User manual
Page 24
Page 25
STM32F207VGT6 and STM32F407VGT6
microcontrollers are equipped with internal
16MHz RC oscillator that provides stable clock
signal. Since the chips have an integrated PLL, this
base frequency is suitable for further clock multiplication.
Board also contains 32.768kHz Crystal oscillator (X1)
which provides external clock for internal RTCC module.
5. Oscillators
Figure 5-1:
Crystal oscillator module (X1)
58
57
56
55
54
53
52
72
69
68
67
66
65
64
63
8
7
9
0
62
61
60
59
71
51
70
6
75
74
73
1
2
3
4
5
6
7
8
9
0
1
2
3
4
5
6
7
8
9
0
VCC-3.3
C2
22pF
C1
22pF
X1
32.768KHz
AVCC
30
29
28
27
34
33
46
36
35
42
43
44
45
37
50
9
48
49
11
12
3
2
4
3
7
7
24
23
18
17
16
15
14
13
5
6
7
8
10
7
8
1
2
22
21
20
19
38
39
40
4
1
47
31
26
25
7
8
8
8
8
8
8
8
8
8
9
9
9
9
9
9
9
9
9
9
10
PE11
PE10
PE6
VBAT
PC13/TAMPER_RTC
PC14/OSC32_IN
PA10
PA9
PA8
PD9
PE13
PE12
PB13
PB14
PB15
PD8
PE14
PE15
PB5
PB4
PB3
PB7
PD7
PD6
PE5
PE4
PE1
PE0
PB9
PB8
BOOT0
PB6
OSC_IN
PA0-WKUP
VDDA
VREF+
GNDA
VDD
PC3
PA12
PA11
PB12
PC8
NRST
VDD
GND
PE7
PDR_ON(RFU)
VDD
PE2
PE3
PA2
PA1
VCAP
VDD
PC9
PD13
PB10
PB11
PD10
PE8
PB2
PD11
PD14
PD5
PC2
PC1
PC0
PB1
PE9
PD12
PC7
OSC_OUT
PC15/OSC32_OUT
PD15
PC6
PA13
PC1 0
PA14
VCAP
GND
VDD
PA15
PC1 1
PC1 2
PD0
PA6
PA5
PC4
PA7
PC5
PB0
GND
VDD
PA3
PA4
PD1
PD2
PD3
PD4
U1
OSC32_IN
OSC32_OUT
VREF-1.8
R65
100K
C41 2.2uF
C42
2.2uF
R66 100K
decoupling
capacitors
C5
100nF
C6
100nF
C7
100nF
C8
100nF
E8
10uF
VCC-3.3 VCC-3.3 VCC-3.3 VCC-3.3VCC-3.3
C31
100nF
VCC-3.3
VCC-3.3
J3
J2
STM32F207VGT6
STM32F407VGT6
The use of crystal in all other schematics is implied even if it is
purposely left out, because of the schematics clarity.
NOTE:
Figure 5-2:
Crystal oscillator
schematics