2 layers36.4 × 29.4 mm
Kicad Smart Watch
AFLProjects/DIY-Smart-Watch
DIY Smart Watch with ATMEGA32U4 , ST7789 SPI display and RV3028-C7 Extreme Low Power RTC Module
63 parts12
2 layers15.2 × 31.1 mm
OlmBoard v1
azerimaker/olmBoard8This is a TPS62840 based, highly-efficient, breadboard-friendly buck converter
- Size
- 15.2 × 31.1 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 25
- Nets
- 13
- Pads
- 63
- Tracks, vias
- 167, 33
- Pours
- 6
- Routed
- Yes
- KiCad
- KiCad 5 (file 20171130)
- Created
- 3 Dec 2019
- Updated
- 4 Dec 2019
Overview
OlmBoard v1 is an open-source printed circuit board by azerimaker, from the azerimaker/olmBoard repository on GitHub, published under the MIT licence. It is a 2-layer board of 15.2 × 31.1 mm with 25 parts on 13 nets, routed with 167 tracks and 33 vias.
It is built around the TPS62840DLCR. Its parts include 5 capacitors, 5 resistors, 3 connectors, 1 IC and 1 inductor.
Main components
1README
README.mdolmBoard v0.1
This is a TPS62840 based, ultra-low quiescent current, highly-efficient, breadboard-friendly buck converter module w/:
- Selectable outputs (1.8-3.3 V)
- 60nA Iq, 150nA @ 100% mode
- 20nA shutdown current
- 750mA max output current
Inital sweep load test results w/ 0.1A and 10 sec increments using EBD-USB load tester. The module works well up to 1A loads (short term), recommended max output current is 750mA. Voltage drop in the graph is due to the USB cable drop, actual voltage is stable around 3.3V up to 1A loads.
Parts
25| Qty | Value | Footprint | References |
|---|---|---|---|
| 6 | Rset | Jumper:SolderJumper-2_P1.3mm_Open_TrianglePad1.0x1.5mm | JP4, JP5, JP6, JP7, JP8, JP9 |
| 3 | 10uF | Capacitor_SMD:C_0603_1608Metric | C1, C3, C4 |
| 2 | 4.7uF | Capacitor_SMD:C_0603_1608Metric | C2, C5 |
| 1 | 11K5 | Resistor_SMD:R_0603_1608Metric | R2 |
| 1 | 1K74 | Resistor_SMD:R_0603_1608Metric | R1 |
| 1 | 2.2uH | my_passives_footprints:L_0806 | L1 |
| 1 | 267K | Resistor_SMD:R_0603_1608Metric | R4 |
| 1 | 52K3 | Resistor_SMD:R_0603_1608Metric | R3 |
| 1 | Conn_A | Connector_PinHeader_2.54mm:PinHeader_1x04_P2.54mm_Vertical | J2 |
| 1 | Conn_B | Connector_PinHeader_2.54mm:PinHeader_1x04_P2.54mm_Vertical | J3 |
| 1 | DNM | Resistor_SMD:R_0603_1608Metric | R5 |
| 1 | EN | Jumper:SolderJumper-3_P1.3mm_Bridged12_RoundedPad1.0x1.5mm_NumberLabels | JP1 |
| 1 | JST_PH | Connector_JST:JST_PH_S2B-PH-SM4-TB_1x02-1MP_P2.00mm_Horizontal | J1 |
| 1 | M2-MountingHole | MountingHole:MountingHole_2.2mm_M2_DIN965_Pad | H1 |
| 1 | Mode | Jumper:SolderJumper-3_P1.3mm_Bridged12_RoundedPad1.0x1.5mm_NumberLabels | JP2 |
| 1 | STOP | Jumper:SolderJumper-2_P1.3mm_Bridged_RoundedPad1.0x1.5mm | JP3 |
| 1 | TPS62840DLC | voltage_regulators:SON-8-1.5x2mm_P0.5mm | U1 |
Questions
How big is the OlmBoard v1 PCB?
It measures 15.2 × 31.1 mm and has 2 copper layers, 1.6 mm thick.
What parts does the OlmBoard v1 use?
25 parts, built around the TPS62840DLCR. 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 OlmBoard v1 KiCad files?
From the azerimaker/olmBoard repository on GitHub, at the commit this page was made from: the board is olmBoard-hw/olmBoard-v1/olmBoard-v1.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the OlmBoard v1 design in my own project?
Its repository publishes it under the MIT licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).
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