STM32L031C6 datasheet(67/118 Pages) STMICROELECTRONICS

Part #	STM32L031C6

Description	Access line ultra-low-power 32-bit MCU ARM-based Cortex-M0, up to 32KB Flash, 8KB SRAM, 1KB EEPROM, ADC

PDF	118 Pages

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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67 / 118 page

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STM32L031x4/6

Electrical characteristics

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 20.

Figure 20. High-speed external clock source AC timing diagram

Table 37. 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/CK_IN(2) input pin high

level voltage

2. HSE external user clock is applied to OSC_IN on LQFP48 package and to CK_IN on other packages.

0.7VDD

-VDD

VHSEL

OSC_IN/CK_IN(2) input pin low

level voltage

VSS

-0.3VDD

tw(HSE)

OSC_IN/CK_IN(2) high or low time

tr(HSE)

tf(HSE)

OSC_IN/CK_IN(2) rise or fall time

Cin(HSE)

OSC_IN/CK_IN(2) input capacitance

2.6

DuCy(HSE) Duty cycle

OSC_IN/CK_IN(2) Input leakage

current

VSS  VIN  VDD

±1

µA

STM32L031C6 Datasheet(PDF) 67 Page - STMicroelectronics

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