2 layers39.2 × 15.9 mm
2 layers45 × 58.2 mm
Opentama
Sparkr-tech/opentama237An open-source reference design for MCUGotchi
- Size
- 45 × 58.2 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 65
- Nets
- 69
- Pads
- 251
- Tracks, vias
- 728, 114
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 7 (file 20221018)
- Created
- 19 Apr 2022
- Updated
- 12 Jul 2023
Overview
Opentama is an open-source printed circuit board by Sparkr-tech, from the Sparkr-tech/opentama repository on GitHub. It is a 2-layer board of 45 × 58.2 mm with 65 parts on 69 nets, routed with 728 tracks and 114 vias.
It is built around the TPS62203DBV, LTC4054ES5-4.2#PBF and USBLC6-2SC6, with the BSS138 and BSS84 among its other parts. Its parts include 23 resistors, 16 capacitors, 5 connectors, 4 ICs and 3 transistors. It belongs with the STM32 boards of this library.
Main components
5
TPS62203DBV
SOT-23-5-40℃~+85℃@(TA) 1 15uA 1MHz 2.5V~6V 3.3V 300mA Buck Buck Built-in Fixed Yes SOT-23-5 DC-DC Converters ROHSTexas InstrumentsDC-DC ConvertersLTC4054ES5-4.2#PBF
SOT-23-5-40℃~+85℃ 1 200uA 4.25V~6.5V 4.2V 800mA Charging IC Lithium Battery Not supported Not supported SOT-23-5 Battery Management ROHSAnalog DevicesBattery Management
USBLC6-2SC6
SOT-23-60.35pF、0.8pF 100nA 150W@8/20us 15V 2 5V 6A@8/20us 6V ESD SOT-23-6 ESD and Surge Protection (TVS/ESD) ROHSUMWESD And Surge Protection (TVS/ESD)
BSS138
SOT-23-55℃~+150℃ 1 N-channel 1.1Ω@10V、1.2Ω@4.5V 1.2V 1.7nC@10V 17.5pF 340mA 350mW 50V 6.5pF N-Channel SOT-23 MOSFETs ROHShongjiachengMOSFETsBSS84
SOT-23-55℃~+150℃ 1 P-Channel 130mA 2.8pF 24.6pF 2V 3.2Ω@5V 300mW 4.7pF 50V 590pC@10V SOT-23 MOSFETs ROHSDiodes IncorporatedMOSFETs
README
README.mdOpenTama - An open-source reference design for MCUGotchi
Synopsis
OpenTama is an open-source development board serving educational purposes, specifically designed for MCUGotchi using KiCad.
It features:
- a low-power STM32L072CBT MCU
- either a backlit 128x64 LCD UC1701x or a 128x64 OLED SSD1306 display
- an RGB LED for notifications
- a piezoelectric speaker
- a 1000mAh battery
- a USB C connector for data and charging
- three buttons
Being an open-source hardware design, anyone can manufacture his/her own board. Furthermore, all components have been placed on the top side of the board, so that the assembly as well can be performed by EMS such as JLCPCB, even for small quantities. The battery and screen must be soldered manually.
Build instructions
Hardware
-
Make or buy an OpenTama board
If you decide to build it, please note that the JLCPCB references for all the components have already been provided in the project. However, those have been selected depending on their availability at a specific point in time, and will probably need adjustments if you decide to go with JLCPCB.
-
Decide if you want an SSD1306 OLED screen or a UC1701x LCD screen, and buy it
The UC1701x LCD is a low power display compared to the SSD1306 OLED that drains way more power. However, if you plan to use the MCUGotchi firmware, the highest power consumption will come from the MCU that will not really have time to sleep, so your choice will not have a big impact on the overall power consumption.
If you want to use an SSD1306, the board expects a regular 7-pin 0,96" integrated module. However, if you want a UC1701x, you just need the LCD itself, and you can either choose an FPC one (0.5mm pitch, 14 pins), or one that needs to be soldered (0.6mm pitch, 14 pins).
For reference, we used this one. -
Buy a a battery
The design has been made assuming a 1000mAh 40x30x12mm Li-Po/Li-ion battery.
For reference, we used this one. -
Plug or solder the display
-
Solder the battery
-
Your OpenTama board is ready !
Software
-
Build the firmware of your choosing
For instance, checkout the MCUGotchi repository and follow the instructions to build it for the OpenTama board.
-
Get and build dfu-util
-
Boot the board in DFU mode
Close the BOOT0 jumper at the top of the board, and while doing so, trigger a reset by connecting together the NRST and GND pins at the right of the board.
- Program the board using dfu-util
$ cd mcugotchi
$ sudo make flashor
$ sudo dfu-util -a 0 -s 0x08000000:leave -D <firmware.bin>- Enjoy !
License
OpenTama is distributed under the CERN-OHL-S v2 license. See the LICENSE file for more information.
