STM32F302CC Просмотр технического описания (PDF) - STMicroelectronics

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STM32F302CC

ARM®-based Cortex®-M4 32b MCU+FPU, up to 256KB Flash+ 40KB SRAM, 2 ADCs, 1 DAC ch., 4 comp, 2 PGA, timers, 2.0-3.6 V

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Electrical characteristics

STM32F302xB STM32F302xC

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 6.3.14. However, the

recommended clock input waveform is shown in Figure 15

Symbol

Table 41. Low-speed external user clock characteristics

Parameter

Conditions

Min

Typ

Max Unit

fLSE_ext

User External clock source

frequency(1)

VLSEH

OSC32_IN input pin high level

voltage

VLSEL

OSC32_IN input pin low level

voltage

tw(LSEH)

tw(LSEL)

OSC32_IN high or low time(1)

tr(LSE)

tf(LSE)

OSC32_IN rise or fall time(1)

1. Guaranteed by design.

-

32.768 1000 kHz

0.7VDD

-

VDD

V

-

VSS

-

0.3VDD

450

-

-

-

-

ns

50

Figure 15. Low-speed external clock source AC timing diagram

9/6(+

9/6(/





WU/6(

WZ/6(+

WI/6(

7/6(

WZ/6(/

W

069

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