STM8L151X6 datasheet(91/147 Pages) STMICROELECTRONICS

91 / 147 page

DS6948 Rev 11

91/147

STM8L151x6/8 STM8L152x6/8

Electrical parameters

124

LSE external clock (LSEBYP=1 in CLK_ECKCR)

The LSE is available on STM8L151xx and STM8L152xx devices only.

Subject to general operating conditions for VDD and TA.

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...).

Table 30. LSE external clock characteristics

Symbol

Parameter

Min.

Typ.

Max.

Unit

fLSE_ext(1)

External clock source frequency

32.768

kHz

VLSEH(2)

OSC32_IN input pin high level voltage

0.7 x VDD

VDD

VLSEL(2)

OSC32_IN input pin low level voltage

VSS

0.3 x VDD

Cin(LSE)(1)

OSC32_IN input capacitance

0.6

ILEAK_LSE

OSC32_IN input leakage current

±1

µA

1. Guaranteed by design.

2. Data based on characterization results.

Table 31. HSE oscillator characteristics

Symbol

Parameter

Conditions

Min.

Typ.

Max.

Unit

fHSE

High speed external oscillator

frequency

116

MHz

Feedback resistor

200

C(1)(2)

Recommended load capacitance

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(3)

mA/V

tSU(HSE)(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 small Rm value.

Refer to crystal manufacturer for more details

3. Guaranteed by design.

4. 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.

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