions with low voltage detector (LVD)

Subject to general operating conditions for VDD, fCPU, and TA.

19.3.3

Auxiliary voltage detector (AVD) thresholds

Subject to general operating conditions for VDD, fCPU, and TA.

Table 108.

Operating conditions with low voltage detector (LVD)

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

VIT+(LVD)

Reset release threshold

(VDD rise)

VD level = High in option byte

4.0(1)

4.2

4.5

VD level = Med. in option byte(2)

3.55(1)

3.75

4.0(1)

VD level = Low in option byte(2)

2.95(1)

3.15

3.35(1)

VIT-(LVD)

Reset generation threshold

(VDD fall)

VD level = High in option byte

3.8

4.0

4.25(1)

VD level = Med. in option byte(2)

3.35(1)

3.55

3.75(1)

VD level = Low in option byte(2)

2.8(1)

3.0

3.15(1)

Vhys(LVD)

LVD voltage threshold

hysteresis

VIT+(LVD)-VIT-(LVD)

200

VtPOR

VDD rise time

(2)(3)

LVD enabled

6µs/V

100ms/V

tg(VDD)

VDD glitches filtered (not

detected) by LVD(4)

Data based on characterization results, tested in production for ROM devices only

Data based on characterization results, not tested in production

When VtPOR is faster than 100µs/V, the Reset signal is released after a delay of maximum 42µs after VDD crosses the

VIT+(LVD) threshold.

If the medium or low thresholds are selected, the detection may occur outside the specified operating voltage range. Below

3.8V, device operation is not guaranteed.

Table 109.

Auxiliary voltage detector (AVD) thresholds

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

VIT+(AVD)

0 AVDF flag toggle threshold

(VDD rise)

VD level = High in option byte

4.4(1)

4.6

4.9(1)

VD level = Med. in option byte

3.95(1)

4.15

4.4(1)

VD level = Low in option byte

3.4(1)

3.6

3.8(1)

VIT-(AVD)

1 AVDF flag toggle threshold

(VDD fall)

VD level = High in option byte

4.2(1)

4.4

4.65(1)

VD level = Med. in option byte

3.75(1)

4.0

4.2(1)

VD level = Low in option byte

3.2(1)

3.4

3.6(1)

Vhys(AVD) AVD voltage threshold hysteresis

VIT+(AVD)-VIT-(AVD)

200

V

IT-

Voltage drop between AVD flag set

and LVD reset activated

VIT-(AVD)-VIT-(LVD)

450

Data based on characterization results, tested in production for ROM devices only

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