ST7LITEUSX datasheet(70/108 Pages) STMICROELECTRONICS

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12.3.2 Operating Conditions with Low Voltage Detector (LVD)

TA = -40 to 125°C, unless otherwise specified

Notes:

1. Not tested in production.

2. Not tested in production. The VDD rise time rate condition is needed to ensure a correct device power-on and LVD reset

release. When the VDD slope is outside these values, the LVD may not release properly the reset of the MCU.

3. LVD and AVD high thresholds must not be selected at the same time.

4. Use of LVD with capacitive power supply: with this type of power supply, if power cuts occur in the application, it is

recommended to pull VDD down to 0V to ensure optimum restart conditions. Refer to circuit example in Figure 62 on page

87.

12.3.3 Auxiliary Voltage Detector (AVD) Thresholds

TA = -40 to 125°C, unless otherwise specified

Notes:

1. LVD and AVD high thresholds must not be selected at the same time.

2. Not tested in production, guaranteed by characterization.

Note: Refer to section 7.4.2.1 on page 29

Symbol

Parameter

Conditions 3)

Min

Typ

Max

Unit

VIT+(LVD)

Reset release threshold

(VDD rise)

High Threshold

Med. Threshold

Low Threshold

3.50

3.30

2.50

4.00

3.70

2.65

4.50

4.30

3.30

VIT-(LVD)

Reset generation threshold

(VDD fall)

High Threshold

Med. Threshold

Low Threshold

3.30

3.20

2.40

3.80

3.50

2.70

4.40

4.20

3.20

Vhys

LVD voltage threshold hysteresis

VIT+(LVD)-VIT-(LVD)

150

VtPOR

VDD rise time rate

2) 4)

µs/V

IDD(LVD)

LVD/AVD current consumption

VDD = 5V

220

µA

Symbol

Parameter

Conditions 1)

Min 2)

Typ 2)

Max 2)

Unit

VIT+(AVD)

1=>0 AVDF flag toggle threshold

(VDD rise)

High Threshold

Med. Threshold

Low Threshold

3.50

3.30

2.50

4.10

3.90

3.00

4.80

4.60

3.50

VIT-(AVD)

0=>1 AVDF flag toggle threshold

(VDD fall)

High Threshold

Med. Threshold

Low Threshold

3.40

3.20

2.40

4.00

3.80

2.90

4.70

4.50

3.40

Vhys

AVD voltage threshold hysteresis

VIT+(AVD)-VIT-(AVD)

100

∆V

IT-

Voltage drop between AVD flag set

and LVD reset activation

VDD fall

0.45

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