2 layers30.1 × 11.9 mm
4 layers80 × 50.5 mm
Loeti
elagil/loeti5Soldering equipment for JBC irons
- Size
- 80 × 50.5 mm
- Copper layers
- 4
- Thickness
- 1.6 mm
- Parts
- 110
- Nets
- 107
- Pads
- 421
- Tracks, vias
- 463, 122
- Pours
- 12
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 15 Oct 2024
- Updated
- 7 Feb 2026
Overview
Loeti is an open-source printed circuit board by elagil, from the elagil/loeti repository on GitHub. It is a 4-layer board of 80 × 50.5 mm with 110 parts on 107 nets, routed with 463 tracks and 122 vias.
It is built around the STM32G431CBT6, TLV2333ID and INA301A1IDGKR, with the TPS61040DBV, TPS62177DQCR and 74AHC1G08SE among its other parts. Its parts include 40 resistors, 34 capacitors, 10 ICs, 10 diodes and 5 transistors. It belongs with the STM32 boards of this library.
Main components
12
STM32G431CBT6
LQFP-48(7x7)-40℃~+85℃ 1.71V~3.6V 128KB 12bit 12bit 170MHz 32 Bit 32KB 38 ARM Cortex-M4F Built-in FLASH LQFP-48(7x7) Microcontrollers (MCU/MPU/SOC) ROHSSTMicroelectronicsMicrocontrollers (MCU/MPU/SOC)
TLV2333ID
SOIC-8-2.75V~-900mV、900mV~2.75V -40℃~+125℃ 0.16V/us 1.8V~5.5V 102dB 140pA 17uA 2 20nV/℃ 2uV 350kHz 55nV/√Hz@1kHz 5mA 70pA EMI filtering/RF suppression、Zero drift / auto-zero、Reverse-phase input protection Rail-to-Rail Input, Rail-to-Rail Output SOIC-8 Precision Op Amps ROHSTexas InstrumentsPrecision Op Amps
INA301A1IDGKR
VSSOP-8-40℃~+125℃ 0.5uV/℃ 0V~36V 1 110dB 120uA 2.7V~5.5V 20V/V 25uV 4V/us 550kHz 650uA High-side detection、Low-side detection、Zero drift / auto-zero、Programmable threshold alarm、Built-in comparator ±40V VSSOP-8 Current Sense Amplifiers ROHSTexas InstrumentsCurrent-Sensing Amplifiers
TPS61040DBV
SOT-23-5-40℃~+125℃@(TJ) 1 1.8V~6V 1MHz 28V 28uA 400mA Adjustable Boost Boost Built-in No Overcurrent Protection、Light load efficient mode SOT-23-5 DC-DC Converters ROHSTexas InstrumentsLED Drivers
TPS62177DQCR
WSON-10-EP(2x3)-40℃~+125℃@(TJ) 1 1MHz 22uA 3.3V 4.75V~28V 500mA Buck Buck Built-in Fixed Yes WSON-10-EP(2x3) DC-DC Converters ROHSTexas InstrumentsDC-DC Converters
74AHC1G08SE
SOT-353-40℃~+125℃ 1 1.5V~3.85V 1.9V、2.58V、2.9V、3.94V、4.4V 100mV、550mV 1uA 2 2V~5.5V 500mV~1.65V 7.9ns@5V,50pF 74AHC Series 8mA 8mA AND Gate SOT-353 Logic Gates ROHSDiodes IncorporatedLogic GatesEA OLEDS102-6GGA
-OLED DisplayDisplay VisionsM24C64-RMN6TP
SOIC-8-40℃~+85℃ 1.8V~5.5V 1MHz 2.5mA 200 Years 3uA 4,000,000 Cycles 5ms 64Kbit Hardware write protection function、Built-in power-on reset (POR)、Built-in error correction code (ECC) function I2C SOIC-8 EEPROM ROHSSTMicroelectronicsEEPROM
TCPP01-M12
QFN-12-EP(3x3)-40℃~+125℃ 120uA Yes QFN-12-EP(3x3) EMI/RFI Filters (LC, RC Networks) ROHSSTMicroelectronicsEMI/RFI Filters (LC, RC Networks)
USBLC6-2SC6
SOT-23-6L-40℃~+125℃ 150nA 17V 2 3.5pF 5.25V 5A 6V ESD IEC 61000-4-2 Unidirectional SOT-23-6L ESD and Surge Protection (TVS/ESD) ROHSSTMicroelectronicsESD And Surge Protection (TVS/ESD)
0603WAF1002
0603-55℃~+155℃ 100mW 10kΩ 75V Thick Film Resistor ±1% ±100ppm/℃ 0603 Chip Resistor - Surface Mount ROHSUNI-ROYALChip Resistor - Surface Mount
CC0603KRX7R9BB104
0603100nF 50V X7R ±10% 0603 Multilayer Ceramic Capacitors MLCC - SMD/SMT ROHSYAGEOMultilayer Ceramic Capacitors MLCC - SMD/SMT
README
README.mdLöti
Soldering station hardware and firmware, powered by USB PD, delivering up to 100 W.
Supports irons with thermocouples as temperature probes, for example
- JBC C210
- JBC C245
Resources
Updating firmware
On the device, either
- hold the
BOOT-button on the PCB and insert the USB cable into the data/debug port, or - go to the user menu (long-press encoder button), scroll down to
DFU mode, and select.
