STM8L15 datasheet(81/122 Pages) STMICROELECTRONICS

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STM8L151xx, STM8L152xx

Electrical parameters

Doc ID 15962 Rev 5

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LSE crystal/ceramic resonator oscillator

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...).

Figure 18.

LSE oscillator circuit diagram

Table 31.

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)

Recommended load capacitance (2)

8pF

IDD(LSE)

LSE oscillator power consumption

1.4(3)

µA

VDD = 1.8 V

450

VDD = 3 V

600

VDD = 3.6 V

750

Oscillator transconductance

µA/V

tSU(LSE)

(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 a small Rm value.

Refer to crystal manufacturer for more details.

Guaranteed by design. Not tested in production.

tSU(LSE) is the startup time measured from the moment it is enabled (by software) to a stabilized 32.768 kHz oscillation.

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

OSC_OUT

OSC_IN

fLSE

CL1

CL2

STM8

Resonator

Consumption

control

Resonator

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