STM8L151K6U3 STMICROELECTRONICS [STMicroelectronics], STM8L151K6U3 Datasheet - Page 71

• Manufacturer Part Number: STM8L151K6U3
• Description: 8-bit ultralow power MCU, up to 32 KB Flash, 1 KB Data EEPROM RTC, LCD, timers, USART, I2C, SPI, ADC, DAC, comparators
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

STM8L151xx, STM8L152xx
Table 27.
1. C=
2. The oscillator selection can be optimized in terms of supply current using a high quality resonator with a small R
3. Data based on characterization results, not tested in production.
4.
Figure 13. LSE oscillator circuit diagram
t
SU(LSE)
Symbol
I
R
L
C
DD(LSE)
m
m
m
Refer to crystal manufacturer for more details
This value is measured for a standard crystal resonator and it can vary significantly with the crystal manufacturer.
f
C
t
LSE
R
g
Resonator
SU(LSE)
(1)
m
C
F
L1
C
(4)
=
O
C
L2
is the startup time measured from the moment it is enabled (by software) to a stabilized 32.768 kHz oscillation.
Low speed external oscillator
frequency
Feedback resistor
Recommended load capacitance
LSE oscillator power consumption
Oscillator transconductance
Startup time
is approximately equivalent to 2 x crystal C
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...).
LSE oscillator characteristics
Parameter
C
C
L1
L2
Resonator
OSC_OUT
(2)
OSC_IN
Doc ID 15962 Rev 2
V
LOAD
DD
Conditions
.
is stabilized
R
g
F
m
TBD
Min
Consumption
32.768
TBD
TBD
Typ
control
f
LSE
Electrical parameters
TBD
Max
(3)
STM8
m
value.
71/101
µA/V
Unit
kHz
ms
pF
µA
kΩ