STM32L151CCH7DTR 데이터 시트보기 (PDF) - STMicroelectronics

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STM32L151CCH7DTR

Ultra-low-power 32-bit MCU ARM®-based Cortex®-M3, 256KB Flash, 32KB SRAM, 8KB EEPROM, LCD, USB, ADC, DAC

STMicroelectronics 

Electrical characteristics

STM32L151xC STM32L152xC

Table 29. HSE oscillator characteristics(1)(2)

Symbol

Parameter

Conditions

Min Typ

Max

Unit

fOSC_IN

Oscillator frequency

-

1

24

RF

Feedback resistor

-

- 200

-

Recommended load

capacitance versus

C

equivalent serial

RS = 30 Ω

- 20

-

resistance of the crystal

(RS)(3)

VDD= 3.3 V,

IHSE

HSE driving current

VIN = VSS with 30 pF -

-

3

load

MHz

kΩ

pF

mA

IDD(HSE)

HSE oscillator power

consumption

C = 20 pF

fOSC = 16 MHz

--

2.5 (startup)

0.7 (stabilized)

mA

C = 10 pF

fOSC = 16 MHz

-

-

2.5 (startup)

0.46 (stabilized)

gm

Oscillator

transconductance

Startup

3.5 -

-

mA /V

tSU(HSE)(4) Startup time

VDD is stabilized

-

1

-

ms

1. Resonator characteristics given by the crystal/ceramic resonator manufacturer.

2. Guaranteed by characterization results.

3. The relatively low value of the RF resistor offers a good protection against issues resulting from use in a humid

environment, due to the induced leakage and the bias condition change. However, it is recommended to take this point into

account if the MCU is used in tough humidity conditions.

4.

rtSeUa(cHhSeEd).isThthise

startup

value is

time measured from the moment it is enabled (by software) to a stabilized 8 MHz oscillation is

measured for a standard crystal resonator and it can vary significantly with the crystal manufacturer.

For CL1 and CL2, it is recommended to use high-quality external ceramic capacitors in the

5 pF to 25 pF range (typ.), designed for high-frequency applications, and selected to match

the requirements of the crystal or resonator (see Figure 17). CL1 and CL2 are usually the

same size. The crystal manufacturer typically specifies a load capacitance which is the

series combination of CL1 and CL2. PCB and MCU pin capacitance must be included (10 pF

can be used as a rough estimate of the combined pin and board capacitance) when sizing

CL1 and CL2. Refer to the application note AN2867 “Oscillator design guide for ST

microcontrollers” available from the ST website www.st.com.

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DocID022799 Rev 13

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