STM32F100R4H7BTR(2010) 查看數據表（PDF） - STMicroelectronics

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STM32F100R4H7BTR
(Rev.:2010)

Low & medium-density value line, advanced ARM-based 32-bit MCU with 16 to 128 KB Flash, 12 timers, ADC, DAC & 8 comm interfaces

STMicroelectronics 

Electrical characteristics

STM32F100x4, STM32F100x6, STM32F100x8, STM32F100xB

Note:

Caution:

For CL1 and CL2 it is recommended to use high-quality ceramic capacitors in the 5 pF to

15 pF range selected to match the requirements of the crystal or resonator. 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.

Load capacitance CL has the following formula: CL = CL1 x CL2 / (CL1 + CL2) + Cstray where

Cstray is the pin capacitance and board or trace PCB-related capacitance. Typically, it is

between 2 pF and 7 pF.

To avoid exceeding the maximum value of CL1 and CL2 (15 pF) it is strongly recommended

to use a resonator with a load capacitance CL  7 pF. Never use a resonator with a load

capacitance of 12.5 pF.

Example: if you choose a resonator with a load capacitance of CL = 6 pF, and Cstray = 2 pF,

then CL1 = CL2 = 8 pF.

Table 22. LSE oscillator characteristics (fLSE = 32.768 kHz)(1)

Symbol

Parameter

Conditions

Min Typ Max Unit

RF

Feedback resistor

5

M

CL1

CL2(2)

Recommended load capacitance

versus equivalent serial

resistance of the crystal (RS)(3)

RS = 30 K

15 pF

I2

LSE driving current

VDD = 3.3 V

VIN = VSS

1.4 µA

gm

Oscillator transconductance

tSU(LSE)(4) Startup time

5

VDD is stabilized

3

µA/V

s

1. Based on characterization, not tested in production.

2. Refer to the note and caution paragraphs above the table.

3. The oscillator selection can be optimized in terms of supply current using an high quality resonator with

small RS value for example MSIV-TIN32.768 kHz. Refer to crystal manufacturer for more details

4. tSU(LSE) is the startup time measured from the moment it is enabled (by software) to a stabilized

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

significantly with the crystal manufacturer

Figure 20. Typical application with a 32.768 kHz crystal

Resonator with

integrated capacitors

CL1

OSC32_IN

32.768 KH z

resonator

RF

OSC32_OU T

CL2

Bias

controlled

gain

fLSE

STM32F10xxx

ai14129b

48/84

Doc ID 16455 Rev 2

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