2 layers41 × 20.3 mm Eeprom, the printed circuit board in 3D

Eeprom

1Mbit I2C EEPROM PMOD

Size: 41 × 20.3 mm
Copper layers: 2
Thickness: 0.8 mm
Parts: 15
Nets: 15
Pads: 55
Tracks, vias: 117, 0
Pours: 1
Routed: Yes
KiCad: KiCad 7 (file 20221018)
Created: 5 Sep 2021
Updated: 5 Nov 2023

Overview

Eeprom is an open-source printed circuit board by fm4dd, from the fm4dd/pmod-eeprom repository on GitHub. It is a 2-layer board of 41 × 20.3 mm with 15 parts on 15 nets, routed with 117 tracks and 0 vias.

Its parts include 3 capacitors, 3 resistors, 2 connectors, 1 IC and 1 switch. It belongs with the fPGA and programmable logic boards and the FPGA and CPLD boards of this library.

README

readme.md

PMOD-EEPROM

Description

This I2C PMOD provides a 1 Mbit serial EEPROM, using the M24M01 circuit by STMicroelectronics. DIP switches enable I2C pull-up resistors if needed, and change the EEPROM's I2C device address. Up to four modules can be chained for a total capacity of 4 Mbit (512 KBytes). Three Testpoints can be fitted for I2C bus troubleshooting. The PMOD has designs for Type-6 (I2C single row), and for the new Type-6A (I2C extended double row). The picture shows the Type-6A variant (engineering sample).

http://fpga.fm4dd.com/

Schematic

This is the schema for the PMOD I2C Type-6 (single row) connector variant:

The current EEPROM desin is pulling the "write-protect" pin high for "read-write" operation. A design update may implement a solder pad for setting the EEPROM 'read-only' after programming.

Hardware Release

Type	Version	Gerber	Schema
Type-6	1.1	EEPROM PMOD Type-6 Gerber V1.1	20210917-eeprom-t6-schema-v11.pdf
Type-6A	1.1	EEPROM PMOD Type-6A Gerber V1.1	20210814-eeprom-t6a-schema-v11.pdff

Rasperry Pi I2C Discovery

Ensure the I2C bus is enabled, and install prerequisite I2C tools:

text

# sudo apt-get install git i2c-tools
# raspi-config  2 Interface Options  enable I2C

Check the IO expander circuit is visible on the I2C bus under address 0x50..0x56, depending on the address set through the DIP switch. Below example address 0x50/51 is set with SW1-1 = off and SW1-2 = off.

text

pi@pi-ms05:~ $ i2cdetect -y 1
     0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f
00:          -- -- -- -- -- -- -- -- -- -- -- -- --
10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
50: 50 51 -- -- -- -- -- -- -- -- -- -- -- -- -- --
60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
70: -- -- -- -- -- -- -- --

Example code

pmod-eeprom code examples for Arduino boards are available in the example folder

On the Raspberry Pi, the PMOD can be easily programmed with the eeprom utility program 'eepflash.sh'. This program writes a manually created byte file (.eep) as content into the I2C eeprom. It can be found as part of the Raspberry Pi foundation 'hats' repository:

text

pi@pi-ms05:~ $ git clone https://github.com/raspberrypi/hats.git
Cloning into 'hats'...
remote: Enumerating objects: 565, done.
remote: Counting objects: 100% (95/95), done.
remote: Compressing objects: 100% (61/61), done.
remote: Total 565 (delta 59), reused 46 (delta 34), pack-reused 470
Receiving objects: 100% (565/565), 306.34 KiB | 936.00 KiB/s, done.
Resolving deltas: 100% (325/325), done.

