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STM32F427AI Datenblatt(PDF) 92 Page - STMicroelectronics

Teilenummer STM32F427AI
Bauteilbeschribung  32b Arm® Cortex®-M4 MCUFPU, 225DMIPS, up to 2MB Flash/2564KB RAM, USB OTG HS/FS, Ethernet, 17 TIMs, 3 ADCs, 20 com. interfaces, camera & LCD-TFT
PDF  240 Pages
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Hersteller  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
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STM32F427AI Datenblatt(HTML) 92 Page - STMicroelectronics

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Electrical characteristics
STM32F427xx STM32F429xx
92/240
DS9405 Rev 12
6.1.6
Power supply scheme
Figure 22. Power supply scheme
1. To connect BYPASS_REG and PDR_ON pins, refer to Section 3.17: Power supply supervisor and Section 3.18: Voltage
regulator
2. The two 2.2 µF ceramic capacitors should be replaced by two 100 nF decoupling capacitors when the voltage regulator is
OFF.
3. The 4.7 µF ceramic capacitor must be connected to one of the VDD pins.
4. VDDA=VDD and VSSA=VSS.
Caution:
Each power supply pair (VDD/VSS, VDDA/VSSA ...) must be decoupled with filtering ceramic
capacitors as shown above. These capacitors must be placed as close as possible to, or
below, the appropriate pins on the underside of the PCB to ensure good operation of the
device. It is not recommended to remove filtering capacitors to reduce PCB size or cost.
This might cause incorrect operation of the device.
MS19911V3
Backup circuitry
(OSC32K,RTC,
Wakeup logic
Backup registers,
backup RAM)
Kernel logic
(CPU, digital
& RAM)
Analog:
RCs,
PLL,..
Power
switch
VBAT
GPIOs
OUT
IN
15 × 100 nF
+ 1 × 4.7 μF
VBAT =
1.65 to 3.6V
Voltage
regulator
VDDA
ADC
IO
Logic
VDD
100 nF
+ 1 μF
Flash memory
VCAP_1
VCAP_2
2 × 2.2 μF
BYPASS_REG
PDR_ON
Reset
controller
VDD
1/2/...14/15
VSS
1/2/...14/15
VDD
VREF+
VREF-
VSSA
VREF
100 nF
+ 1 μF



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