ST7LUS5 datasheet(94/124 Pages) STMICROELECTRONICS

94 / 124 page

Electrical characteristics

ST7LUS5, ST7LU05, ST7LU09

94/124

12.3.1

Internal RC oscillator

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

byte).

Note:

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

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

device.

Table 66.

Internal RC oscillator calibrated at 5.0V

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

fRC

Internal RC oscillator

frequency

RCCR = FF (reset value), TA =25°C, VDD = 5V

4.5

MHz

RCCR = RCCR0(1), TA = 25°C, VDD =5V

ACCRC

RC resolution

VDD = 5V

-2

Accuracy of internal RC

oscillator with

RCCR = RCCR0(1)

TA = 0°C to +125°C, VDD = 5V

-5

TA = -40°C to +125°C, VDD =4.5 to 5.5V

TBD

IDD(RC)

RC oscillator current

consumption

TA = 25°C, VDD = 5V

900(2)

µA

tsu(RC) RC oscillator setup time

TA = 25°C, VDD = 5V

4(2)

µs

See Internal RC oscillator adjustment on page 27

Guaranteed by Design

Table 67.

Internal RC oscillator calibrated at 3.3V

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

fRC

Internal RC oscillator

frequency

RCCR = FF (reset value), TA = 25°C, VDD = 3.3V

4.4

MHz

RCCR = RCCR1(1), TA = 25°C, VDD =3.3V

ACCRC

RC resolution

VDD = 3.3V

-2

Accuracy of internal RC

oscillator with

RCCR = RCCR1(1)

TA = 0°C to +125°C, VDD = 3.3V

-7

TA = -40°C to +125°C, VDD = 3.0 to 3.6V

TBD

IDD(RC)

RC oscillator current

consumption

TA = 25°C, VDD = 3.3V

900(2)

µA

tsu(RC) RC oscillator setup time

TA = 25°C, VDD = 3.3V

4(2)

µs

See Internal RC oscillator adjustment on page 27

Guaranteed by Design

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