ST7FLITE25F1B6 datasheet(122/166 Pages) STMICROELECTRONICS

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Electrical characteristics

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Doc ID 8349 Rev 5

13.3.3

Auxiliary voltage detector (AVD) thresholds

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

13.3.4

Internal RC oscillator and PLL

The ST7 internal clock can be supplied by an internal RC oscillator and PLL (selectable by

option byte).

The RC oscillator and PLL characteristics are temperature-dependent and are grouped in

four tables.

Table 62.

AVD thresholds

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

VIT+(AVD)

1=>0 AVDF flag toggle threshold

(VDD rise)

High Threshold

Med. Threshold

Low Threshold

4.40(1)

3.90(1)

3.20(1)

4.70

4.10

3.40

5.00

4.30

3.60

VIT-(AVD)

0=>1 AVDF flag toggle threshold

(VDD fall)

High Threshold

Med. Threshold

Low Threshold

4.30

3.70

2.90

4.60

3.90

3.20

4.90(1)

4.10(1)

3.40(1)

Vhys

AVD voltage threshold hysteresis

VIT+(AVD)-VIT-(AVD)

−

150

−

ΔVIT-

Voltage drop between AVD flag set and

LVD reset activation

VDD fall

−

0.45

−

Not tested in production.

Table 63.

Internal RC oscillator and PLL

Symbol

Parameter

Min

Typ

Max

Unit

VDD(RC)

Internal RC Oscillator operating voltage

2.4

−

5.5

VDD(x4PLL)

x4 PLL operating voltage

2.4

−

3.3

VDD(x8PLL)

x8 PLL operating voltage

3.3

−

5.5

tSTARTUP

PLL Startup time

−

PLL

input

clock

(fPLL)

cycles

Table 64.

RC oscillator and PLL characteristics (tested for TA = -40 to +85°C) @ VDD =4.5 to

5.5 V

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

fRC

(1)

Internal RC oscillator

frequency (1)

RCCR = FF (reset value), TA=25 °C,

VDD=5 V

−

760

−

kHz

RCCR = RCCR0(2), TA=25 °C, VDD=5 V

−

1000

−

ACCRC

Accuracy of Internal RC

oscillator with

RCCR=RCCR0(2)

TA=25° C, VDD=4.5 to 5.5 V

-1

−

+1%

TA=-40 to +85 °C, VDD=5 V

-5

−

TA=0 to +85° C, VDD=4.5 to 5.5 V

-2 (3)

−

+2(3)

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