Posts tagged ‘jtag’

Modular LPC1700 prototyping board

This LPC1700 prototyping board is modular and simple to build as single-sided PCB. I made it with toner-transfer method. No drilling is required, just SMD soldering. Complete board is modular. Normally, not all periphery is used all the time. Depending on project, there are just too many possibilities, which can not be covered by a single prototyping board. This schematic is just one example how to use miniature prototyping modules, which are described in other posts. Such modules have one big dvantage: they can be simply recycled and used in many prototypes. This protoboard is populated with USB and JTAG modules as absolute minimum for start debugging. USB module provides 3,3V power supply from USB port and JTAG interface is for debugging.

Other modules provided on this board are:

  • ethernet PHY
  • Micro SD socket
  • Monochrome 128×64 graphical LCD
  • 16 bit ADC
  • 24 bit ADC
  • audio amplifier

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Universal JTAG adapter

Next simple board in “universal” series is JTAG adaptor. First was Universal USB adapter with power supply. Most commonly used JTAG connector is 20 pin IDC, found on many prototyping boards. It takes lot of board space and requires through hole drilling in PCB, which I usually avoid when building prototypes with single sided PCB, manufactured with toner transfer method.

This simple adapter has all neccessary pullups and pulldowns. Connector at one side is standard IDC20, at the other side are 9 pads in line with 2,54mm raster.

Files for JTAG adapter:

Soldered module:

JTAG interface

Jtag interface module