Datasheet

Electrical characteristics STM8S003F3 STM8S003K3
62/103 DS7147 Rev 10
Figure 18. HSE oscillator circuit diagram
Table 33. HSE oscillator characteristics
Symbol Parameter Conditions Min Typ Max Unit
f
HSE
External high speed oscillator
frequency
-1-16MHz
R
F
Feedback resistor - - 220 - kΩ
C
(1)
Recommended load capacitance
(2)
---20pF
I
DD(HSE)
HSE oscillator power consumption
C = 20 pF,
f
OSC
= 16 MHz
--
6 (startup)
1.6 (stabilized)
(3)
mA
C = 10 pF,
f
OSC
= 16 MHz
--
6 (startup)
1.2 (stabilized)
(3)
g
m
Oscillator transconductance - 5 - - mA/V
t
SU(HSE)
(4)
Startup time V
DD
is stabilized - 1 - ms
1. C is approximately equivalent to 2 x crystal Cload.
2. The oscillator selection can be optimized in terms of supply current using a high quality resonator with small R
m
value.
Refer to crystal manufacturer for more details
3. Data based on characterization results.
4. t
SU(HSE)
is the start-up time measured from the moment it is enabled (by software) to a stabilized 16 MHz oscillation is
reached. This value is measured for a standard crystal resonator and it can vary significantly with the crystal manufacturer.
OSCOUT
OSCIN
f
HSE
to core
C
L1
R
F
STM8
Resonator
Consumption
control
g
m
R
m
C
m
L
m
Resonator
C
L2
C
O
MS36490V3
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