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FRAM example PCB layouts
FRAM mini-shield slim
FRAM mini-shield test pins
LICENSE.txt
README.md

README.md

Hackscribble FRAM Hardware

PCB designs for connecting Fujitsu MB85RS Ferroelectric memory (FRAM) to Arduino and LPCXpresso boards.

Created on 20 April 2014 by Ray Benitez
Last modified on 1 December 2014 by Ray Benitez

These hardware designs are licensed by Ray Benitez under the Creative Commons Attribution-Sharealike 4.0 International License.

git@hackscribble.com | http://www.hackscribble.com | http://www.twitter.com/hackscribble

About the hardware

Level converter circuits

These circuit snippets connect 3.3V MB85RS FRAM chips to 5V Arduino inputs / outputs.

Two design approaches are shown:

  1. Discrete design using BSS108 FETs, following the approach used by the Adafruit level converter.

  2. Integrated design using TXB0104 to reduce PCB space required.

The designs are in Eagle format.

Mini-shield

The mini-shield allows up to three 3.3V FRAMS to be connected to an Arduino (or an LPCXPresso board). It uses an extended version of the integrated circuit snippet (above) using a TXB0108. The board has been tested with Arduino Uno and LPCXpresso 11U68 boards.

The design is in KiCad format.

The supply voltage for the Arduino / LPCXpresso side of the level converter is taken from the IOREF output of the Arduino / LPCXpresso. This automatically adjusts for 3.3V or 5V boards.

The REVISION B board also includes test points for monitoring the SPI bus.


Change history

1 December 2014

Added mini-shield REVISION C "slim" version.

5 November 2014

Upgraded mini-shield to REVISION B.

1 November 2014

Added mini-shield REVISION A.

20 April 2014

Initial release of level converter circuits REVISION A.