STM8L151X6 datasheet(92/147 Pages) STMICROELECTRONICS

92 / 147 page

Electrical parameters

STM8L151x6/8 STM8L152x6/8

92/147

DS6948 Rev 11

Figure 22. HSE oscillator circuit diagram

HSE oscillator critical gm formula

gmcrit

fHSE

()2 Rm

2Co C

()

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

LSE crystal/ceramic resonator oscillator

The LSE is available on STM8L151x6/8 and STM8L152x6/8 devices.

The LSE clock can be supplied with a 32.768 kHz 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...).

OSC_OUT

OSC_IN

fHSE to core

CL1

CL2

STM8

Resonator

Consumption

control

Resonator

MS32623V1

Table 32. LSE oscillator characteristics

Symbol

Parameter

Conditions

Min.

Typ.

Max.

Unit

fLSE

Low speed external oscillator

frequency

32.768

kHz

Feedback resistor

ΔV = 200 mV

1.2

C(1)(2)

Recommended load capacitance

IDD(LSE) LSE oscillator power consumption

VDD = 1.8 V

450

VDD = 3 V

600

VDD = 3.6 V

750

Oscillator transconductance

3(3)

µA/V

tSU(LSE)(4) Startup time

VDD is stabilized

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

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

Refer to crystal manufacturer for more details.

3. Guaranteed by design.

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