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Topaz

dfedor2008·Topaz

Topaz PCB layout, top view — open source Microchip SAM board by dfedor2008

About the Topaz PCB

Topaz is an open source Microchip SAM PCB design by dfedor2008, published on GitHub. It is a 4-layer board measuring 30.5 × 72.9 mm, with 56 components from 43 distinct parts.

Its main chip is the ATSAMD21G18A-A, from the Microchip SAM family. Other key parts include the PE4259, ECS-327TXO-2012, SX1262IMLTRT, AMS1117-3.3 and BME280. By type, the board carries 22 capacitors, 11 resistors, 7 ICs, 5 inductors, 3 connectors and 3 diodes.

It belongs with the rf & radio, power & battery and sensors designs in this gallery.

From the project

A radio module which can send data through morse code

Topaz is a compact, cost-effective GPS telemetry platform designed for long-range data transmission using LoRa modulation. It supports both Morse code and binary telemetry formats and integrates environmental sensing, making it suitable for high-altitude ballooning, rocket recovery, remote monitoring, and more.

- Microcontroller — ATSAMD21G18A: A reliable, low-power Cortex-M0+ MCU from Microchip. - LoRa Radio — SX1262: Sub-GHz long-range radio for Morse or telemetry data. - GPS Receiver — ATGM336H: Provides position and timing data. - Environmental Sensor — BME280: Measures temperature…

Topaz, from the project README
From the project README

Main components on the Topaz

PE4259ATSAMD21G18A-AECS-327TXO-2012SX1262IMLTRTAMS1117-3.3BME280ATGM336H

Topaz bill of materials (BOM)

56 components, 43 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
PE4259
U1
1
ATSAMD21G18A-A
U2
1
ECS-327TXO-2012
U3
1
SX1262IMLTRT
U4
1
AMS1117-3.3
U5
1
BME280
U6
1
ATGM336H
U7
1
FA-128_32.0000MF20X-K5
Y1
1
USBC
J1
1
POWER IN
J2
1
~
J3
1
1575AT43A0040
AE1
1
0900FM15K0039
FL1
1
Conn_Coaxial
Je2
1
RST
SW1
2
1N4148WT
D1, D2
1
LED
D3
1
15UH
15uH
L1
1
47NH
47nH
L2
1
9.1NH
9.1nH
L3
Show 23 more
QtyPartRefs
2
3.9 nH
L4, L5
1
1UF
1uF
C1
2
100NF
100nF
C2, C22
2
100 nF
C3, C5
1
10 uF
C4
1
4.7 nF
C6
3
1NF
1nF
C7, C12, C13
1
100NF
100nF
C8
1
470NF
470nF
C9
2
47PF
47pF
C10, C11
1
39PF
39pF
C14
2
3.3PF
3.3pF
C15, C16
2
22U
22u
C17, C18
1
1UF
1uF
C19
1
1.5PF
1.5pF
C20
1
10UF
10uF
C21
2
1.8K
1.8k
R1, R2
1
220
R3
1
1M
R4
2
5K1
5k1
R5, R6
2
10K
10k
R7, R8
2
100
R9, R11
1
300
R10

Topaz design files

The KiCad project lives in the dfedor2008/Topaz repository on GitHub; these links point at the commit this page was built from.

Topaz: common questions

What microcontroller does the Topaz use?

The Topaz is built around the ATSAMD21G18A-A, from the Microchip SAM family.

How big is the Topaz PCB?

The Topaz measures 30.5 × 72.9 mm, has 4 copper layers and is 1.22 mm thick.

How many components are on the Topaz?

56 components, from 43 distinct parts, with part numbers taken from the project's own BOM. The full bill of materials is listed on this page.

Where can I download the Topaz design files?

From the dfedor2008/Topaz repository on GitHub, which has the KiCad layout, the schematic and the BOM; the links under Design files point to each one.

Can I use the Topaz design in my own project?

The repository has no license, so all rights stay with dfedor2008. Use it as a reference, and ask the author before reusing the design.

Can I test firmware for the Topaz without the hardware?

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

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