STM32F103VF STMicroelectronics, STM32F103VF Datasheet - Page 57

• Manufacturer Part Number: STM32F103VF
• Description: Mainstream Performance line, ARM Cortex-M3 MCU with 768 Kbytes Flash, 72MHz CPU, motor control, USB and CAN
• Manufacturer: STMicroelectronics

Specifications of STM32F103VF

• Conversion Range: 0 to 3.6 V
• Supported Peripherals: timers, ADCs, DAC, SDIO, I2Ss, SPIs, I2Cs and USARTs
• Systick Timer: a 24-bit downcounter

STM32F103xF, STM32F103xG
Table 24.
1. Based on characterization, not tested in production.
2. Refer to the note and caution paragraphs below the table, and to the application note AN2867 “Oscillator design guide for
3.
Note:
Caution:
t
SU(LSE)
Symbol
ST microcontrollers”.
reached. This value is measured for a standard crystal and it can vary significantly with the crystal manufacturer, PCB
layout and humidity
C
t
R
g
SU(LSE)
I
(2)
2
m
F
(3)
is the startup time measured from the moment it is enabled (by software) until a stabilized 32.768 kHz oscillation is
Feedback resistor
Recommended load capacitance
versus equivalent serial
resistance of the crystal (R
LSE driving current
Oscillator transconductance
Startup time
Low-speed external clock generated from a crystal/ceramic resonator
The low-speed external (LSE) clock can be supplied with a 32.768 kHz crystal/ceramic
resonator oscillator. All the information given in this paragraph are based on characterization
results obtained with typical external components specified in
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).
LSE oscillator characteristics (f
For C
15 pF range selected to match the requirements of the crystal or resonator (see
C
capacitance which is the series combination of C
Load capacitance C
C
between 2 pF and 7 pF.
To avoid exceeding the maximum value of C
to use a resonator with a load capacitance C
capacitance of 12.5 pF.
Example: if you choose a resonator with a load capacitance of C
then C
L1
stray
and C
L1
is the pin capacitance and board or trace PCB-related capacitance. Typically, it is
L1
and C
Parameter
= C
L2,
L2
are usually the same size. The crystal manufacturer typically specifies a load
L2
= 8 pF.
, it is recommended to use high-quality ceramic capacitors in the 5 pF to
L
has the following formula: C
S
)
Doc ID 16554 Rev 3
stabilized
V
LSE
DD
V
is
= 32.768 kHz)
DD
= 3.3 V, V
Conditions
R
S
L1
= 30 kΩ
L
≤ 7 pF. Never use a resonator with a load
and C
T
T
T
T
T
T
T
L1
T
A
A
A
A
IN
L
A
A
A
A
= -10 °C
= -20 °C
= -30 °C
= -40 °C
= C
= 50 °C
= 25 °C
= 10 °C
= V
and C
= 0 °C
(1)(2)
L2
SS
L1
(15 pF) it is strongly recommended
x C
L2
.
L2
Table
/ (C
Electrical characteristics
L
Min
= 6 pF, and C
5
L1
-
-
-
-
-
-
-
-
-
-
-
24. In the application,
+ C
Typ
1.5
2.5
10
17
32
60
L2
5
4
6
-
-
-
) + C
Max
1.4
stray
15
Figure
stray
-
-
-
-
-
-
-
-
-
-
= 2 pF,
where
57/120
µA/V
Unit
MΩ
pF
µA
21).
s