STM32L152R8U6DTR(2013) 查看數據表（PDF） - STMicroelectronics

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STM32L152R8U6DTR
(Rev.:2013)

Ultra-low-power 32-bit MCU ARM®-based Cortex®-M3, 128KB Flash, 16KB SRAM, 4KB EEPROM, LCD, USB, ADC, DAC

STMicroelectronics 

Electrical characteristics

STM32L151x6/8/B, STM32L152x6/8/B

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.

Table 27. Low-speed external user clock characteristics(1)

Symbol

Parameter

Conditions

Min

Typ

Max Unit

fLSE_ext

User external clock source

frequency

1 32.768 1000 kHz

VLSEH

VLSEL

OSC32_IN input pin high level

voltage

OSC32_IN input pin low level

voltage

0.7VDD

VSS

VDD

V

0.3VDD

tw(LSE)

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

45

-

IL

OSC32_IN Input leakage current VSS ≤ VIN ≤ VDD

-

-

1. Guaranteed by design, not tested in production

-

ns

10

-

pF

55

%

±1 µA

Figure 14. Low-speed external clock source AC timing diagram

VLSEH

VLSEL

90%

10%

tr(LSE)

tf(LSE)

TLSE

tW(LSE)

tW(LSE) t

EXTER NAL

CLOCK SOURC E

fLSE_ext

OSC32_IN

IL

STM32Lxx

ai18233

66/121

Doc ID 17659 Rev 8

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