HardLabs

MOBO SMD

lkesteloot·alice·alice3/kicad/MOBO_SMD/MOBO_SMD.kicad_pcb

MOBO SMD PCB layout, top view — open source STM32 board by lkesteloot

About the MOBO SMD PCB

MOBO SMD is an open source STM32 PCB design by lkesteloot, published on GitHub under the Apache-2.0 license. It is a 2-layer board measuring 90.2 × 48.3 mm, with 64 components from 34 distinct parts.

Its main chip is the STM32F415RG, from the STM32 family. Other key parts include the Z80CPU-SMD, Propeller_P8X32A-Q44, 24LC256, Propeller_Plug and LD29080DT33R. By type, the board carries 23 resistors, 17 capacitors, 6 ICs, 5 connectors, 3 crystals and 3 switches.

From the project

Website documenting a hardware project from the 1990s.

This is the third model of the Alice machine. It runs a silicon Z80 with two co-processors: an ARM for keyboard, disk, and serial port, and a Propeller for video.

The 80MHz Propeller has 48K of internal RAM, drives VGA and the 5-pin Aux connector (intended for audio but wired generically to 3 Propeller pins) and thus provides opportunities for video and other experimentation.

MOBO SMD, from the project README
From the project README

Main components on the MOBO SMD

Z80CPU-SMDPropeller_P8X32A-Q4424LC256Propeller_PlugSTM32F415RGLD29080DT33R

MOBO SMD bill of materials (BOM)

64 components, 34 distinct parts.

QtyPartRefs
1
Z80CPU-SMD
U1
1
Propeller_P8X32A-Q44
U2
1
24LC256
U3
1
Propeller_Plug
U4
1
STM32F415RG
U5
1
LD29080DT33R
U8
1
MINI_DIN_6
X1
1
5 MHz
Y1
1
16MHz
Y2
1
MicroSD
CON1
1
VGA
J1
1
CONN_01X05
P1
1
USB_OTG
P2
1
UART1
P3
1
F_Small
F1
4
1pin
HOLE0, HOLE1, HOLE2, HOLE3
1
RESET
SW1
1
SOFT RESET
SW2
1
FLASH ARM
SW3
1
DEBUG LED
D1
Show 14 more
QtyPartRefs
1
POWER
D2
2
0.1 µF
C1, C16
6
100nF
C2, C3, C4, C7, C8, C9
2
22pF
C5, C6
2
2.2µF
C10, C11
3
10µF
C14, C19, C20
1
1µ
C21
1
4.7µ
C22
6
10k
R1, R2, R3, R11, R22, R23
1
220
R4
4
100
R5, R12, R24, R25
4
68K
R6, R7, R8, R9
5
240
R14, R16, R18, R20, R21
3
470
R15, R17, R19

MOBO SMD design files

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

MOBO SMD: common questions

What microcontroller does the MOBO SMD use?

The MOBO SMD is built around the STM32F415RG, from the STM32 family.

How big is the MOBO SMD PCB?

The MOBO SMD measures 90.2 × 48.3 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the MOBO SMD?

64 components, from 34 distinct parts. The full bill of materials is listed on this page.

Where can I download the MOBO SMD design files?

From the lkesteloot/alice repository on GitHub, which has the KiCad layout; the links under Design files point to each one.

Can I use the MOBO SMD design in my own project?

Yes, under the terms of its Apache-2.0 license, which lkesteloot chose for the repository.

Can I test firmware for the MOBO SMD without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug STM32 firmware against it before you order a PCB.

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