MM32F103CET datasheet(52/89 Pages) MINDMOTION

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DS_MM32F103xx_o_Ver1.13

Electrical characteristics

214366

90%

10%

tr(LSE)

tf(LSE)

TLSE

tw(LSE)

VLSEH

VLSEL

fLSE_ext

OSC32_IN

I L

External Clock

Source

Figure 15. Low-speed external clock source AC timing diagram

High-speed external clock generated from a crystal/ceramic

resonator

The high-speed external (HSE) clock can be supplied with an 2 to 24 MHz crystal/ceramic

resonator oscillator. All the information given in this paragraph are based on design simu-

lation results obtained with typical external components specified in the table below. 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 characteris-

tics (frequency, package, accuracy...).

Table 20. HSE oscillator characteristics(1)(2)

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

fOSC_IN

Oscillator frequency

MHz

Feedback resistor

RS = 30Ω

1000

kΩ

CL1

CL2

(

The proposed load

capacitance corresponds to

the crystal serial impedance

(RS)

(

VDD = 3.3V

VIN = VSS

30pF load

HSE current consumption

Startup

Oscillator transconductance

VDD is stabilized

mA/V

tSU(HSE)

(

Startup time

RS = 30Ω

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

acteristics Parameter.

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