Description of peripherals

Detailed description of peripherals and connectors located on Microstick Plus USB panel

Documentation
  • USB Mini B connector
    • Use for device communication.
    • Powering of the microcontroller USB periphery resolved via this connector.
    • The configuration switches must be at D - D position.
  • USB Host A connector
    • Use for Host communication.
    • The power supply of this connector provided by the USB Mini B connector.
    • The output corrent protected by over current protection. (MIC2005A-1YM5)
    • The configuration switches must be at H - D position.
  • USB Micro AB connector
    • Use for device or On-The-Go (OTG) communication.
    • In case of Device communication mode, the microcontroller’s USB periphery powered via this connector.
    • In case of Device communication mode, the configuration switches must be at H - D position.
    • In case of OTG communication mode, the needed power supply of this connector is provided by the USB Mini B connector.
    • In case of OTG communication mode, the configuration switches must be at H - O position.
  • 1 user push button
    • The push button connected to the RB7 pin of the microcontroller.
    • Output value:
      • Low - The push button is pressed
      • High - The push button is not pressed 
  • 2 user LED
    • The user LEDs are connected to the RB8 and RB9 pin of the microcontroller.
    • The LEDs are lighting at logic high level.
    • Red LED is connected to the RB8 pin, green LED is connected to the RB9 pin.
  • 2  configuration switches
    • By using the switches, the following modes can be set:
       State of Switches  Communication Mode  Connector
       D - D  Device  Mini - B
       H - D  Host  Host - A
       H - O  Host + PWR  Host - A
       H - O  OTG  Micro - AB
       D - O  Do not use!  ---------------
  • 8 MHz quartz crystal
    • Clock source of the microcontroller and the USB periphery. The quartz is connected to the primary oscillator pin of the microcontroller. (OSC1 and OSC2)
  • 3,3V voltage regulating circuit
    • Provides the power supply needed by microcontroller’s USB periphery.
  • Over current protection circuit (MIC2005A-1YM5)
    • If the device on the USB Host (USB-A) or USB OTG (Micro AB) connectors drains more than 500 mA, then the protection circuit limits the output current by decreasing the output voltage.
    • In case of over current, the red colored OVC LED lights and the microcontroller’s RB7 pin pulled to logical low.
    • If the SW2 switch ( H - D ) is at H state is a possible to control the output voltage of USB-Host (USB-A) or USB OTG (Micro AB) connector ( to turn on or turn off the output voltage ).
    • Logic high of VBUSON/RB14 pin enables, logic low disables the output voltage. The output voltage is indicated by PWR (green) LED.
    • Warning: Continuous over current can be destroy the over current protection IC!

Linking the Microstick Plus Rev. C and the Microstick Plus USB power supply

The Microstick Plus USB package contains 10 cm long cable to connect the 5V supply pin of Microstick Plus Rev. C and the Microstick Plus USB peripheral panel together.
In connected state the powering of both panels is realized through USB Mini B connector of Microstick Plus USB panel. 

The process of linking the power supplies:
  1. Connect the cable to the 5V supply pin of 14 pin header on Microstick Plus Rev. C panel. (Lower left pin of the 14 pin header looking from the front.)
  2. Connect the other side of the cable to the 5V supply pin of 4 pin header on Microstick USB panel. (Lower left pin of the 14 pin header looking from the front.)
  3. Power the connected panels through USB Micro-B connector on Microstick Plus USB panel.
To access the additional documentation, click the following links: