STM32F107VCT6TR STMicroelectronics, STM32F107VCT6TR Datasheet - Page 48

• Manufacturer Part Number: STM32F107VCT6TR
• Description: ARM Microcontrollers - MCU STM32F105 Conn Line M3 256kB 72 MHz MCU
• Manufacturer: STMicroelectronics

Specifications of STM32F107VCT6TR

• Product Category: ARM Microcontrollers - MCU
• Core: ARM Cortex M3
• Data Bus Width: 32 bit

Electrical characteristics
Table 23.
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 ST
3. The oscillator selection can be optimized in terms of supply current using an high quality resonator with small R
4.
Note:
Caution:
48/104
t
SU(LSE)
Symbol
microcontrollers”.
MSIV-TIN32.768kHz. Refer to crystal manufacturer for more details
This value is measured for a standard crystal and it can vary significantly with the crystal manufacturer
C
t
R
g
SU(LSE)
I
(2)
2
m
F
(4)
is the startup time measured from the moment it is enabled (by software) to a stabilized 32.768 kHz oscillation is reached.
Feedback resistor
Recommended load capacitance
versus equivalent serial
resistance of the crystal (R
LSE driving current
Oscillator Transconductance
Startup time
resonator manufacturer for more details on the resonator characteristics (frequency,
package, accuracy).
LSE oscillator characteristics (f
For C
5 pF to 15 pF range selected to match the requirements of the crystal or resonator (see
Figure
specifies a load 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
stray
L1
is the pin capacitance and board or trace PCB-related capacitance. Typically, it is
L1
17). C
Parameter
and C
= C
L2
L1
L2
= 8 pF.
and C
it is recommended to use high-quality external ceramic capacitors in the
L
has the following formula: C
L2,
S
)
(3)
are usually the same size. The crystal manufacturer typically
Doc ID 15274 Rev 6
V
DD
LSE
Conditions
is stabilized
= 32.768 kHz)
V
DD
= 3.3 V, V
L1
L
R
≤
S
and C
= 30 kΩ
7 pF. Never use a resonator with a load
L
= C
(1)
L2
IN
L1
= V
(15 pF) it is strongly recommended
T
T
T
T
T
T
T
T
A
A
A
A
A
A
A
x C
A
SS
= -10 °C
= -20 °C
= -30 °C
= -40 °C
= 50 °C
= 25 °C
= 10 °C
= 0 °C
STM32F105xx, STM32F107xx
L2
/ (C
L
L1
= 6 pF, and C
L1
and C
+ C
L2
Min
L2
5
) + C
.
S
stray
stray
Typ
value for example
1.5
2.5
10
17
32
60
5
4
6
= 2 pF,
where
Max
1.4
15
µA/V
Unit
MΩ
pF
µA
s