HardLabs

Totem trackpoint

DhruvBhatia0·BlueBird·PCB/totem_trackpoint/totem_trackpoint.kicad_pcb

Totem trackpoint PCB layout, top view — open source RP2040/RP2350 board by DhruvBhatia0

About the Totem trackpoint PCB

Totem trackpoint is an open source RP2040/RP2350 PCB design by DhruvBhatia0, published on GitHub under the CERN-OHL-P-2.0 license. It is a 4-layer board measuring 258.8 × 94.4 mm, with 131 components from 23 distinct parts.

Its main chip is the Waveshare RP2040-Zero (castellated), from the RP2040/RP2350 family. Other key parts include the TPS2553DBVR-1 and SN74LVC2G14DCKR. By type, the board carries 13 resistors, 9 capacitors, 6 ICs and 3 connectors.

It belongs with the keyboards designs in this gallery.

From the project

Five-column TOTEM TrackPoint keyboard with hot-swap Choc keys, underside RGB, and acrylic enclosure

- download the ZIP file - upload the ZIP file to the website of the manufacturer. - sometimes the Gerber preview from JLCPCB can't display the PCB, even when the files are fine. In this case use these dimensions: 258.7mm * 94.35mm - PCB Thickness 1.6mm - 2 layers - PCB Qty as much as you like. One PCB is a full keyboard. - PCB Color Black (or any other color you like) - No impedance control - Surface Finish HASL(with lead) if you want the easiest soldering experience or LeadFree HASL. - Remove Order Number Yes

Totem trackpoint, from the project README
From the project README

Main components on the Totem trackpoint

Waveshare RP2040-Zero (castellated)TPS2553DBVR-1SN74LVC2G14DCKR

Totem trackpoint bill of materials (BOM)

131 components, 23 distinct parts — part numbers from the project's BOM.

QtyPartRefs
2
Waveshare RP2040-Zero (castellated)
U1, U2
2
TPS2553DBVR-1
U3, U4
2
SN74LVC2G14DCKR
U5, U6
2
MJ-4PP-9
J1, J2
1
Molex 200528-0080 (SK8707 host)
J3
2
10u 10V X5R DNP - USB inrush limit
CBULKL1, CBULKR1
10
100n X7R
CLEDL1, CLEDL2, CLEDL3, CLEDL4, CLEDL5, CLEDR1, CLEDR2, CLEDR3 +2
2
10u 10V X5R
CLINKL1, CLINKR1
37
D_Small
DL1, DL2, DL3, DL4, DL5, DL6, DL7, DL8 +29
10
WS2812C-2020-V1
LEDL1, LEDL2, LEDL3, LEDL4, LEDL5, LEDR1, LEDR2, LEDR3 +2
2
330R
RLEDL1, RLEDR1
37
SW_PUSH_45DEG
SW_Push_45deg
SWL1, SWL2, SWL3, SWL4, SWL5, SWL6, SWL7, SWL8 +29
1
100n DNP
C201
5
100n X7R
C202, C301, C302, C303, C304
1
1u X7R
C203
2
100n X7R split buffer
C401, C402
2
5.6k 1%
R201, R202
1
10k DNP
R203
2
59.0k 1% (500mA ILIM)
R301, R302
2
330R split TX source
R401, R402
Show 3 more
QtyPartRefs
2
1.0k split RX contention limit
R403, R404
2
47k 1% cable RX pull-down
R411, R421
2
47k 1% local TX pull-up
R412, R422

Totem trackpoint design files

The KiCad project lives in the DhruvBhatia0/BlueBird repository on GitHub; these links point at the commit this page was built from.

Totem trackpoint: common questions

What microcontroller does the Totem trackpoint use?

The Totem trackpoint is built around the Waveshare RP2040-Zero (castellated), from the RP2040/RP2350 family.

How big is the Totem trackpoint PCB?

The Totem trackpoint measures 258.8 × 94.4 mm, has 4 copper layers and is 1.6 mm thick.

How many components are on the Totem trackpoint?

131 components, from 23 distinct parts, with part numbers taken from the project's own BOM. The full bill of materials is listed on this page.

Where can I download the Totem trackpoint design files?

From the DhruvBhatia0/BlueBird repository on GitHub, which has the KiCad layout, the schematic and the BOM; the links under Design files point to each one.

Can I use the Totem trackpoint design in my own project?

Yes, under the terms of its CERN-OHL-P-2.0 license, which DhruvBhatia0 chose for the repository.

Can I test firmware for the Totem trackpoint without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug RP2040/RP2350 firmware against it before you order a PCB.

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