ST7FOXU0 datasheet(96/123 Pages) STMICROELECTRONICS

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Electrical characteristics

ST7FOXU0

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12.3.3

Internal RC oscillator

To improve clock stability and frequency accuracy, it is recommended to place a decoupling

capacitor, typically 100 nF, between the VDD and VSS pins as close as possible to the ST7

device

Internal RC oscillator calibrated at 5.0 V

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

byte).

Table 44.

Internal RC oscillator characteristics (5.0 V calibration)

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

fRC

Internal RC oscillator

frequency

RCCR = FF (reset value),

TA = 25 °C, VDD = 5 V

4.4

MHz

RCCR=RCCR0(1),

TA = 25 °C, VDD = 5 V

See Section 6.1.1: Internal RC oscillator

ACCRC

Accuracy of Internal

RC oscillator with

RCCR=RCCR01)

TA = 25 °C, VDD = 5 V

(2)

without user calibration

±7

TA = 25 °C, VDD = 4.5 to 5.5 V

(2)

with user calibration

-2

TA= 0 to +85 °C,

VDD = 4.5 to 5.5 V

(2)

with user calibration

Guaranteed by characterization

-2.5

TA = -40 to 0 °C,

VDD = 4.5 to 5.5 V

(2)

with user calibration

-4

2.5

tsu(RC)

RC oscillator setup

time

TA = 25 °C, VDD = 5 V

4 (3)

Not tested in production

µs

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