ST7FOXU0 datasheet(95/123 Pages) STMICROELECTRONICS

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ST7FOXU0

Electrical characteristics

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12.3

Operating conditions

12.3.1

General operating conditions

TA = -40 to +85 °C unless otherwise specified.

12.3.2

Operating conditions with Low Voltage Detector (LVD)

TA = -40 to 85 °C unless otherwise specified.

Table 42.

General operating conditions

Symbol

Parameter

Conditions

Min

Max

Unit

VDD

Supply voltage

fCPU = 8 MHz max.

4.5

5.5

fCPU

CPU clock frequency

4.5 V

≤ V

DD≤5.5 V

up to 8

MHz

Table 43.

Operating characteristics with LVD

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

VIT+(LVD)

Reset release threshold

(VDD rise)

3.9

4.2

4.5

VIT-(LVD)

Reset generation threshold

(VDD fall)

3.7

4.0

4.3

Vhys

LVD voltage threshold hysteresis

VIT+(LVD)-VIT-(LVD)

150

VtPOR

VDD rise time rate

(1)(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.

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 0 V to ensure optimum restart conditions. Refer to

circuit example in Figure 39 on page 106.

µs/V

IDD(LVD)

LVD current consumption

VDD = 5 V

140

µA

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