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D2i
D+
D2i
D+
D-
D1i
D1i
D-
R1
Resistance
330 Ω
J1
Manufacturer Part Number
USB-A PCB Plug
VOUT
C1
Capacitance
1uF
VOUT
U4
Manufacturer Part Number
HMX3033HNA
C5
Capacitance
100nF
J2
VIN
VOUT
Y1
Manufacturer Part Number
CSTNE8M00G55A000R0
C6
Capacitance
100nF
C2
Capacitance
1uF
VIN
VOUT
C7
Capacitance
100nF
C4
Capacitance
100nF
C3
Capacitance
100nF
VOUT
U1
Manufacturer Part Number
ME6206A33XG
U2
Manufacturer Part Number
NUF2221W1T2G
U3
Manufacturer Part Number
STM32F103T8U6
LED1

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USB Security Token

USB Security Token thumbnail
This design implements a USB security token powered by an STM32 microcontroller. The device is engineered for compactness and efficient PCB integration while ensuring robust security features. Key elements of the design include:
  • Microcontroller Core: A STM32F103T8U6 serves as the primary processing unit, handling USB communication and security protocols.
  • USB Interface: A USB-A plug provides connectivity to the host. Dedicated net portals ensure proper routing of the VBUS, D+, D–, and ground signals.
  • Power Regulation: A low-dropout regulator supplies a stable 3.3V operating voltage, ensuring low noise and proper current supply to the microcontroller and peripherals.
  • Signal Conditioning and EMI Filtering: An EMI filter is used to maintain signal integrity and reduce interference while preserving the security token’s functionality.
  • Synchronous Elements: A ceramic resonator is incorporated to provide a precise clock source for USB data transfer and microcontroller operations.
  • Additional Components: Surface-mount resistors, capacitors, and LED indicators are deployed to ensure proper conditioning, decoupling, and status feedback. Their compact 0402 packages facilitate a highly integrated design.
  • Connectivity and Net Portals: Custom net portals are used throughout the schematic to streamline connectivity and PCB layout, keeping the design modular and easy to modify.
This USB security token is designed with industry-standard components and robust connectivity to ensure secure, reliable operation in portable security applications.
#USBToken #STM32 #PCBDesign #SecurityTechnology #PortableSecurity #Microcontrollers #USBInterface #PowerRegulation #EMIProtection #CompactDesign

Properties

Arrow

Pricing & Availability

Distributor

Qty 1

Arrow

$3.63–$3.85

Digi-Key

$6.40–$6.69

HQonline

$3.24

LCSC

$4.07

Mouser

$6.68

TME

$6.15

Verical

$5.24–$6.64

Controls