STM32G0C1NET7XTR datasheet(82/159 Pages) STMICROELECTRONICS

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Electrical characteristics

STM32G0C1xC/xE

82/159

DS13564 Rev 4

5.3.7

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 5.3.14. See

Figure 18 for recommended clock input waveform.

tWUSHDN

Wakeup time from

Shutdown mode

Transiting to Run mode;

HCLK = HSI16 = 16 MHz;

Regulator in Range 1

258

340

µs

tWULPRUN

Wakeup time from

Low-power run

mode(2)

Transiting to Run mode;

HSISYS = HSI16/8 = 2 MHz

µs

1. Based on characterization results, not tested in production.

2. Time until REGLPF flag is cleared in PWR_SR2.

Table 37. Low-power mode wakeup times(1) (continued)

Symbol

Parameter

Conditions

Typ

Max

Unit

Table 38. Regulator mode transition times(1)

Symbol

Parameter

Conditions

Typ

Max

Unit

tVOST

Transition times between regulator

Range 1 and Range 2(2)

HSISYS = HSI16

µs

1. Based on characterization results, not tested in production.

2. Time until VOSF flag is cleared in PWR_SR2.

Table 39. Wakeup time using LPUART(1)

Symbol

Parameter

Conditions

Typ

Max

Unit

tWULPUART

Wakeup time needed to calculate the maximum

LPUART baud rate allowing to wakeup up from Stop

mode when LPUART clock source is HSI16

Stop mode 0

1.7

µs

Stop mode 1

8.5

1. Guaranteed by design.

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

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

fHSE_ext User external clock source frequency

Voltage scaling

Range 1

-8

MHz

Voltage scaling

Range 2

-8

VHSEH

OSC_IN input pin high level voltage

0.7 VDDIO1

-VDDIO1

VHSEL

OSC_IN input pin low level voltage

VSS

-0.3 VDDIO1

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