MirkoPC -> CM4 carrier board

2021-05-07: current status -> 2nd batch is under PCB manufacturing, please see the log from factory:

next step is the automated assembly process, shipping, customs, etc. manual soldering, testing, packaging and shipping - lot of work to do.

Hello!

2nd batch is under manufacturing (started week ago).

All the components are ordered! Even if we have huge component shortage.

I'm trying to make the impossible possible.

PCB boards are under manufacturing. Please see the current status.

I had and serious issue with my PCB manufacturer, but now is fixed (shame I lost about 4 days, really sorry).

All the assembled and tested boards should be available to ship at the first week of June.

#MirkoPC dedicated enclosure under development...

I know that this is not the perfect 3d printing but we are fighting to improve the model.

Anyway enclosure look so sexy! It's only about 10x10cm.

Size really matters!

We are working on dedicated enclosure for MirkoPC - so far for first hardware revision R1.0:

This only very basic concept and quite ugly 3d printed models

added solder bridges for disconnecting and free used GPIOs:

new FAN #2 socket (drived from NPN transistor):

FAN #3 - fan controller EMC2301:

- new smaller buzzer (without embedded generator):

- new buck regulator for M.2 socket (3.3V/3A):

- new marking:
- USB-C issue fixed:

- changed headphone amplifier TPA6130A2 (with I2C bus and hardware volume control):

Main features and updates (compared to R1.0):
- new power button (slide switch) controlled by MCU (ATtiny),
- added 2 fan sockets (FAN #2 -> NPN transistor, FAN #3 -> EMC2301 controller),
- new microSD slot location (near to the PCB edge),
- improved 5V power rail (added extra vias, large capacitor),
- fixed USB-C issue (similar as on the Raspberry Pi 4B),
- removed eMMC BGA chip (due to collision with microSD),
- added slide switch for selecting USB mode (instead of 3-pin jumper J201),
- added solder jumpers for future disconnecting GPIO pins used for features as DAC, buzzer, status LEDs,
- new buzzer, smaller (without embedded generator),
- changed headphone amplifier with I2C bus and hardware volume control (TPA6130A2 instead TPA6133A2 due to IC shortage),
- replaced 3.3V/3A buck controller for M.2 socket (due to IC shortage),
- added ICT testopints,
- new silkscreen marking added,
- removed no needed pin headers (GLOBAL_EN and RUN_PG.

new slide switch for boot select:

new location of the microSD slot:

added ICT testopoints:

new power button (slide switch), controller by AVR attiny MCU:
improved 5V power rail (added large capacitor, removed polymer fuse, more vias added, copper track widen):

Hi

I have good news for everyone interested in the project - today, after over 7 days of work, I officially released the new version of the project (REV1.1).

The update was delayed by about 3-4 days due to the addition of 2 additional functions (power switch, fan controller) and other matters not related to the project.

Here you can download 3D PDF file of the current project (please use Adobe Acrobat Reader):

https://github.com/mfolejewski/MirkoPC/tree/main/REV1.1

Here you can find the 3D view of the PCB REV1.1:

Hi

Please check topic on Twitter about to change power switch from slide to tact version.

I'm just thinking to change the current slide switch.

This change will delay project about 2 days (extra design), but without extra costs (I'm trying to use cheap MCU).

Extra features:

- logic from LTC2954:

After shutdown OS 5V power supply rail can be automatically turned off.

Extra features for the future (not for REV1.1 -> needed firmware):

- wake up mode from RTC (alarm)

- standby mode -> driving status 2 LEDs RED/GREEN

- wake up from IR remote control

https://twitter.com/Mirek34416541/status/1385534232454438914

pic:

Hi

I'm working on to order the next batch.

This week I will modify the design I will order 30 pcs for 2nd batch.

If you did not receive DM message from me - please contact me!

I'm waiting until the end of the next weekend (24-25.04) and then I will order the PCBs and manufacturing.

Finally I removed not used eMMC chip:

before:

after redesign: