STM8L151K6U3 STMICROELECTRONICS [STMicroelectronics], STM8L151K6U3 Datasheet - Page 70

• 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]

Electrical parameters
Table 26.
1. C=
2. The oscillator selection can be optimized in terms of supply current using a high quality resonator with small R
3. Data based on characterization results, not tested in production.
4. t
Figure 12. HSE oscillator circuit diagram
70/101
t
SU(HSE)
Symbol
I
R
L
C
DD(HSE)
m
m
m
Refer to crystal manufacturer for more details
value is measured for a standard crystal resonator and it can vary significantly with the crystal manufacturer.
f
C
SU(HSE)
HSE
R
g
Resonator
(1)
m
C
F
L1
C
(4)
=
O
C
is the startup time measured from the moment it is enabled (by software) to a stabilized 16 MHz oscillation. This
L2
High speed external oscillator
frequency
Feedback resistor
Recommended load capacitance
HSE oscillator power consumption
Oscillator transconductance
Startup time
is approximately equivalent to 2 x crystal Cload.
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...).
HSE oscillator characteristics
HSE oscillator critical g
R
C
C
g
g
m
m
m
L1
mcrit
: Notional resistance (see crystal specification), L
: Notional capacitance (see crystal specification), Co: Shunt capacitance (see crystal specification),
>> g
=C
L2
mcrit
=C: Grounded external capacitance
=
(
2
Parameter
×
Π
C
C
×
L1
L2
f
HSE
)
2
Resonator
×
m
R
m
formula
(
(2)
2Co
OSC_IN
OSC_OUT
Doc ID 15962 Rev 2
+
V
f
f
OSC
OSC
DD
C
Conditions
C = 20 pF,
C = 10 pF,
m
)
2
: Notional inductance (see crystal specification),
is stabilized
= 16 MHz
=16 MHz
R
g
F
m
Min
3.5
1
Consumption
TBD
TBD
Typ
control
1
STM8L151xx, STM8L152xx
f
HSE
to core
TBD (stabilized)
TBD (stabilized)
TBD (startup)
TBD (startup)
Max
16
STM8
m
value.
(3)
(3)
mA/V
MHz
Unit
mA
ms
kΩ
pF