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46 commits

Author SHA1 Message Date
Vlastimil Slinták
08c5c439c9 Fixed GNSS TX/RX mixup and several ERC issues 2025-12-08 22:33:57 +01:00
Vlastimil Slinták
01e1dd834f Update "issue date" in the whole project 2025-12-03 12:29:20 +01:00
Vlastimil Slinták
a7eb8aff75 Remove whitespaces in PN and MPN fields 2025-12-02 10:12:40 +01:00
Vlastimil Slinták
df0bbd8cfb Populate 10kOhm resistor simulating a battery thermistor 2025-12-01 19:27:17 +01:00
Vlastimil Slinták
83a4ad6d3f Minor layout tweaks 2025-12-01 15:22:20 +01:00
Vlastimil Slinták
2b1a109265 Add PPTC fuse to the battery 2025-12-01 14:19:10 +01:00
Vlastimil Slinták
8cf8226d6b Update issue date and revision number 2025-11-25 14:54:23 +01:00
Vlastimil Slinták
dba2268b71 Fixed capacitors for the BQ25792 2025-11-25 14:54:23 +01:00
Vlastimil Slinták
90201b2195 Minor schematics tweaks and pinout optimizations 2025-11-25 14:54:23 +01:00
Vlastimil Slinták
e6c4f79742 Changed 5V DC/DC buck to TPS565242 
Original buck has 2 A maximum current output. New one has up to 5 A.
Our design needs ~3 A maximum current.

Fixes #38
 2025-11-25 14:54:23 +01:00
Vlastimil Slinták
70acae8a4c Added power management ATTiny826 
Fixes #32
Fixes #35
Fixes #23
 2025-11-25 14:54:23 +01:00
Vlastimil Slinták
553713cdb0 Removed battery voltage divider and U_BATT_MON signal to SoM 
Battery voltage can and will be measured by the BQ25792RQ IC via I2C
register.
 2025-11-25 14:54:23 +01:00
Vlastimil Slinták
b54ec7e958 Removed unused components, connected power signals to the SoM 2025-11-25 14:54:23 +01:00
Vlastimil Slinták
c4ccd7cfb9 Changed USB charger inductor to smaller version 
Original inductor recommended by manufacturer was for up to 14A (I_sat).
LinHT doesn't need currents like this, so smaller inductor for 8 A is used.
This will save some space as a new component is smaller in every dimension.
 2025-11-25 14:54:23 +01:00
Vlastimil Slinták
a2a7dab905 Fixed and added LCSC reference numbers for all components 2025-11-25 14:54:23 +01:00
Vlastimil Slinták
abbd0af731 Added USB charger based on BQ25792 
This is not a final version as there are still several TODOs, see
schematics for details.
 2025-11-25 14:54:23 +01:00
Vlastimil Slinták
a1de4e23e6 Minor fixes in component part numbers 2025-11-25 14:54:23 +01:00
Vlastimil Slinták
44ce501a89 Changed revision to "B" and updated dateof the project 2025-11-25 14:54:23 +01:00
Vlastimil Slinták
0bf36053a8 Updated parameters of the 5V power rail 2025-11-25 14:54:23 +01:00
Vlastimil Slinták
981314ff52 Modified LCSC attributes 2025-11-25 14:54:23 +01:00
Vlastimil Slinták
683f1ef7d1 Added a 1.8 V LDO for the digital IOs 
This simple LDO will serve as a powersource for the audio codec and
any other IC with 1.8V IOVCC.
