STM8L15 datasheet(80/122 Pages) STMICROELECTRONICS

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Electrical parameters

STM8L151xx, STM8L152xx

80/122

Doc ID 15962 Rev 5

HSE crystal/ceramic resonator oscillator

The HSE clock can be supplied with a 1 to 16 MHz crystal/ceramic resonator oscillator. All

the information given in this paragraph is based on characterization results with specified

typical external components. 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

(frequency, package, accuracy...).

Figure 17.

HSE oscillator circuit diagram

HSE oscillator critical gm formula

Rm: Motional resistance (see crystal specification), Lm: Motional inductance (see crystal specification),

Cm: Motional capacitance (see crystal specification), Co: Shunt capacitance (see crystal specification),

CL1=CL2=C: Grounded external capacitance

gm >> gmcrit

Table 30.

HSE oscillator characteristics

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

fHSE

High speed external oscillator

frequency

116

MHz

Feedback resistor

200

C(1)

Recommended load capacitance (2)

IDD(HSE)

HSE oscillator power consumption

C = 20 pF,

fOSC = 16 MHz

2.5 (startup)

0.7 (stabilized)(3)

C = 10 pF,

fOSC =16 MHz

2.5 (startup)

0.46 (stabilized)(3)

Oscillator transconductance

3.5

mA/V

tSU(HSE)

(4) Startup time

VDD is stabilized

C=CL1=CL2 is approximately equivalent to 2 x crystal CLOAD.

The oscillator selection can be optimized in terms of supply current using a high quality resonator with small Rm value.

Refer to crystal manufacturer for more details

Guaranteed by design. Not tested in production.

tSU(HSE) is the startup time measured from the moment it is enabled (by software) to a stabilized 16 MHz oscillation. This

value is measured for a standard crystal resonator and it can vary significantly with the crystal manufacturer.

OSC_OUT

OSC_IN

fHSE to core

CL1

CL2

STM8

Resonator

Consumption

control

Resonator

mcrit

HSE

()2 R

2Co

()

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