__
Copyright (C) 2022 Sparkr
Parts
65| Qty | Value | Footprint | References |
|---|---|---|---|
| 4 | 100nF | Capacitor_SMD:C_0402_1005Metric | C5, C8, C9, C10 |
| 4 | 20k | Resistor_SMD:R_0402_1005Metric | R20, R21, R23, R24 |
| 3 | 220k | Resistor_SMD:R_0402_1005Metric | R14, R15, R16 |
| 3 | 330 | Resistor_SMD:R_0402_1005Metric | R11, R12, R13 |
| 2 | 0 | Resistor_SMD:R_0603_1608Metric | R7, R19 |
| 2 | 10k | Resistor_SMD:R_0402_1005Metric | R2, R8 |
| 2 | 12pF | Capacitor_SMD:C_0402_1005Metric | C2, C3 |
| 2 | 2.2uF/5V | Capacitor_SMD:C_0402_1005Metric | C13, C15 |
| 2 | 330 | Resistor_SMD:R_0603_1608Metric | R4, R5 |
| 2 | 5.1k | Resistor_SMD:R_0402_1005Metric | R17, R18 |
| 2 | BSS138 | Package_TO_SOT_SMD:SOT-23 | Q1, Q2 |
| 1 | 100 | Resistor_SMD:R_0402_1005Metric | R9 |
| 1 | 100k | Resistor_SMD:R_0402_1005Metric | R22 |
| 1 | 100nF | Capacitor_SMD:C_0603_1608Metric | C16 |
| 1 | 10nF | Capacitor_SMD:C_0402_1005Metric | C14 |
| 1 | 10uF | Capacitor_SMD:C_1206_3216Metric | C6 |
| 1 | 10uF | Capacitor_SMD:C_0603_1608Metric | C4 |
| 1 | 10uH | Inductor_SMD:L_Sunlord_MWSA0518_5.4x5.2mm | L1 |
| 1 | 1k | Resistor_SMD:R_0603_1608Metric | R3 |
| 1 | 1k | Resistor_SMD:R_0402_1005Metric | R10 |
| 1 | 1uF | Capacitor_SMD:C_1206_3216Metric | C7 |
| 1 | 1uF | Capacitor_SMD:C_0603_1608Metric | C12 |
| 1 | 2k 1% | Resistor_SMD:R_0603_1608Metric | R6 |
| 1 | 32768Hz - 12,5 pF | Crystal:Crystal_SMD_3215-2Pin_3.2x1.5mm | Y1 |
| 1 | 330nF/25V | Capacitor_SMD:C_0603_1608Metric | C11 |
| 1 | 39nH | Inductor_SMD:L_0402_1005Metric | L2 |
| 1 | 4.7uF | Capacitor_SMD:C_1206_3216Metric | C1 |
| 1 | BOOT0 | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | JP1 |
| 1 | BSS84 | Package_TO_SOT_SMD:SOT-23 | Q3 |
| 1 | Battery_Cell | OpenTama:Battery_Pads_4x4 | BT1 |
| 1 | Conn_01x07 | Connector_PinHeader_2.54mm:PinHeader_1x07_P2.54mm_Vertical | J3 |
| 1 | Conn_01x09 | Connector_PinHeader_2.54mm:PinHeader_1x09_P2.54mm_Vertical | J1 |
| 1 | Conn_01x14 | OpenTama:LCD_14p_0.6mm | J5 |
| 1 | Conn_01x14 | OpenTama:Hirose_FH34SRJ-14S-0.5SH_1x14-1MP_P0.50mm_Horizontal | J2 |
| 1 | LED_RGB | OpenTama:LED_RGB_TC5050 | D1 |
| 1 | LEFT | Button_Switch_SMD:SW_Push_1P1T_NO_6x6mm_H9.5mm | SW1 |
| 1 | LOGO | OpenTama:Sparkr_Logo | G*** |
| 1 | LTC4054ES5-4.2 | Package_TO_SOT_SMD:TSOT-23-5 | U2 |
| 1 | Lapin | OpenTama:Lapin | G*** |
| 1 | MIDDLE | Button_Switch_SMD:SW_Push_1P1T_NO_6x6mm_H9.5mm | SW2 |
| 1 | No BATT | Jumper:SolderJumper-2_P1.3mm_Open_RoundedPad1.0x1.5mm | JP2 |
| 1 | RIGHT | Button_Switch_SMD:SW_Push_1P1T_NO_6x6mm_H9.5mm | SW3 |
| 1 | STM32L072CBTx | Package_QFP:LQFP-48_7x7mm_P0.5mm | U3 |
| 1 | Speaker_Crystal | Buzzer_Beeper:Buzzer_CUI_CPT-9019S-SMT | LS1 |
| 1 | TPS62203DBV | Package_TO_SOT_SMD:SOT-23-5 | U1 |
| 1 | USBLC6-2SC6 | Package_TO_SOT_SMD:SOT-23-6 | U4 |
| 1 | USB_C_Receptacle_USB2.0 | Connector_USB:USB_C_Receptacle_HRO_TYPE-C-31-M-12 | J4 |
The 64 most common of 65 parts.
Questions
How big is the Opentama PCB?
It measures 45 × 58.2 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Opentama use?
65 parts, built around the TPS62203DBV, LTC4054ES5-4.2#PBF, USBLC6-2SC6 and BSS138. 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 Opentama KiCad files?
From the Sparkr-tech/opentama repository on GitHub, at the commit this page was made from: the board is OpenTama.kicad_pcb and its schematic OpenTama.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Opentama design in my own project?
Its repository states no licence, so its author keeps all rights: ask Sparkr-tech before reusing the design.
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