Datasheet

Electrical characteristics STM32F303xB STM32F303xC
80/149 DS9118 Rev 14
Figure 17. Typical application with a 32.768 kHz crystal
Note: An external resistor is not required between OSC32_IN and OSC32_OUT and it is forbidden
to add one.
6.3.8 Internal clock source characteristics
The parameters given in Table 44 are derived from tests performed under ambient
temperature and supply voltage conditions summarized in Table 24.
High-speed internal (HSI) RC oscillator
MS30253V2
OSC32_IN
OSC32_OUT
Drive
programmable
amplifier
f
LSE
32.768 kHz
resonator
Resonator with integrated
capacitors
C
L1
C
L2
Table 44. HSI oscillator characteristics
(1)
1. V
DDA
= 3.3 V, T
A
= –40 to 105 °C unless otherwise specified.
Symbol Parameter Conditions Min Typ Max Unit
f
HSI
Frequency - - 8 - MHz
TRIM HSI user trimming step - - - 1
(2)
2. Guaranteed by design.
%
DuCy
(HSI)
Duty cycle - 45
(2)
-55
(2)
%
ACC
HSI
Accuracy of the HSI oscillator
T
A
= -40 to
105°C
-2.8
(3)
3. Guaranteed by characterization results.
-3.8
(3)
%
T
A
= -10 to 85°C -1.9
(3)
-2.3
(3)
T
A
= 0 to 85°C -1.9
(3)
-2
(3)
T
A
= 0 to 70°C -1.3
(3)
-2
(3)
T
A
= 0 to 55°C -1
(3)
-2
(3)
T
A
= 25°C
(4)
4. Factory calibrated, parts not soldered.
-1 - 1
t
su(HSI)
HSI oscillator startup time - 1
(2)
-2
(2)
µs
I
DDA(HSI)
HSI oscillator power
consumption
- - 80 100
(2)
µA
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