STM8S003K3 STM8S003F3
Electrical characteristics
(1) Data based on characterization results, not tested in production.
Figure 17: HSE external clock source
V
V
HSEH
HSEL
f
HSE
External clock
source
OSCIN
STM8
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 start-up stabilization time. Refer to the crystal resonator manufacturer for more details
(frequency, package, accuracy...).
Table 32: HSE oscillator characteristics
Symbol
Parameter
Conditions
Min Typ Max
Unit
fHSE
External high speed
oscillator frequency
1
16
20
MHz
RF
Feedback resistor
220
kΩ
pF
C(1)
Recommended load
capacitance(2)
IDD(HSE)
HSE oscillator power
consumption
C = 20 pF,
6 (startup)
1.6 (stabilized)(3)
fOSC = 16 MHz
mA
C = 10 pF,
6 (startup)
fOSC =16 MHz
1.2 (stabilized)(3)
gm
Oscillator
5
mA/V
ms
transconductance
(4)
tSU(HSE)
Startup time
VDD is stabilized
1
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