 2025-11-25 14:54:23 +01:00
Wojciech Kaczmarski
e80deca250 BOM update 
- changed the case of 74AHC1G86
- R23 changed to 133k
- pdf render
 2025-07-29 20:23:25 +03:00
Vlastimil Slinták
d80b2bdfc4 Added BOM assigment for most of the parts 2025-07-29 20:23:25 +03:00
Wojciech Kaczmarski
f86341ef56 added GND vias 
- updated PDF render
 2025-07-28 16:58:25 +03:00
Vlastimil Slinták
a602204754 Connected battery voltage to the SoM ADC input 2025-07-28 16:58:25 +03:00
Wojciech Kaczmarski
b8413e6fb0 tiny changes 
- rearranged the `SWITCH_ON_OFF` connection on the root page slightly
- updated the date
- updated PDF render
 2025-07-28 16:58:25 +03:00
Vlastimil Slinták
44fb812e66 Changed footprint of the C16 capacitor from 1206 to 0402 2025-07-28 16:58:25 +03:00
Vlastimil Slinták
49f5e1c6f7 Fixed majority of ERC warnings and errors 2025-07-28 16:58:25 +03:00
Vlastimil Slinták
f2776fc459 Assigned missing footprints 2025-07-28 16:58:25 +03:00
Vlastimil Slinták
4c3c49e379 Added on/off switch and volume pot to schematics and layout 2025-07-23 12:36:08 +03:00
Wojciech Kaczmarski
8ab5ceccd6 re-arranged the schematic at "root" 2025-07-21 10:39:14 +03:00
Wojciech Kaczmarski
b62ca16bca update 
- brought some order to page 1
- routed on/off signals
-added SoM pin #10
- rendered PDF
 2025-07-20 21:03:05 +03:00
Vlastimil Slinták
04f8da908a Assigned footprint and layout position of the battery connector 2025-07-19 13:00:08 +03:00
Wojciech Kaczmarski
357ef87f21 minor power on/off circuit tweaks 2025-07-17 20:10:45 +02:00
Wojciech Kaczmarski
f2454bd04e tweaked the power-on circuit 
- supplied the XNOR gate with 5V instead of 3.3V
- added a MOSFET to drive the 3.3V DC/DC converter's EN pin
- removed a pull-up resistor at the ON/OFF line
 2025-07-17 18:58:02 +02:00
Wojciech Kaczmarski
65883bae14 updates 
- updated the 5V line (diode connected sources - USB and DC/DC)
- proposed a power on-off circuit based on a XNOR gate
- reannotated the schematic
- updated the PDF
 2025-07-15 17:57:29 +02:00
Vlastimil Slinták
77d46b0506 Changed all EOLs from Windows (CRLF) to Unix style (LF) 
Unix style end-of-lines is standard in KiCAD world:
https://klc.kicad.org/general/g1/g1.7.html
 2025-07-14 16:50:00 +02:00
Wojciech Kaczmarski
18195bee4c date, pdf plot 2025-07-13 22:15:21 +02:00
Vlastimil Slinták
f4f206ae14 Added second step-down converter for 3.3 V 
* Second TPS562203-based converter for 3.3 V rail.
* Changed inductors for a thinner variant 2.8 mm instead of 4.8 mm
* Recommended inductors are SRN6028-4R7M or FNR6028S4R7MT
* Removed 3.3V LDO output from the SoM
 2025-07-13 22:13:02 +02:00
Wojciech Kaczmarski
34868eeb58 added missing mic path 2025-07-10 15:49:08 +02:00
Vlastimil Slinták
2665a6d910 Added 5V DC/DC converter for 2S battery input 
* Maximum expected power consumption: 3.2 W
* Maximum output current from the DC/DC converter: 0.65 A + 20%
* L3 inductor is missing footprint, will be added later
 2025-07-09 22:12:30 +02:00
Vlastimil Slinták
69a66d7890 Updated credits 2025-07-09 21:09:12 +02:00
Wojciech Kaczmarski
19294d287b SOM pins update 2025-07-09 12:51:19 +02:00
Wojciech Kaczmarski
abd7fbc6b2 WIP SOM update 2025-07-07 16:22:57 +02:00
Wojciech Kaczmarski
e0c8f223c0 WIP SOM update 2025-07-06 21:40:13 +02:00
Wojciech Kaczmarski
8f9bde9f60
init push 2025-06-05 20:28:55 +02:00