ST72321B datasheet(141/187 Pages) STMICROELECTRONICS

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OPERATING CONDITIONS (Cont’d)

12.3.2 Operating Conditions with Low Voltage Detector (LVD)

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

Notes:

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

2. 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.

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

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

VIT+(LVD) threshold.

12.3.3 Auxiliary Voltage Detector (AVD) Thresholds

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

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

12.3.4 External Voltage Detector (EVD) Thresholds

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

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

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

VIT+(LVD)

Reset release threshold

(VDD rise)

VD level = High in option byte

4.01)

4.2

4.5

VD level = Med. in option byte2)

VD level = Low in option byte2)

3.551)

2.951)

3.75

3.15

4.01)

3.351)

VIT-(LVD)

Reset generation threshold

(VDD fall)

VD level = High in option byte

3.8

4.0

4.251)

VD level = Med. in option byte2)

VD level = Low in option byte2)

3.351)

2.81)

3.55

3.0

3.751))

3.15 1)

Vhys(LVD)

LVD voltage threshold hysteresis VIT+(LVD)-VIT-(LVD)

200

VtPOR

VDD rise time

3)2)

LVD enabled

µs/V

100ms/V

tg(VDD)

VDD glitches filtered (not detect-

ed) by LVD 3)

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

VIT+(AVD)

⇒0 AVDF flag toggle threshold

(VDD rise)

VD level = High in option byte

4.41)

4.6

4.91)

VD level = Med. in option byte

VD level = Low in option byte

3.95 1)

3.4 1)

4.15

3.6

4.41)

3.81)

VIT-(AVD)

⇒1 AVDF flag toggle threshold

(VDD fall)

VD level = High in option byte

4.21)

4.4

4.65 1)

VD level = Med. in option byte

VD level = Low in option byte

3.751)

3.21)

4.0

3.4

4.2 1)

3.61)

Vhys(AVD)

AVD voltage threshold hysteresis

VIT+(AVD)-VIT-(AVD)

200

∆VIT-

Voltage drop between AVD flag set

and LVD reset activated

VIT-(AVD)-VIT-(LVD)

450

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

VIT+(EVD)

⇒0 AVDF flag toggle threshold

(VDD rise)

1.15

1.26

1.35

VIT-(EVD)

⇒1 AVDF flag toggle threshold

(VDD fall)

1.1

1.2

1.3

Vhys(EVD)

EVD voltage threshold hysteresis

VIT+(EVD)-VIT-(EVD)

200

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