Compile the tools located in the eepromutils subdirectory:

text

pi@pi-ms05:~ $ cd hats/eepromutils/
pi@pi-ms05:~/hats/eepromutils $ make clean; make
rm -f eepmake eepdump
cc -Wall -Wextra eepmake.c -o eepmake
cc -Wall -Wextra eepdump.c -o eepdump

Check the tools:

text

pi@pi-ms05:~/hats/eepromutils $ ls -l
total 84
-rwxr-xr-x 1 pi pi 12820 Aug 28 22:38 eepdump
-rw-r--r-- 1 pi pi  8112 Aug 28 22:37 eepdump.c
-rwxr-xr-x 1 pi pi  3906 Aug 28 22:37 eepflash.sh
-rwxr-xr-x 1 pi pi 22232 Aug 28 22:38 eepmake
-rw-r--r-- 1 pi pi 15144 Aug 28 22:37 eepmake.c
-rwxr-xr-x 1 pi pi  3122 Aug 28 22:37 eeprom_settings.txt
-rw-r--r-- 1 pi pi  2395 Aug 28 22:37 eeptypes.h
-rw-r--r-- 1 pi pi   677 Aug 28 22:37 Makefile
-rw-r--r-- 1 pi pi  1836 Aug 28 22:37 README.md

Example upload of an .eep file:

text

pi@pi-ms05:~/hats/eepromutils $ sudo ./eepflash.sh -w -f=rpi2pmod.eep -t=24c32 -d=1 -a=50
This will attempt to talk to an eeprom at i2c address 0x50 on bus 1. Make sure there is an eeprom at this address.
This script comes with ABSOLUTELY no warranty. Continue only if you know what you are doing.
Do you wish to continue? (yes/no): yes
Writing...
0+1 records in
0+1 records out
113 bytes copied, 0.728222 s, 0.2 kB/s
Closing EEPROM Device.
Done.

PMOD-EEPROM on a PMOD2RPI interface board, running code from the XIAO Cortex M0+ MCU.

Parts

Qty	Value	Footprint	References
3	0.1uF	Capacitor_SMD:C_0402_1005Metric	C1, C2, C3
3	TestPoint	TestPoint:TestPoint_Keystone_5000-5004_Miniature	TP1, TP2, TP3
2	4.7K	Resistor_SMD:R_0603_1608Metric	R1, R2
1	10K	Resistor_SMD:R_0603_1608Metric	R3
1	JLCPCB_Order_Number_Placeholder	FM4DD:JLCPCB_Order_Number_Placeholder	Ref**
1	Logo_KiCad_5mm	FM4DD:KiCad-Logo2_5mm_SilkScreen	L1
1	M24M01-R	Package_SO:SOIC-8_3.9x4.9mm_P1.27mm	U1
1	PMOD_02x06	FM4DD:PMODHeader_2x06_P2.54mm_Horizontal	J2
1	PMOD_02x06	FM4DD:PMODPinSocket_2x06_P2.54mm_Horizontal	J1
1	SW_DIP_x04	Button_Switch_THT:SW_DIP_SPSTx04_Slide_6.7x11.72mm_W7.62mm_P2.54mm_LowProfile	SW1

Questions

How big is the Eeprom PCB?

It measures 41 × 20.3 mm and has 2 copper layers, 0.8 mm thick.

What parts does the Eeprom use?

15 parts. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.

Where can I download the Eeprom KiCad files?

From the fm4dd/pmod-eeprom repository on GitHub, at the commit this page was made from: the board is kicad-t6a/eeprom.kicad_pcb and its schematic kicad-t6/eeprom.kicad_sch. PCBKit opens the board in the browser, with nothing to install.

Can I use the Eeprom design in my own project?

Its repository states no licence, so its author keeps all rights: ask fm4dd before reusing the design.

Category and platform

FPGA and programmable logic FPGA and CPLD

Topics

pmod i2c eeprom fpga m24m01

Project files

Show this board on your page

A live frame, for any web page

<iframe src="https://pcbkit.io/embed/boards/fm4dd-pmod-eeprom-eeprom-2" title="Eeprom in PCBKit" width="100%" height="480" style="border:0;border-radius:12px" allow="fullscreen" loading="lazy"></iframe>

A picture

<img src="https://pcbkit.io/embed/boards/fm4dd-pmod-eeprom-eeprom-2.jpg" alt="Eeprom" width="1200" height="900">

A picture that opens the board, for a README

[![Eeprom](https://pcbkit.io/embed/boards/fm4dd-pmod-eeprom-eeprom-2.jpg?size=s)](https://pcbkit.io/boards/fm4dd-pmod-eeprom-eeprom-2)

Source

Repository: fm4dd/pmod-eeprom
Board file: kicad-t6a/eeprom.kicad_pcb
Commit: c40ae99
Licence: Not stated

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