Chewing gum
About the Chewing gum PCB
Chewing gum is an open source PCB design by esl-epfl, published on GitHub. It is a 2-layer board measuring 13.1 × 49.3 mm, with 23 components from 19 distinct parts.
Other key parts include the INA212AIDCKR and 24AA02E-OT. By type, the board carries 10 connectors, 6 resistors, 3 capacitors, 2 ICs and 1 diode.
It belongs with the usb & debug tools designs in this gallery.
From the project
This is a set of PCBs to test, in principle, X-HEEP chips (CHEEPs)... but, you can use it to test any chip you want, for what it matters.
This is a set of PCBs to test, in principle, X-HEEP chips (CHEEPs)... but, you can use it to test any chip you want, for what it matters.
The general idea is to recycle efforts, so all the things that are common to any CHEEP were moved into a main board. This one includes an FTDI through which you can program or communicate with your cheep, as well as some peripherals like flash, buttons, LEDs, etc. The main board also generates all the voltages needed by these blocks.
Main components on the Chewing gum
Chewing gum bill of materials (BOM)
23 components, 19 distinct parts — part numbers from the project's BOM.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | INA212AIDCKR | SOT-363_SC-70-6 | IC1 |
| 1 | 24AA02E-OT TLV75801PDBV | SOT-23-5 | U1 |
| 1 | C1509219 Conn_01x03 | PinSocket_1x03_P2.54mm_Vertical | J1 |
| 1 | Conn_Coaxial | SMA_Amphenol_901-144_Vertical | J2 |
| 1 | Conn_01x03 | PinSocket_1x03_P2.54mm_Vertical | J3 |
| 3 | Conn_02x01 | PinHeader_1x02_P2.54mm_Vertical | J4, J5, J11 |
| 2 | Conn_01x06 | PinHeader_1x06_P1.27mm_Vertical | J7, J8 |
| 2 | Conn_01x04 | PinHeader_1x04_P1.27mm_Vertical | J9, J10 |
| 1 | C83694 500K | Potentiometer_Bourns_3296W_Vertical | RV1 |
| 1 | LED | LED_0603_1608Metric | D1 |
| 1 | 0.1U 10u | C_0603_1608Metric | C1 |
| 1 | 0.1U 0.1u | C_0603_1608Metric | C2 |
| 1 | 4.7U 22u | C_0603_1608Metric | C3 |
| 1 | 1k | R_0603_1608Metric | R1 |
| 1 | 3.3K 10k | R_0603_1608Metric | R2 |
| 1 | 10K 46k4 | R_0603_1608Metric | R3 |
| 1 | 20K 48.7k | R_0603_1608Metric | R4 |
| 1 | 20K 36k | R_0603_1608Metric | R5 |
| 1 | 36K 0.02 | R_2512_6332Metric | R6 |
Chewing gum design files
The KiCad project lives in the esl-epfl/CHEEP-boards repository on GitHub; these links point at the commit this page was built from.
Chewing gum: common questions
How big is the Chewing gum PCB?
The Chewing gum measures 13.1 × 49.3 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the Chewing gum?
23 components, from 19 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 Chewing gum design files?
From the esl-epfl/CHEEP-boards 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 Chewing gum design in my own project?
The repository has no license, so all rights stay with esl-epfl. Use it as a reference, and ask the author before reusing the design.
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