2 layers64 × 55 mm
2 layers61.3 × 30 mm
Utherm
mdavidsaver/pcbEE fumblings
- Size
- 61.3 × 30 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 30
- Nets
- 36
- Pads
- 133
- Tracks, vias
- 226, 18
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 4
- Created
- 18 Jul 2016
- Updated
- 23 Aug 2017
Overview
Utherm is an open-source printed circuit board by mdavidsaver, from the mdavidsaver/pcb repository on GitHub. It is a 2-layer board of 61.3 × 30 mm with 30 parts on 36 nets, routed with 226 tracks and 18 vias.
It is built around the ATMEGA16U4-AU and LM358. Its parts include 10 resistors, 2 capacitors, 1 IC, 1 connector and 1 switch. It belongs with the AVR (ATmega, ATtiny) boards of this library.
Main components
2
ATMEGA16U4-AU
TQFP-44(10x10)-40℃~+85℃ 1.25KB 10bit 16KB 16MHz 2.7V~5.5V 26 512Byte 8 Bit AVR Built-in FLASH TQFP-44(10x10) Microcontrollers (MCU/MPU/SOC) ROHSMicrochip TechnologyMicrocontrollers (MCU/MPU/SOC)
LM358
SOP-8-18V~18V 0℃~+70℃ 1.2MHz 10nA 2 24mA 3V~36V 500uA 50nA 5mV 80dB Built-in compensation SOP-8 Operational Amplifier ROHSMSKSEMIOperational Amplifier
README
icetest/README.mdArduino Shield w/ iCE40 FPGA
State: Rev 2 tested
Erratta for rev. 2
- Add pull-up on SS
- LP filter/ isolation on SPI line (noticable cross-talk)
ice40 chip used with 3.3V I/O pins and 1.2V core. Chip is not 5V tolerant.
The logic level shifter chips have both 5V and 3.3V. The TI 74LVC chips require that VCCA by power up before, or with, VCCB.
All level shifters VCCA==3.3, VCCB==5
Strictly speaking level shifters not needed for 3.3V -> 5V.
Parts
30| Qty | Value | Footprint | References |
|---|---|---|---|
| 6 | 1k | Resistors_SMD:R_0603_HandSoldering | R3, R4, R5, R6, R7, R8 |
| 4 | 0 | Resistors_SMD:R_0603_HandSoldering | R1, R2, R9, R10 |
| 3 | 100n | Capacitors_SMD:C_0603_HandSoldering | CD1, CD2, CD3 |
| 2 | 1u | Capacitors_SMD:C_0603_HandSoldering | C3, C4 |
| 2 | 22 | Resistors_SMD:R_0603_HandSoldering | RB1, RB2 |
| 2 | LM358 | local:SO8_6mm | A1, A2 |
| 2 | THERM | Terminal_Blocks:TerminalBlock_Pheonix_MKDS1.5-2pol | T1, T2 |
| 1 | 500m | Resistors_SMD:R_1218_HandSoldering | F1 |
| 1 | ADC0 | Measurement_Points:Measurement_Point_Square-SMD-Pad_Small | W1 |
| 1 | ADC1 | Measurement_Points:Measurement_Point_Square-SMD-Pad_Small | W2 |
| 1 | ATMEGA16U4-A | local:TQFP44 | U1 |
| 1 | I/O | Pin_Headers:Pin_Header_Straight_2x04 | P1 |
| 1 | ISP | Pin_Headers:Pin_Header_Straight_2x03 | ISP1 |
| 1 | USB_B | local:USB_B_micro | USB1 |
| 1 | XLR3 | TO_SOT_Packages_THT:TO-92_Molded_Narrow | K1 |
| 1 | resonator-3 | local:resonator-3 | X1 |
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Questions
How big is the Utherm PCB?
It measures 61.3 × 30 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Utherm use?
30 parts, built around the ATMEGA16U4-AU and LM358. 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 Utherm KiCad files?
From the mdavidsaver/pcb repository on GitHub, at the commit this page was made from: the board is utherm/utherm.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the Utherm design in my own project?
Its repository states no licence, so its author keeps all rights: ask mdavidsaver before reusing the design.