STM32F407IGT6 STMicroelectronics, STM32F407IGT6 Datasheet - Page 81

• Manufacturer Part Number: STM32F407IGT6
• Description: IC MCU 32BIT 1MB FLASH 176LQFP
• Manufacturer: STMicroelectronics

Specifications of STM32F407IGT6

• Core Processor: ARM Cortex-M4
• Core Size: 32-Bit
• Speed: 168MHz
• Connectivity: CAN, I²C, IrDA, LIN, SPI, UART/USART, USB OTG
• Peripherals: Brown-out Detect/Reset, DMA, I²S, POR, PWM, WDT
• Number Of I /o: 140
• Program Memory Size: 1MB (1M x 8)
• Program Memory Type: FLASH
• Eeprom Size: -
• Ram Size: 192K x 8
• Voltage - Supply (vcc/vdd): 1.8 V ~ 3.6 V
• Data Converters: A/D 24x12b; D/A 2x12b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: *
• Core: ARM Cortex M4
• Processor Series: STM32F4
• Data Bus Width: 32 bit
• Maximum Clock Frequency: 168 MHz
• Data Ram Size: 192 KB
• On-chip Adc: Yes
• Number Of Programmable I/os: 140
• Number Of Timers: 10
• Operating Supply Voltage: 1.7 V to 3.6 V
• Mounting Style: SMD/SMT
• A/d Bit Size: 12 bit
• A/d Channels Available: 24
• Interface Type: CAN, I2C, I2S, SPI, UART
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 497-11604

STM32F405xx, STM32F407xx
5.3.11
Table 33.
1. Guaranteed by design, not tested in production.
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 f
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:
The error in modulation depth is consequently: 2.0 - 1.99954 = 0.00046%.
PLL_IN
VCO_OUT
PLL_IN
INCSTEP
and f
= 1 MHz, and f
must be expressed in MHz.
md
md
INCSTEP
Mod
quantized
quantized
must be expressed in Hz.
=
Table 39: EMI
round
%
%
=
MOD
=
[
round
=
(
Peak modulation depth
(
Modulation frequency
MODEPER
(
2
MODEPER
(
MODEPER INCSTEP
25
15
= 1 kHz, the modulation depth (MODEPER) is given by
Doc ID 022152 Rev 1
[
–
×
Parameter
(
(
1
1258
2
)
characteristics). It is available only on the main PLL.
15
×
–
2
×
1
×
=
) md
×
100
=
240
×
round 10
round f
×
)
⁄
5
(
×
100
)
[
[
f
⁄
VCO_OUT
(
PLL_IN
(
6
2
×
⁄
×
15
(
5
4
100
×
–
×
⁄
1
25
(
10
)
) 240
4
×
⁄
×
)
3
(
×
]
5
100 5
)
)
0.25
f
=
Min
]
Mod
⁄
-
-
(
=
1258md(quantitazed)%
(
)
×
2
25
)
VCO_OUT
=
15
]
Electrical characteristics
×
1.99954%(peak)
–
MODEPER
1
Typ
) f
-
-
-
×
VCO_OUT
= 240 (in MHz):
Max
2
15
10
2
)
−1
]
(1)
)
Unit
KHz
81/154
%
-