Datasheet

DS12556 Rev 2 113/201
STM32H750VB STM32H750IB STM32H750XB Electrical characteristics
189
64 MHz high-speed internal RC oscillator (HSI)
4 MHz low-power internal RC oscillator (CSI)
5. Jitter measurements are performed without clock source activated in parallel.
Table 45. HSI oscillator characteristics
(1)
Symbol Parameter Conditions Min Typ Max Unit
f
HSI
HSI frequency V
DD
=3.3 V, T
J
=30 °C 63.7
(2)
64 64.3
(2)
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
(3)
-1
(3)
%
T
J
=40 to T
J
max °C 2
(3)
-1
(3)
t
su
(HSI) HSI oscillator start-up time - - 1.4 2 µs
t
stab
(HSI) HSI oscillator stabilization time at 1% of target frequency - - 4 µs
I
DD
(HSI) HSI oscillator power consumption - - 300 400 µA
1. Guaranteed by design unless otherwise specified.
2. Guaranteed by test in production.
3. Guaranteed by characterization.
Table 46. 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 %

TEMP
(CSI)
CSI oscillator frequency drift over
temperature
T
J
= 0 to 85 °C - 3.7
(3)
4.5
(3)
%
T
J
= 40 to 125 °C - 11
(3)
7.5
(3)
D
VDD
(CSI)
CSI oscillator frequency drift over
V
DD
V
DD
= 1.62 to 3.6 V - 0.06 0.06 %
t
su(CSI)
CSI oscillator startup time - - 1 2 µs
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