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STM8L051F3 Datasheet(PDF) 62 Page - STMicroelectronics

Part # STM8L051F3
Description  8-bit ultra-low-power MCU, 8-Kbyte Flash memory, 256-byte data EEPROM, RTC, timers, USART, I2C, SPI, ADC
PDF  96 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STM8L051F3 Datasheet(HTML) 62 Page - STMicroelectronics

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Electrical parameters
STM8L051F3
62/96
DS9178 Rev 4
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 13. LSE oscillator circuit diagram
Table 29. LSE oscillator characteristics
Symbol
Parameter
Conditions
Min
Typ
Max
Unit
fLSE
Low speed external oscillator
frequency
-
-
32.768
-
kHz
RF
Feedback resistor
ΔV = 200 mV
-
1.2
-
M
Ω
C(1)
Recommended load capacitance (2)
--
8
-
pF
IDD(LSE) LSE oscillator power consumption
--
-
1.4(3)
µA
VDD = 1.8 V
-
450
-
nA
VDD = 3 V
-
600
-
VDD = 3.6 V
-
750
-
gm
Oscillator transconductance
-
3(3)
--
µA/V
tSU(LSE)(4) Startup time
VDD is stabilized
-
1
-
s
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.
4.
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.



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