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STM8L15 데이터시트(PDF) 81 Page - STMicroelectronics

부품명 STM8L15
상세설명  8-bit ultralow power MCU, up to 32 KB Flash, 1 KB Data EEPROM RTC, LCD, timers, USART, I2C, SPI, ADC, DAC, comparators
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STM8L15 데이터시트(HTML) 81 Page - STMicroelectronics

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STM8L151xx, STM8L152xx
Electrical parameters
Doc ID 15962 Rev 5
81/122
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
RF
Feedback resistor
ΔV = 200 mV
1.2
M
Ω
C(1)
Recommended load capacitance (2)
8pF
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
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. Not tested in production.
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.
OSC_OUT
OSC_IN
fLSE
CL1
CL2
RF
STM8
Resonator
Consumption
control
gm
Rm
Cm
Lm
CO
Resonator



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