STM32F038C6T6 데이터 시트보기 (PDF) - STMicroelectronics

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STM32F038C6T6

ARM®-based 32-bit MCU with 32 Kbyte Flash, 9 timers, ADC and communication interfaces, 1.8 V

STMicroelectronics 

STM32F038x6

Electrical characteristics

Figure 15. Typical application with an 8 MHz crystal

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1. REXT value depends on the crystal characteristics.

069

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

IDD

LSE current consumption

gm

Oscillator

transconductance

low drive capability

medium-low drive capability

medium-high drive capability

high drive capability

low drive capability

medium-low drive capability

medium-high drive capability

-

0.5 0.9

-

-

1

µA

-

-

1.3

-

-

1.6

5

-

-

8

-

15

-

-

µA/V

-

high drive capability

25

-

-

tSU(LSE)(3)

Startup time

VDDIOx 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.

rteSaUc(LhSeEd).

is the startup

This value is

time measured

measured for a

from the moment it is enabled (by software)

standard crystal and it can vary significantly

to a stabilized 32.768 kHz oscillation

with the crystal manufacturer

is

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