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PCB updi unbricker

k-takata·PCB_updi_unbricker

PCB updi unbricker layout, top view — open source AVR/Arduino board by k-takata

About the PCB updi unbricker

PCB updi unbricker is an open source AVR/Arduino PCB design by k-takata, published on GitHub. It is a 2-layer board measuring 54 × 47.5 mm, with 65 components from 42 distinct parts.

Its main chip is the ATtiny402-SS, from the AVR/Arduino family. Other key parts include the CH340K, LM1117GS-3.3 and MT3608. By type, the board carries 18 resistors, 13 diodes, 8 transistors, 7 connectors, 6 capacitors and 4 ICs.

It belongs with the usb & debug tools designs in this gallery.

From the project

UPDI High Voltage programmer for AVR Dx/Ex and ATtiny series

This board is a UPDI programmer for AVR DA, DB, DD, DU, EA, and EB-series 7.5 V high-voltage (HV) programming and modern ATtiny-series (tinyAVR 0/1/2) 12 V HV programming. It injects HV pulses to restore programming capability when the UPDI pin has been accidentally or deliberately reconfigured, preventing normal UPDI programming with a standard UPDI tool.

The UPDI section of the circuit uses the design from UPDI Adapter for AE-CH9102F (Rev. 2), and it includes an automatic mode switch controlled by the RTS signal.

PCB updi unbricker, from the project README
From the project README

Main components on the PCB updi unbricker

CH340KLM1117GS-3.3ATtiny402-SSMT3608

PCB updi unbricker bill of materials (BOM)

65 components, 42 distinct parts.

QtyPartRefs
1
CH340K
U1
1
LM1117GS-3.3
U2
1
ATtiny402-SS
U4
1
MT3608
U5
4
BSS138
Q1, Q3, Q6, Q8
3
BSS84
Q2, Q5, Q7
1
AO3401A
Q4
1
USB_C_Receptacle_USB2.0_16P
J1
1
Target
J2
1
TTL Serial
J3
1
RTS / DTR
J4
1
UPDI_TINY
J5
1
UPDI_DxEx
J6
1
UPDI_FW
J7
1
0.5 A
F1
1
HV
SW1
1
VDD
SW2
1
Power
SW3
1
START
SW4
3
~
TP1, TP2, TP3
Show 22 more
QtyPartRefs
5
BAT43WS
D1, D3, D4, D5, D6
1
BZT52C5V6
D2
1
BZT52C3V6
D7
1
NCD0805R1
D8
1
KT-0805G
D9
1
BZT52C7V5
D10
1
5.6V
D11
1
3.6V
D12
1
7.5V
D13
1
4.7μ
L1
2
10μ
C1, C2
2
0.1μ
C3, C6
2
22μ
C4, C5
2
470
R1, R15
2
5.1k
R2, R3
3
100k
R4, R17, R19
2
220
R5, R13
5
10k
R7, R8, R16, R18, R20
1
390k 1%
R10
1
75k 1%
R11
1
3.3k 1%
R12
1
12k
R14

PCB updi unbricker design files

The KiCad project lives in the k-takata/PCB_updi_unbricker repository on GitHub; these links point at the commit this page was built from.

PCB updi unbricker: common questions

What microcontroller does the PCB updi unbricker use?

The PCB updi unbricker is built around the ATtiny402-SS, from the AVR/Arduino family.

How big is the PCB updi unbricker?

The PCB updi unbricker measures 54 × 47.5 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the PCB updi unbricker?

65 components, from 42 distinct parts. The full bill of materials is listed on this page.

Where can I download the PCB updi unbricker design files?

From the k-takata/PCB_updi_unbricker repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the PCB updi unbricker design in my own project?

The repository has no license, so all rights stay with k-takata. Use it as a reference, and ask the author before reusing the design.

Can I test firmware for the PCB updi unbricker without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug AVR/Arduino firmware against it before you order a PCB.

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