STM32F103V8H6TR View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

STM32F103V8H6TR

Medium-density performance line ARM-based 32-bit MCU with 64 or 128 KB Flash, USB, CAN, 7 timers, 2 ADCs, 9 com. interfaces

STMicroelectronics 

Electrical characteristics

STM32F103xC, STM32F103xD, STM32F103xE

Figure 21. Low-speed external clock source AC timing diagram

VLSEH

VLSEL

90%

10%

tr(LSE)

tf(LSE)

TLSE

tW(LSE)

tW(LSE) t

56/123

EXTER NAL

CLOCK SOURC E

fLSE_ext

OSC32_IN

IL

STM32F103xx

ai14144b

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

The high-speed external (HSE) clock can be supplied with a 4 to 16 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 23. 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).

Table 23. HSE 4-16 MHz oscillator characteristics(1)(2)

Symbol

Parameter

Conditions

Min Typ Max Unit

fOSC_IN Oscillator frequency

4

RF Feedback resistor

Recommended load capacitance

C

versus equivalent serial

resistance of the crystal (RS)(3)

RS = 30

i2

HSE driving current

VDD= 3.3 V, VIN = VSS

with 30 pF load

8 16 MHz

200

k

30

pF

1 mA

gm Oscillator transconductance

tSU(HSE)(4) Startup time

Startup

VDD is stabilized

25

2

mA/V

ms

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

2. Based on characterization results, not tested in production.

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

the requirements of the crystal or resonator (see Figure 22). CL1 and CL2 are usually the

Doc ID 14611 Rev 7

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