STM32L082KB datasheet(72/132 Pages) STMICROELECTRONICS

部件名	STM32L082KB

功能描述	Ultra-low-power 32-bit MCU Arm®-based Cortex®-M0, up to 192KB Flash, 20KB SRAM, 6KB EEPROM, USB, ADC, DACs, AES

PDF	132 Pages

Scroll/Zoom	100%

制造商	STMICROELECTRONICS [STMicroelectronics]

网页	http://www.st.com

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72 / 132 page

Electrical characteristics

STM32L082xx

72/132

DS10688 Rev 7

6.3.6

External clock source characteristics

High-speed external user clock generated from an external source

In bypass mode the HSE oscillator is switched off and the input pin is a standard GPIO.The

external clock signal has to respect the I/O characteristics in Section 6.3.12. However, the

recommended clock input waveform is shown in Figure 16.

Figure 16. High-speed external clock source AC timing diagram

Table 40. High-speed external user clock characteristics(1)

1. Guaranteed by design.

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

fHSE_ext

User external clock source

frequency

CSS is ON or

PLL is used

MHz

CSS is OFF,

PLL not used

MHz

VHSEH

OSC_IN input pin high level voltage

-VDD

VHSEL

OSC_IN input pin low level voltage

VSS

tw(HSE)

OSC_IN high or low time

tr(HSE)

tf(HSE)

OSC_IN rise or fall time

Cin(HSE)

OSC_IN input capacitance

2.6

DuCy(HSE) Duty cycle

OSC_IN Input leakage current

VSS ≤VIN ≤VDD

±1

µA

ai18232c

OSC _IN

EXTER NAL

STM32Lxx

CLOCK SOURC E

VHSEH

tf(HSE)

tW(HSE)

90%

10%

THSE

tr(HSE)

tW(HSE)

fHSE_ext

VHSEL

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