Internal Clock Source Characteristics; Table 30. Hsi Oscillator Characteristics; Table 31. Lsi Oscillator Characteristics - STMicroelectronics STM32L151CB Manual

STM32L151x6/8/B, STM32L152x6/8/B
6.3.7

Internal clock source characteristics

The parameters given in the following table are derived from tests performed under ambient
temperature and V
High-speed internal (HSI) RC oscillator
Symbol
f
HSI
(1)(2)
TRIM
(2)
ACC
HSI
(2)
t
SU(HSI)
(2)
I
DD(HSI)
1. The trimming step differs depending on the trimming code. It is usually negative on the codes which are
multiples of 16 (0x00, 0x10, 0x20, 0x30...0xE0).
2. Based on characterization, not tested in production.
3. Tested in production.
Low-speed internal (LSI) RC oscillator
Symbol
(1)
f
LSI
(2)
D
LSI
(3)
t
su(LSI)
(3)
I
DD(LSI)
1. Tested in production.
2. This is a deviation for an individual part, once the initial frequency has been measured.
3. Guaranteed by design, not tested in production.
supply voltage conditions summarized in
DD

Table 30. HSI oscillator characteristics

Parameter
Frequency V
DD
Trimming code is not a multiple of 16
HSI user-trimmed
resolution
Trimming code is a multiple of 16
V
DDA
V
DDA
V
DDA
Accuracy of the
factory-calibrated
V
DDA
HSI oscillator
V
DDA
V
DDA
T
A
HSI oscillator
startup time
HSI oscillator
power consumption

Table 31. LSI oscillator characteristics

Parameter
LSI frequency
LSI oscillator frequency drift
0°C ≤ T ≤ 85°C
A
LSI oscillator startup time
LSI oscillator power consumption
DocID17659 Rev 10
Conditions
= 3.0 V
= 3.0 V, T = 25 °C
A
= 3.0 V, T = 0 to 55 °C
A
= 3.0 V, T = -10 to 70 °C
A
= 3.0 V, T = -10 to 85 °C
A
= 3.0 V, T = -10 to 105 °C
A
= 1.65 V to 3.6 V
= -40 to 105 °C
-
-
Min
26
-10
-
-
Electrical characteristics
Table 13.
Min Typ Max
- 16 -
± 0.4
- 0.7
± 1.5
- -
(3) (3)
-1 - 1
-1.5 - 1.5
-2 - 2
-2.5 - 2
-4 - 2
-4 - 3
- 3.7 6
- 100 140
Typ Max Unit
38 56
- 4
- 200
400 510
Unit
MHz
%
%
%
%
%
%
%
%
µs
µA
kHz
%
µs
nA
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