Datasheet

DS9716 Rev 11 79/139
STM32F401xB STM32F401xC Electrical characteristics
113
Figure 25. Typical application with a 32.768 kHz crystal
6.3.9 Internal clock source characteristics
The parameters given in Table 39 and Table 40 are derived from tests performed under
ambient temperature and V
DD
supply voltage conditions summarized in Table 14.
High-speed internal (HSI) RC oscillator
Table 39. HSI oscillator characteristics
(1)
1. V
DD
= 3.3 V, T
A
= –40 to 125 °C unless otherwise specified.
Symbol Parameter Conditions Min Typ Max Unit
f
HSI
Frequency - - 16 - MHz
ACC
HSI
HSI user trimming step
(2)
2. Guaranteed by design.
---1%
Accuracy of the HSI
oscillator
Used-trimmed with the RCC_CR
register
(2)
--1%
Factory
Calibrated
T
A
= - 40 to 125 °C
(3)
3. Guaranteed by characterization.
-8 - 5.5 %
T
A
= - 40 to 105 °C
(3)
-8 - 4.5 %
T
A
= - 10 to 85 °C
(3)
-4 - 4 %
T
A
= 25 °C
(4)
4. Factory calibrated, parts not soldered.
-1 - 1 %
t
su(HSI)
(2)
HSI oscillator startup time - - 2.2 4 µs
I
DD(HSI)
(2)
HSI oscillator power
consumption
- - 60 80 µA
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