STLUX datasheet(99/126 Pages) STMICROELECTRONICS

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STLUX

Electrical characteristics

126

12.3.4

Internal clock sources and timing characteristics

HSI RC oscillator

Subject to general operating conditions for VDD and TA.

LSI RC oscillator

Subject to general operating conditions for VDD and TA.

PLL internal source clock

Table 79. HSI RC oscillator

Symbol

Parameter

Conditions

Min.(1)

1. Data based on characterization results, not tested in production.

Typ. Max.(1) Unit

fHSI

Frequency

MHz

ACCHSI

Accuracy of HSI oscillator

(factory calibrated)(1), (2)

2. Variation referred to fHSI nominal value.

VDD = 3.3 V

TA= 25 ºC

-1%

+1%

VDD = 3.3 V

-40 ºC

 TA  105 ºC

-4%

+4%

VDD = 5 V

-40 ºC

 TA  105 ºC

-4%

+4%

tSU(HSI)

HSI oscillator wake-up time

including calibration

1µs

Table 80. LSI RC oscillator

Symbol

Parameter

Conditions

Min.(1)

1. Guaranteed by design, not tested in production.

Typ.

Max.(1) Unit

fLSI

Frequency

153.6

kHz

ACCLSI Accuracy of LSI oscillator

3.3 V

 VDD  5 V

-40 ºC

 TA  105 ºC

-10%

10%

tSU(LSI) LSI oscillator wake-up time

µs

Table 81. PLL internal source clock

Symbol

Parameter

Conditions

Min.(1)

1. Data based on characterization results, not tested in production.

Typ.

Max.(1)

Unit

fIN

Input frequency(2)

2. PLL maximum input frequency 16 MHz.

3.3 V

 VDD  5 V

-40 ºC

 TA  105 ºC

MHz

fOUT

Output frequency

tlock

PLL lock time

200

µs

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