Once in DFU mode, flash a binary from the release artifacts. For example with
dfu-util -a 0 -s 0x08000000:leave -D <firmware_file_name>.binThe finished product
Parts
110| Qty | Value | Footprint | References |
|---|---|---|---|
| 19 | 10k | Resistor_SMD:R_0603_1608Metric | R3, R4, R10, R11, R12, R13, R14, R15, R16, R17, R19, R26, R28, R30, R35, R36 +3 |
| 16 | 100n | Capacitor_SMD:C_0603_1608Metric | C1, C2, C4, C7, C8, C15, C19, C20, C21, C22, C23, C24, C25, C28, C33, C34 |
| 10 | 1u | Capacitor_SMD:C_0603_1608Metric | C3, C5, C6, C9, C10, C11, C12, C13, C14, C16 |
| 5 | 220k | Resistor_SMD:R_0603_1608Metric | R5, R25, R29, R32, R37 |
| 5 | BAT54S | Package_TO_SOT_SMD:SOT-23 | D1, D2, D4, D9, D10 |
| 4 | B5819W SL | Diode_SMD:D_SOD-123 | D5, D6, D7, D8 |
| 3 | 10u | Capacitor_SMD:C_1206_3216Metric | C27, C31, C32 |
| 3 | 1k | Resistor_SMD:R_0603_1608Metric | R18, R22, R38 |
| 3 | 2M | Resistor_SMD:R_0603_1608Metric | R31, R39, R40 |
| 2 | 22k | Resistor_SMD:R_0603_1608Metric | R23, R24 |
| 2 | 22p | Capacitor_SMD:C_0603_1608Metric | C29, C35 |
| 2 | 33 | Resistor_SMD:R_0603_1608Metric | R1, R2 |
| 2 | 330p | Capacitor_SMD:C_0603_1608Metric | C17, C18 |
| 2 | 5.1k | Resistor_SMD:R_0603_1608Metric | R33, R34 |
| 2 | BC817 | Package_TO_SOT_SMD:SOT-23 | Q2, Q4 |
| 2 | LMDND4040WKT100MM | Inductor_SMD:L_Abracon_ASPI-0425 | L1, L2 |
| 1 | 1 | Resistor_SMD:R_0603_1608Metric | R21 |
| 1 | 33k | Resistor_SMD:R_0603_1608Metric | R7 |
| 1 | 600@100MHz | Inductor_SMD:L_0603_1608Metric | FB1 |
| 1 | 620 | Resistor_SMD:R_0603_1608Metric | R20 |
| 1 | 74AHC1G08 | Package_TO_SOT_SMD:SOT-353_SC-70-5 | U6 |
| 1 | 82u | Capacitor_THT:CP_Radial_D8.0mm_P3.50mm | C26 |
| 1 | BC807 | Package_TO_SOT_SMD:SOT-23 | Q5 |
| 1 | BOOT | Button_Switch_SMD:SW_SPST_TL3342 | SW1 |
| 1 | Conn_01x05_Pin | Connector_PinHeader_2.54mm:PinHeader_1x05_P2.54mm_Horizontal | J5 |
| 1 | DATA | Connector_USB:USB_C_Receptacle_HRO_TYPE-C-31-M-12 | J2 |
| 1 | EA_OLEDS102-6 | display_visions:EA_OLEDS102-6 | U2 |
| 1 | ESDA25P35-1U1M | Diode_SMD:ST_QFN-2L_1.6x1.0mm | D3 |
| 1 | INA301A1 | Package_SO:VSSOP-8_3x3mm_P0.65mm | U9 |
| 1 | Logo_Open_Hardware_Large | Symbol:OSHW-Symbol_6.7x6mm_SilkScreen | oshw1 |
| 1 | M24C64-RMN | Package_SO:SOIC-8_3.9x4.9mm_P1.27mm | U3 |
| 1 | POWER | Connector_USB:USB_C_Receptacle_HRO_TYPE-C-31-M-12 | J3 |
| 1 | REDFIT_SWD_6 | connector_debug:WR-WST REDFIT IDC 6 DBG | J1 |
| 1 | RotaryEncoder_Switch | Rotary_Encoder:RotaryEncoder_Bourns_Horizontal_PEC09-2xxxF-Sxxxx | SW2 |
| 1 | SLP | TestPoint:TestPoint_Plated_Hole_D2.0mm | TP1 |
| 1 | STM32G431CBTx | Package_QFP:LQFP-48_7x7mm_P0.5mm | U4 |
| 1 | Si4162DY | Package_SO:SOIC-8_3.9x4.9mm_P1.27mm | Q1 |
| 1 | Si4825 | Package_SO:SOIC-8_3.9x4.9mm_P1.27mm | Q6 |
| 1 | TCPP01-M12 | Package_DFN_QFN:QFN-12-1EP_3x3mm_P0.51mm_EP1.45x1.45mm | U5 |
| 1 | TLV2333 | Package_SO:SOIC-8_3.9x4.9mm_P1.27mm | U7 |
| 1 | TPS61040DBV | Package_TO_SOT_SMD:SOT-23-5 | U10 |
| 1 | TPS62177DQC | Package_SON:WSON-10-1EP_2x3mm_P0.5mm_EP0.84x2.4mm_ThermalVias | U8 |
| 1 | USBLC6-2SC6 | Package_TO_SOT_SMD:SOT-23-6 | U1 |
| 1 | WSLP2010R0100FEA | Resistor_SMD:R_2010_5025Metric | R27 |
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Questions
How big is the Loeti PCB?
It measures 80 × 50.5 mm and has 4 copper layers, 1.6 mm thick.
What parts does the Loeti use?
110 parts, built around the STM32G431CBT6, TLV2333ID, INA301A1IDGKR and TPS61040DBV. 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 Loeti KiCad files?
From the elagil/loeti repository on GitHub, at the commit this page was made from: the board is hardware/pcbs/main/loeti.kicad_pcb and its schematic hardware/pcbs/ad_fs/ad_fs.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Loeti design in my own project?
Its repository states no licence, so its author keeps all rights: ask elagil before reusing the design.