STM32L151VD datasheet(73/140 Pages) STMICROELECTRONICS

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STM32L151xD STM32L152xD

Electrical characteristics

Doc ID 022027 Rev 6

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Low-speed external user clock generated from an external source

The characteristics given in the following table result from tests performed using a low-

speed external clock source, and under ambient temperature and supply voltage conditions

summarized in Table 14.

Figure 13.

Low-speed external clock source AC timing diagram

Table 27.

Low-speed external user clock characteristics(1)

Guaranteed by design, not tested in production

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

0.7VDD

-VDD

VLSEL

OSC32_IN input pin low level

voltage

VSS

-0.3VDD

tw(LSE)

OSC32_IN high or low time

465

tr(LSE)

tf(LSE)

OSC32_IN rise or fall time

CIN(LSE)

OSC32_IN input capacitance

0.6

DuCy(LSE) Duty cycle

OSC32_IN Input leakage current

VSS ≤ VIN ≤ VDD

±1

µA

ai18233

OSC32_IN

EXTER NAL

STM32Lxx

CLOCK SOURC E

VLSEH

tf(LSE)

tW(LSE)

90%

10%

TLSE

tr(LSE)

tW(LSE)

fLSE_ext

VLSEL

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