NetduinoPlus2 Netduino, NetduinoPlus2 Datasheet - Page 98

• Manufacturer Part Number: NetduinoPlus2
• Description: Development Boards & Kits - ARM NETDUINO PLUS 2
• Manufacturer: Netduino

Specifications of NetduinoPlus2

• Rohs: yes
• Product: Development Boards
• Tool Is For Evaluation Of: STM32F405RG
• Core: ARM Cortex M4
• Interface Type: I2C, SPI, UART, USB
• Operating Supply Voltage: 7.5 v to 9 V
• Data Bus Width: 32 bit
• Description/function: Arduino form factor
• Dimensions: 2.8 in x 2.1 in
• Maximum Operating Temperature: + 70 C
• Minimum Operating Temperature: 0 C

Electrical characteristics
5.3.11
Table 36.
1. Guaranteed by design, not tested in production.
98/180
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:
f
As an example:
If f
equation 1:
Equation 2
Equation 2 allows to calculate the increment step (INCSTEP):
f
With a modulation depth (md) = ±2 % (4 % peak to peak), and PLLN = 240 (in MHz):
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:
As a result:
PLL_IN
VCO_OUT
PLL_IN
INCSTEP
and f
= 1 MHz, and f
must be expressed in MHz.
md
md
Mod
INCSTEP
quantized
quantized
must be expressed in Hz.
=
Table 42: EMI
round
%
%
MOD
=
[
(
Peak modulation depth
MODEPER
=
(
=
Modulation frequency
round
2
MODEPER
15
(
(
= 1 kHz, the modulation depth (MODEPER) is given by
250 126
MODEPER
Doc ID 022152 Rev 3
–
Parameter
[
1
(
×
)
(
characteristics). It is available only on the main PLL.
2
×
15
2
–
×
=
×
=
1
240
round 10
100
) md
×
round f
×
INCSTEP
)
×
⁄
(
[
5
100
[
×
)
PLL_IN
⁄
PLLN
6
(
×
(
⁄
2
(
5
4 10
15
×
×
×
100
)
–
⁄
250
⁄
(
1
(
4
100 5
)
3
×
×
)
×
)
]
]
0.25
f
5
Min
240
Mod
=
STM32F405xx, STM32F407xx
=
)
×
-
-
⁄
(
250
126md(quantitazed)%
)
)
(
×
]
2
=
15
MODEPER
2.002%(peak)
–
Typ
1
-
-
-
) PLLN
×
Max
2
)
15
10
]
2
−1
)
(1)
Unit
KHz
%
-