Datasheet

Electrical characteristics STM32F051x
62/105 Doc ID 022265 Rev 3
Figure 15. 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.
6.3.7 Internal clock source characteristics
The parameters given in Ta ble 3 8 are derived from tests performed under ambient
temperature and supply voltage conditions summarized in Table 2 0 .
High-speed internal (HSI) RC oscillator
-3
/3#?/54
/3#?).
F
,3%
#
,
K(Z
RESONATOR
#
,
2ESONATORWITH
INTEGRATEDCAPACITORS
$RIVE
PROGRAMMABLE
AMPLIFIER
Table 38. 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, not tested in production.
%
DuCy
(HSI)
Duty cycle 45
(2)
-55
(2)
%
ACC
HSI
Accuracy of the HSI
oscillator (factory
calibrated)
T
A
= –40 to 105 °C –3.8
(3)
3. Data based on characterization results, not tested in production.
-4.6
(3)
%
T
A
= –10 to 85 °C –2.9
(3)
-2.9
(3)
%
T
A
= 0 to 70 °C –1.3
(3)
-2.2
(3)
%
T
A
= 25 °C –1 - 1 %
t
su(HSI)
HSI oscillator startup
time
1
(2)
-2
(2)
µs
I
DD(HSI)
HSI oscillator power
consumption
- 80 100
(2)
µA