Datasheet

Electrical characteristics STM32L431xx
118/200 DocID028800 Rev 1
High-speed internal 48 MHz (HSI48) RC oscillator
Table 49. HSI48 oscillator characteristics
(1)
Symbol Parameter Conditions Min Typ Max Unit
f
HSI48
HSI48 Frequency V
DD
=3.0V, T
A
=30°C - 48 - MHz
TRIM HSI48 user trimming step - - 0.11
(2)
0.18
(2)
%
USER TRIM
COVERAGE
HSI48 user trimming coverage ±32 steps ±3
(3)
±3.5
(3)
-%
DuCy(HSI48) Duty Cycle - 45
(2)
-55
(2)
%
ACC
HSI48_REL
Accuracy of the HSI48 oscillator
over temperature (factory
calibrated)
V
DD
= 3.0 V to 3.6 V,
T
A
= –15 to 85 °C
--±3
(3)
%
V
DD
= 1.65 V to 3.6 V,
T
A
= –40 to 125 °C
--±4.5
(3)
D
VDD
(HSI48)
HSI48 oscillator frequency drift
with V
DD
V
DD
= 3 V to 3.6 V - 0.025
(3)
0.05
(3)
%
V
DD
= 1.65 V to 3.6 V - 0.05
(3)
0.1
(3)
t
su
(HSI48) HSI48 oscillator start-up time - - 2.5
(2)
6
(2)
s
I
DD
(HSI48)
HSI48 oscillator power
consumption
--340
(2)
380
(2)
A
N
T
jitter
Next transition jitter
Accumulated jitter on 28 cycles
(4)
--+/-0.15
(2)
-ns
P
T
jitter
Paired transition jitter
Accumulated jitter on 56 cycles
(4)
--+/-0.25
(2)
-ns
1. V
DD
= 3 V, T
A
= –40 to 125°C unless otherwise specified.
2. Guaranteed by design.
3. Guaranteed by characterization results.
4. Jitter measurement are performed without clock source activated in parallel.
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