Datasheet

DS9178 Rev 4 63/96
STM8L051F3 Electrical parameters
87
Internal clock sources
Subject to general operating conditions for V
DD
, and T
A
.
High speed internal RC oscillator (HSI)
In the following table, data is based on characterization results, not tested in production,
unless otherwise specified.
Figure 14. Typical HSI frequency vs V
DD
Table 30. HSI oscillator characteristics
Symbol Parameter
Conditions
(1)
Min Typ Max Unit
f
HSI
Frequency V
DD
= 3.0 V - 16 - MHz
ACC
HSI
Accuracy of HSI
oscillator (factory
calibrated)
V
DD
= 3.0 V, T
A
= 25 °C
-1
(2)
-2.5
-
1
(2)
%
1.8 V ≤ V
DD
≤ 3.6 V,
-40 °C ≤ T
A
≤ 85 °C
-5 - 5 %
TRIM
HSI user trimming
step
(3)
Trimming code ≠ multiple of 16 - 0.4 0.7 %
Trimming code = multiple of 16 - - ± 1.5 %
t
su(HSI)
HSI oscillator setup
time (wakeup time)
--3.76
(4)
µs
I
DD(HSI)
HSI oscillator power
consumption
- - 100 140
(4)
µA
1. V
DD
= 3.0 V, T
A
= -40 to 85 °C unless otherwise specified.
2. Tested in production.
3. 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). Refer to the AN3101 “STM8L15x internal RC oscillator calibration” application note for
more details.
4. Guaranteed by design.
13.0
13.5
14.0
14.5
15.0
15.5
16.0
16.5
17.0
17.5
18.0
-40°C
25°C
85°C
V
DD [V]
HSI frequency [MHz]
1.8 1.95 2.1 2.25 2.4 2.55 2.7 2.85 3 3.15 3.3 3.45 3.6
ai18218c
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