HardLabs

Back prototype

libresmartphone·libresmartphone·Other_projects/Zerophone-PCB/back_pcb/back_prototype.kicad_pcb

Back prototype PCB layout, top view — open source AVR/Arduino board by libresmartphone

About the Back prototype PCB

Back prototype is an open source AVR/Arduino PCB design by libresmartphone, published on GitHub. It is a 2-layer board measuring 40 × 100 mm, with 65 components from 33 distinct parts.

Its main chip is the ATMEGA_HEADER, from the AVR/Arduino family. Other key parts include the OMAP3530DCBB, TPS65950BZXNR, SN74AVCA406LZXYR, USB3322C-GL and WG7210-00. By type, the board carries 21 capacitors, 12 jumpers, 10 connectors, 9 resistors, 6 ICs and 3 transistors.

It belongs with the audio and displays & leds designs in this gallery.

From the project

This page contains the software used in the open hardware smartphone (libresmartphone)

This is gamma version. It's WIP and is going to be sent to production soon (as soon as last TODOs are finished). You can already order this board, but it's possible the I2C GPIO expander pin mapping is going to change. Also, before ordering, please make sure the Gerber files are recent (if they're up-to-date after latest commits concerning PCB files) and regenerate them if necessary.

Main components on the Back prototype

OMAP3530DCBBTPS65950BZXNRSN74AVCA406LZXYRUSB3322C-GLWG7210-00DC_DC_BREAKOUT

Back prototype bill of materials (BOM)

65 components, 33 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
OMAP3530DCBB
PI ZERO
Texas Instruments Inc.
U1
1
TPS65950BZXNR
SIM800_BREAKOUT
Texas Instruments Inc.
U2
1
SN74AVCA406LZXYR
MCP23017
Texas Instruments Inc.
U3
1
USB3322C-GL
TP4056_BREAKOUT
SMSC
U4
1
WG7210-00
RTC
Jorjin Technologies Inc.
U5
1
DC_DC_BREAKOUT
Texas Instruments Inc.
U6
2
FDJ1027P
IRLML6401
Fairchild Semiconductor
Q1, Q2
1
IRLML6401
Q4
1
32.768Hz
Y1
1
EXPANSION_LEFT
P1
1
EXPANSION_BOTTOM
P2
1
EXPANSION_TOP
P3
2
USB_A
P4, P9
1
AUDIO_CONN
P5
1
ATMEGA_HEADER
P6
1
EXPANSION_BOTTOM2
P7
1
JST
P8
1
CONN_01X08
P10
2
JUMPER
JP1, JP5
3
JUMPER
JP2, JP11, JP12
Show 13 more
QtyPartRefs
1
A0
JP3
1
A1
JP4
2
A2
JP6, JP8
3
Jumper_NC_Small
JP7, JP9, JP10
1
SW_PUSH
SW1
1
ZHCS400TA
SS14
Zetex
D1
1
PGB0010603MR
Led_RGB_CA_CC
Littelfuse
D3
9
100nF
C1, C2, C5, C6, C8, C13, C14, C15 +1
3
100uF
C3, C4, C7
6
10pF
C16, C17, C18, C19, C20, C21
3
33pF
C22, C23, C24
6
10K
R1, R2, R3, R4, R10, R11
3
1K
R5, R6, R7

Back prototype design files

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

Back prototype: common questions

What microcontroller does the Back prototype use?

The Back prototype is built around the ATMEGA_HEADER, from the AVR/Arduino family.

How big is the Back prototype PCB?

The Back prototype measures 40 × 100 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Back prototype?

65 components, from 33 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 Back prototype design files?

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

Can I use the Back prototype design in my own project?

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

Can I test firmware for the Back prototype 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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