STM32F030C8P6TR(2013) 데이터 시트보기 (PDF) - STMicroelectronics

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STM32F030C8P6TR
(Rev.:2013)

Value-line ARM®-based 32-bit MCU with up to 256-KB Flash, timers, ADC, communication interfaces, 2.4-3.6 V operation

STMicroelectronics 

STM32F030x4 STM32F030x6 STM32F030x8

Electrical characteristics

Figure 14. Typical application with an 8 MHz crystal

Resonator with

integrated capacitors

CL1

8 MH z

resonator

OSC_IN

RF

Bias

controlled

gain

fHS E

CL2

REXT(1)

OSC_OU T

MS19876V1

1. REXT value depends on the crystal characteristics.

Low-speed external clock generated from a crystal resonator

The low-speed external (LSE) clock can be supplied with a 32.768 kHz crystal resonator

oscillator. All the information given in this paragraph are based on design simulation results

obtained with typical external components specified in Table 32. In the application, the

resonator and the load capacitors have to be placed as close as possible to the oscillator

pins in order to minimize output distortion and startup stabilization time. Refer to the crystal

resonator manufacturer for more details on the resonator characteristics (frequency,

package, accuracy).

Symbol

Table 32. LSE oscillator characteristics (fLSE = 32.768 kHz)

Parameter

Conditions(1)

Min(2) Typ Max(2) Unit

LSEDRV[1:0]=00

lower driving capability

-

0.5

-

IDD LSE current consumption

LSEDRV[1:0]= 01

medium low driving capability

LSEDRV[1:0] = 10

medium high driving capability

-

0.8

-

µA

-

1.1

-

LSEDRV[1:0]=11

higher driving capability

-

1.4

-

LSEDRV[1:0]=00

lower driving capability

5

-

-

gm

Oscillator

transconductance

LSEDRV[1:0]= 01

medium low driving capability

LSEDRV[1:0] = 10

medium high driving capability

8

-

15

-

-

µA/V

-

LSEDRV[1:0]=11

higher driving capability

25

-

-

tSU(LSE)(3) Startup time

VDD is stabilized

-

2

-

s

1. Refer to the note and caution paragraphs below the table, and to the application note AN2867 “Oscillator

design guide for ST microcontrollers”.

2. Guaranteed by design, not tested in production.

3. tSU(LSE) is the startup time measured from the moment it is enabled (by software) to a stabilized 32.768 kHz

oscillation is reached. This value is measured for a standard crystal and it can vary significantly with the

crystal manufacturer

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