STM8L151G4Y3 STMICROELECTRONICS [STMicroelectronics], STM8L151G4Y3 Datasheet - Page 81

• Manufacturer Part Number: STM8L151G4Y3
• 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 31.
1. C=
2. The oscillator selection can be optimized in terms of supply current using a high quality resonator with a small R
3. Guaranteed by design. Not tested in production.
4.
Figure 18. 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 5
LOAD
V
ΔV = 200 mV
DD
V
V
Conditions
V
DD
DD
.
DD
is stabilized
= 1.8 V
= 3.6 V
= 3 V
R
g
F
m
Min
3
Consumption
32.768
control
Typ
450
600
750
1.2
8
1
f
LSE
Electrical parameters
1.4
Max
(3)
STM8
m
value.
81/122
µA/V
Unit
kHz
MΩ
µA
nA
pF
s