STM32L151VD datasheet(75/140 Pages) STMICROELECTRONICS

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STM32L151xD STM32L152xD

Electrical characteristics

Doc ID 022027 Rev 6

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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 15). 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.

Table 28.

HSE 1-24 MHz oscillator characteristics(1)(2)

Resonator characteristics given by the crystal/ceramic resonator manufacturer.

Based on characterization results, not tested in production.

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

fOSC_IN Oscillator frequency

MHz

Feedback resistor

200

Recommended load

capacitance versus

equivalent serial resistance

of the crystal (RS)

(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.

RS = 30 Ω

-20

IHSE

HSE driving current

VDD= 3.3 V, VIN =VSS

with 30 pF load

IDD(HSE)

HSE oscillator power

consumption

C = 20 pF

fOSC = 16 MHz

2.5 (startup)

0.7 (stabilized)

C = 10 pF

fOSC = 16 MHz

2.5 (startup)

0.46 (stabilized)

Oscillator transconductance

Startup

3.5

tSU(HSE)

(4)

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

oscillation is reached. This value is measured for a standard crystal resonator and it can vary significantly

with the crystal manufacturer.

Startup time

VDD is stabilized

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