STM3220G-SK/IAR STMicroelectronics, STM3220G-SK/IAR Datasheet - Page 84
![no-image](/images/manufacturer_photos/0/6/637/stmicroelectronics_sml.jpg)
STM3220G-SK/IAR
Manufacturer Part Number
STM3220G-SK/IAR
Description
DEV KIT STM32F207ZG KICKSTART
Manufacturer
STMicroelectronics
Series
IAR Kickstartr
Type
MCUr
Specifications of STM3220G-SK/IAR
Contents
Hardware, Software and Documentation
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
For Use With/related Products
STM32F207
Other names
497-11404
- Current page: 84 of 163
- Download datasheet (3Mb)
Electrical characteristics
5.3.11
Table 31.
1. Guaranteed by design, not tested in production.
84/163
MODEPER * INCSTEP
Symbol
f
md
Mod
PLL spread spectrum clock generation (SSCG) characteristics
The spread spectrum clock generation (SSCG) feature allows to reduce electromagnetic
interferences (see
SSCG parameters constraint
Equation 1
The frequency modulation period (MODEPER) is given by the equation below:
Equation 2
Equation 2 allows to calculate the increment step (INCSTEP):
An amplitude quantization error may be generated because the linear modulation profile is
obtained by taking the quantized values (rounded to the nearest integer) of MODPER and
INCSTEP. As a result, the achieved modulation depth is quantized. The percentage
quantized modulation depth is given by the following formula:
Figure 34
down spread modes, where:
F0 is f
T
md is the modulation depth.
mode
md
and
PLL_OUT
is the modulation period.
INCSTEP
quantized
Figure 35
Table 37: EMI
nominal.
%
=
=
round
show the main PLL output clock waveforms in center spread and
Peak modulation depth
Modulation frequency
(
MODEPER
MODEPER INCSTEP
[
Doc ID 15818 Rev 6
Parameter
(
(
2
characteristics). It is available only on the main PLL.
15
–
1
) md
×
=
×
round f
×
[
f
VCO_OUT
PLL_IN
×
100
⁄
(
)
4
×
⁄
(
×
5
100 5
)
f
Min
0.5
Mod
⁄
STM32F205xx, STM32F207xx
-
-
(
(
×
2
)
15
]
×
–
MODEPER
1
Typ
) f
-
-
-
×
VCO_OUT
Max
2
15
10
2
)
−1
]
(1)
)
Unit
KHz
dec
dec
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