STM32F051R4T6TR STMicroelectronics, STM32F051R4T6TR Datasheet - Page 58

• Manufacturer Part Number: STM32F051R4T6TR
• Description: ARM Microcontrollers - MCU ARM Cortex M0 16kB 48 MHz CPU 8kB Flash
• Manufacturer: STMicroelectronics

Specifications of STM32F051R4T6TR

• Rohs: yes

STM32F051x
Note:
High-speed external clock generated from a crystal/ceramic resonator
The high-speed external (HSE) clock can be supplied with a 4 to 32 MHz crystal/ceramic
resonator oscillator. All the information given in this paragraph are based on design
simulation results obtained with typical external components specified in
application, the resonator and the load capacitors have to be placed as close as possible to
the oscillator pins in order to minimize output distortion and startup stabilization time. Refer
to the crystal resonator manufacturer for more details on the resonator characteristics
(frequency, package, accuracy).
Table 36.
1. Resonator characteristics given by the crystal/ceramic resonator manufacturer.
2. Guaranteed by design, not tested in production.
3. This consumption level occurs during the first 2/3 of the
4. t
For C
5 pF to 20 pF range (typ.), designed for high-frequency applications, and selected to match
the requirements of the crystal or resonator (see
same size. The crystal manufacturer typically specifies a load capacitance which is the
series combination of C
can be used as a rough estimate of the combined pin and board capacitance) when sizing
C
For information on electing the crystal, refer to the application note AN2867 “Oscillator
design guide for ST microcontrollers” available from the ST website www.st.com.
t
SU(HSE)
Symbol
L1
f
OSC_IN
oscillation is reached. This value is measured for a standard crystal resonator and it can vary significantly
with the crystal manufacturer
SU(HSE)
I
R
g
and C
DD
m
F
L1
(4)
and C
is the startup time measured from the moment it is enabled (by software) to a stabilized 8 MHz
L2
Oscillator frequency
Feedback resistor
HSE current consumption
Oscillator transconductance
Startup time
.
HSE oscillator characteristics
L2
, it is recommended to use high-quality external ceramic capacitors in the
Parameter
L1
and C
Doc ID 022265 Rev 3
L2
. PCB and MCU pin capacitance must be included (10 pF
V
V
V
V
V
CL=10 pF@32 MHz
CL=20 pF@32 MHz
DD
CL=10 pF@8 MHz
DD
CL=10 pF@8 MHz
DD
CL=5 pF@32 MHz
DD
DD
During startup
V
Conditions
=3.3 V, Rm= 30Ω,
=3.3 V, Rm= 45Ω,
=3.3 V, Rm= 30Ω,
=3.3 V, Rm= 30Ω,
=3.3 V, Rm= 30Ω,
DD
t
Startup
SU(HSE)
is stabilized
Figure
startup time
(1)
14). C
(3)
L1
Min
Electrical characteristics
and C
10
4
-
-
-
-
-
-
-
-
(2)
L2
Typ
200
0.4
0.5
0.8
1.5
Table
8
1
2
-
are usually the
Max
36. In the
8.5
32
-
-
-
-
-
-
-
-
(2)
59/105
mA/V
MHz
Unit
mA
kΩ
ms