HardLabs

WT-220 RPi Hat and Rear IO

tuna-f1sh·whitterm-wt220·whitterm-hat/whitterm-hat.kicad_pcb

WT-220 RPi Hat and Rear IO layout, top view — open source Microchip SAM board by tuna-f1sh

About the WT-220 RPi Hat and Rear IO

WT-220 RPi Hat and Rear IO is an open source Microchip SAM PCB design by tuna-f1sh, published on GitHub under the GPL-3.0 license. It is a 2-layer board measuring 173.5 × 85 mm, with 152 components from 61 distinct parts.

Its main chip is the SAMD21G18A, from the Microchip SAM family. Other key parts include the TUSB320, CAT24C32WI-GT3, 74LVC1G17, MAX3221 and 74LVC2G02. By type, the board carries 67 resistors, 24 diodes, 23 capacitors, 12 transistors, 10 ICs and 9 connectors.

It belongs with the dev boards & breakouts, retro computing and power & battery designs in this gallery.

From the project

Design files, firmware and linux scripts for my /clever/ serial terminal, the Whitterm-220 - WT-220.

Design files, firmware and linux scripts for my clever serial terminal, the Whitterm-220 - WT-220.

The WT-220 is a homage to the VT-220, providing a physical RS232 terminal with the full features of a Linux computer running on a Raspberry Pi.

KiCad design files for the rear io-panel:

USB-C input for USB-PD high current (3 A) supply to RPi. LEDs indicate detected current profile from UFP. I2C lines made available to SAMD for playing with USB-C device modes. MAX3232 RS232 transceiver provides RS232 level interface to RPi UART and SAMD UART. SAMD21 microcontroller provides boot button control…

WT-220 RPi Hat and Rear IO, from the project README
From the project README

Main components on the WT-220 RPi Hat and Rear IO

SAMD21G18ATUSB320CAT24C32WI-GT374LVC1G17MAX322174LVC2G02MCP1703A-3302_SOT23ADA4807-2ARM

WT-220 RPi Hat and Rear IO bill of materials (BOM)

152 components, 61 distinct parts.

QtyPartRefs
1
SAMD21G18A
IC1
1
TUSB320
U1
1
CAT24C32WI-GT3
U2
2
74LVC1G17
U3, U4
1
MAX3221
U5
1
74LVC2G02
U6
1
MCP1703A-3302_SOT23
U7
2
ADA4807-2ARM
U10, U11
5
IRLML6402PBF
Q1, Q2, Q7, Q8, Q9
7
BC850
Q3, Q4, Q5, Q6, Q10, Q11, Q12
1
32.768
Y1
1
USB_C_Receptacle
J1
1
Touch I2C
J2
1
40HAT
J3
1
Conn_02x05_Odd_Even
J5
3
Conn_01x04_Female
J6, J7, J10
1
Conn_01x10_Female
J8
1
CONN_01X02
J9
1
SW_DIP_x06
SW1
1
SW_Push
SW2
Show 41 more
QtyPartRefs
1
RXD
URX1
1
TXD
UTX1
1
PRTR5V0U2X
D1
1
OUT2
D2
1
OUT1
D3
1
TLRX
D4
1
TLTX
D5
1
RXD
D6
1
TXD
D7
1
LM285D-2.5G
D8
6
SMAJ30A-TR
D9, D10, D18, D19, D20, D21
1
D13
D11
2
MMSZ16T1G
D12, D13
2
BZX84C10LT1G
D14, D15
2
BAV99
D16, D17
2
KP-2012MGC
D22, D23
1
SMAJ12A-TR
D24
1
LM18P
L1
1
Ferrite_Bead_Small
L2
1
47nF
C1
3
330nF
C2, C3, C4
6
100nF
C5, C6, C18, C19, C20, C21
1
1uF
C7
5
0.1uF
C8, C10, C13, C14, C15
2
15pF
C9, C12
1
0.01uF
C11
2
10uF
C16, C17
1
470pF
C22
1
10pF
C23
1
900k
R1
15
10K
R2, R5, R17, R20, R21, R24, R25, R29 +7
2
0R
R3, R4
6
4.7K
R6, R8, R10, R12, R47, R48
10
150R
R7, R9, R18, R19, R22, R23, R26, R27 +2
1
DNP
R11
2
100k
R13, R14
16
470R
R15, R40, R42, R43, R45, R46, R49, R50 +8
9
1k
R16, R38, R39, R41, R44, R51, R61, R62 +1
2
9k1
R34, R35
2
3k9
R36, R37
1
220R
R58

WT-220 RPi Hat and Rear IO design files

The KiCad project lives in the tuna-f1sh/whitterm-wt220 repository on GitHub; these links point at the commit this page was built from.

WT-220 RPi Hat and Rear IO: common questions

What microcontroller does the WT-220 RPi Hat and Rear IO use?

The WT-220 RPi Hat and Rear IO is built around the SAMD21G18A, from the Microchip SAM family.

How big is the WT-220 RPi Hat and Rear IO?

The WT-220 RPi Hat and Rear IO measures 173.5 × 85 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the WT-220 RPi Hat and Rear IO?

152 components, from 61 distinct parts. The full bill of materials is listed on this page.

Where can I download the WT-220 RPi Hat and Rear IO design files?

From the tuna-f1sh/whitterm-wt220 repository on GitHub, which has the KiCad layout; the links under Design files point to each one.

Can I use the WT-220 RPi Hat and Rear IO design in my own project?

Yes, under the terms of its GPL-3.0 license, which tuna-f1sh chose for the repository.

Can I test firmware for the WT-220 RPi Hat and Rear IO 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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