STM32G071C8 datasheet(69/133 Pages) STMICROELECTRONICS

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DS12232 Rev 3

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STM32G071x8/xB

Electrical characteristics

106

Low-speed external user clock generated from an external source

In bypass mode the LSE 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 5.3.14. See

Figure 17 for recommended clock input waveform.

Figure 17. Low-speed external clock source AC timing diagram

High-speed external clock generated from a crystal/ceramic resonator

The high-speed external (HSE) clock can be supplied with a 4 to 48 MHz crystal/ceramic

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

simulation results obtained with typical external components specified in Table 39. 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).

Table 38. Low-speed external user clock characteristics(1)

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

fLSE_ext User external clock source frequency

32.768

1000

kHz

VLSEH OSC32_IN input pin high level voltage

0.7 VDDIO1

-VDDIO1

VLSEL

OSC32_IN input pin low level voltage

VSS

0.3 VDDIO1

tw(LSEH)

tw(LSEL)

OSC32_IN high or low time

250

1. Guaranteed by design.

MS19215V2

VLSEH

tf(LSE)

90%

10%

TLSE

tr(LSE)

VLSEL

tw(LSEH)

tw(LSEL)

Table 39. HSE oscillator characteristics(1)

Symbol

Parameter

Conditions(2)

Min

Typ

Max

Unit

fOSC_IN

Oscillator frequency

MHz

Feedback resistor

200

kΩ

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