STM32F030RCT6 データシートの表示（PDF） - STMicroelectronics

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STM32F030RCT6

Value-line ARM®-based 32-bit MCU with up to 256-KB Flash, timers, ADC, communication interfaces, 2.4-3.6 V operation

STMicroelectronics 

STM32F030x4/x6/x8/xC

Electrical characteristics

Note:

Symbol

Table 33. HSE oscillator characteristics

Parameter

Conditions(1)

Min(2) Typ Max(2) Unit

During startup(3)

-

-

8.5

IDD HSE current consumption

VDD = 3.3 V,

Rm = 45 Ω,

-

0.5

-

CL = 10 pF@8 MHz

mA

VDD = 3.3 V,

Rm = 30 Ω,

-

1.5

-

CL = 20 pF@32 MHz

gm Oscillator transconductance

tSU(HSE)(4) Startup time

Startup

VDD is stabilized

10

-

-

2

- mA/V

-

ms

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

2. Guaranteed by design, not tested in production.

3. This consumption level occurs during the first 2/3 of the tSU(HSE) startup time

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

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

5 pF to 20 pF range (Typ.), designed for high-frequency applications, and selected to match

the requirements of the crystal or resonator (see Figure 16). 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.

For information on selecting the crystal, refer to the application note AN2867 “Oscillator

design guide for ST microcontrollers” available from the ST website www.st.com.

Figure 16. Typical application with an 8 MHz crystal

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1. REXT value depends on the crystal characteristics.

Low-speed external clock generated from a crystal resonator

The low-speed external (LSE) clock can be supplied with a 32.768 kHz crystal resonator

oscillator. All the information given in this paragraph are based on design simulation results

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