Electrical characteristics
STM8S003F3 STM8S003K3
Table 33. HSE oscillator characteristics
Symbol
Parameter
Conditions
Min
Typ
Max
Unit
External high speed oscillator
frequency
fHSE
-
1
-
16
MHz
RF
Feedback resistor
-
-
-
-
220
-
-
kΩ
C(1)
Recommended load capacitance (2)
20
pF
C = 20 pF,
OSC = 16 MHz
6 (startup)
-
-
-
-
f
1.6 (stabilized)(3)
IDD(HSE) HSE oscillator power consumption
mA
C = 10 pF,
fOSC = 16 MHz
6 (startup)
1.2 (stabilized)(3)
gm
Oscillator transconductance
Startup time
-
5
-
-
-
-
mA/V
ms
(4)
tSU(HSE)
VDD is stabilized
1
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 Rm value.
Refer to crystal manufacturer for more details
3. Data based on characterization results, not tested in production.
4. tSU(HSE) is the start-up time measured from the moment it is enabled (by software) to a stabilized 24 MHz oscillation is
reached. This value is measured for a standard crystal resonator and it can vary significantly with the crystal manufacturer.
Figure 18. HSE oscillator circuit diagram
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