STM32L152CBT6 查看數據表（PDF） - STMicroelectronics

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STM32L152CBT6

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

STMicroelectronics 

STM32L151x6/8/B STM32L152x6/8/B

Electrical characteristics

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 13.

Symbol

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

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

-

VDD

V

-

VSS

-

0.3VDD

tw(LSEH)

tw(LSEL)

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.

-

ns

10

-

pF

55

%

±1

µA

Figure 16. Low-speed external clock source AC timing diagram

WZ/6(+

9/6(+





9/6(/

WU/6(

WI/6(

WZ/6(/

W

7/6(

069

High-speed external clock generated from a crystal/ceramic resonator

The high-speed external (HSE) clock can be supplied with a 1 to 24 MHz crystal/ceramic

resonator oscillator. All the information given in this paragraph are based on

characterization results obtained with typical external components specified in Table 28. In

the application, the resonator and the load capacitors have to be placed as close as

possible to the oscillator pins in order to minimize output distortion and startup stabilization

time. Refer to the crystal resonator manufacturer for more details on the resonator

characteristics (frequency, package, accuracy).

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