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STM8L152M8T6 Datasheet, PDF (89/134 Pages) STMicroelectronics – 8-bit ultralow power MCU, up to 64 KB Flash + 2 KB data EEPROM
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STM8L15xx8, STM8L15xR6
Electrical parameters
LSE external clock (LSEBYP=1 in CLK_ECKCR)
The LSE is available on STM8L151xx and STM8L152xx devices only.
Subject to general operating conditions for VDD and TA.
Symbol
Table 30. LSE external clock characteristics
Parameter
Min.
Typ.
Max.
Unit
fLSE_ext(1)
External clock source frequency
VLSEH(2)
OSC32_IN input pin high level voltage
VLSEL(2)
OSC32_IN input pin low level voltage
Cin(LSE)(1)
OSC32_IN input capacitance
ILEAK_LSE
OSC32_IN input leakage current
1. Guaranteed by design, not tested in production.
2. Data based on characterization results, not tested in production.
32.768
kHz
0.7 x VDD
VSS
VDD
V
0.3 x VDD
0.6
pF
±1
µA
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...).
Table 31. HSE oscillator characteristics
Symbol
Parameter
Conditions
Min. Typ.
Max.
Unit
fHSE
High speed external oscillator
frequency
1
16
MHz
RF
C(1)(2)
Feedback resistor
Recommended load capacitance
200
kΩ
20
pF
IDD(HSE) HSE oscillator power consumption
gm
Oscillator transconductance
tSU(HSE)(4) Startup time
C = 20 pF,
fOSC = 16 MHz
C = 10 pF,
fOSC =16 MHz
VDD is stabilized
3.5(3)
2.5 (startup)
0.7 (stabilized)(3)
mA
2.5 (startup)
0.46 (stabilized)(3)
mA/V
1
ms
1. C=CL1=CL2 is approximately equivalent to 2 x crystal CLOAD.
2.
The oscillator selection can be optimized in terms
Refer to crystal manufacturer for more details
of
supply
current
using
a
high
quality
resonator
with
small
Rm
value.
3. Guaranteed by design. Not tested in production.
4.
tvSaUlu(HeSiEs)
is the startup
measured for
time measured from the moment
a standard crystal resonator and
it
it
is enabled (by software) to a stabilized 16 MHz oscillation.
can vary significantly with the crystal manufacturer.
This
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