Datasheet

DocID030538 Rev 3 121/226
STM32H743xI Electrical characteristics
196
64 MHz high-speed internal RC oscillator (HSI)
4 MHz low-power internal RC oscillator (CSI)
Table 46. HSI oscillator characteristics
(1)
Symbol Parameter Conditions Min Typ Max Unit
f
HSI
HSI frequency V
DD
=3.3 V, T
J
=30 °C - 64 - MHz
TRIM HSI user trimming step
Trimming is not a multiple
of 32
- 0.24 0.32
%
Trimming is 128, 256 and
384
5.2 1.8 -
Trimming is 64, 192, 320
and 448
1.4 0.8 -
Other trimming are a
multiple of 32 (not
including multiple of 64
and 128)
0.6 0.25 -
DuCy(HSI) Duty Cycle - 45 - 55 %
Δ
VDD (HSI)
HSI oscillator frequency drift over
V
DD
(reference is 3.3 V)
V
DD
=1.62 to 3.6 V 0.12 - 0.03 %
Δ
TEMP (HSI)
HSI oscillator frequency drift over
temperature (reference is 64 MHz)
T
J
=-20 to 105 °C 1
(2)
-1
(2)
%
T
J
=40 to T
J
max °C 2
(2)
1
(2)
t
su
(HSI) HSI oscillator start-up time - - 1.4 2 µs
t
stab
(HSI) HSI oscillator stabilization time at 1% of target frequency - 3 5 µs
I
DD
(HSI) HSI oscillator power consumption - - 300 400 µA
1. Guaranteed by design unless otherwise specified.
2. Guaranteed by characterization.
Table 47. CSI oscillator characteristics
(1)
Symbol Parameter Conditions Min Typ Max Unit
f
CSI
CSI frequency V
DD
=3.3 V, T
J
=30 °C 3.96
(2)
44.04
(2)
MHz
TRIM Trimming step - - 0.35 - %
DuCy(CSI) Duty Cycle - 45 - 55 %

VDD
(CSI) +

TEMP
(CSI)
CSI oscillator frequency drift over
V
DD
& drift over temperature
V
DD
=1.62 to 3.6 V
T
J
= 0 to 85 °C
- ±1
(3)
-%
t
su(CSI)
CSI oscillator startup time - - 1 - µs
t
stab(CSI)
CSI oscillator stabilization time
(to reach ±
3% of f
CSI
)
- - - 4 cycle
I
DD(CSI)
CSI oscillator power consumption - - 23 30 µA
1. Guaranteed by design.
2. Guaranteed by test in production.
3. Guaranteed by characterization results.
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