STM32F050C4P7A View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

STM32F050C4P7A

Low- and medium-density advanced ARM™-based 32-bit MCU with up to 32 Kbytes Flash, timers, ADC and comm. interfaces

STMicroelectronics 

STM32F050xx

Electrical characteristics

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 6.3.13. However,

the recommended clock input waveform is shown in Figure 13.

Table 30. Low-speed external user clock characteristics

Symbol

Parameter(1)

Conditions

Min

Typ

Max Unit

fLSE_ext

VLSEH

VLSEL

User External clock source

frequency

OSC32_IN input pin high level

voltage

OSC32_IN input pin low level

voltage

-

32.768 1000 kHz

0.7VDD

-

VDD

V

VSS

-

0.3VDD

tw(LSEH)

tw(LSEL)

OSC32_IN high or low time

tr(LSE)

tf(LSE)

OSC32_IN rise or fall time

1. Guaranteed by design, not tested in production.

450

-

-

-

-

ns

50

Figure 13. Low-speed external clock source AC timing diagram

T7,3%(

6,3%(





6,3%,

TR,3%

TF,3%

T7,3%,

T

4,3%

-36

Doc ID 023683 Rev 1

53/97

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