ST7LITE49M datasheet(147/188 Pages) STMICROELECTRONICS

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ST7LITE49M

Electrical characteristics

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13.3.5

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).

Internal RC oscillator calibrated at 3.3 V

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

byte).

Table 72.

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

5.5

MHz

RCCR=RCCR0(1),

TA=25 °C,VDD=5 V

See Section 7.1.1: Internal RC oscillator

7.84

8.16

ACCRC

Accuracy of Internal

RC oscillator with

RCCR=RCCR01)

TA=25 °C, VDD=4.5 to 5 V

(2)

Tested in production at 5.0 V only

-2(3)

TDB stands for ‘to be determined’.

TA=0 to +85 °C,

VDD=4.5 to 5.5 V

(2)

-2.5

TA=0 to +125 °C,

VDD=4.5 to 5.5 V(2)

-3

TA=-40 to 0 °C,

VDD=4.5 to 5.5 V

(2)

-4

2.5

tsu(RC)

RC oscillator setup

time

TA=25 °C, VDD=5 V

4 (2)

µs

Table 73.

Internal RC oscillator characteristics (3.3 V calibration)

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

fRC

Internal RC oscillator

frequency

RCCR = FF (reset value),

TA=25 °C,VDD=3.3 V

4.3

MHz

RCCR = RCCR1(1),

TA=25 °C, VDD=3.3 V

7.84

8.16

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