2 layers52.4 × 33 mm 003Clock, the printed circuit board in 3D

003Clock

Nuvoton N76E003 / N76S003 MCU digital clock kit.

Size: 52.4 × 33 mm
Copper layers: 2
Thickness: 1.6 mm
Parts: 23
Nets: 30
Pads: 100
Tracks, vias: 163, 94
Pours: 1
Routed: Yes
KiCad: KiCad 6 (file 20211014)
Created: 5 Dec 2024
Updated: 20 Oct 2026

Overview

003Clock is an open-source printed circuit board by danchouzhou, from the danchouzhou/003Clock repository on GitHub. It is a 2-layer board of 52.4 × 33 mm with 23 parts on 30 nets, routed with 163 tracks and 94 vias.

It is built around the N76E003AT20 and AZ23C3V3. Its parts include 6 resistors, 4 connectors, 2 capacitors, 2 ICs and 1 diode. It belongs with the 8051 (CH55x, STC, AT89) boards of this library.

Main components

README

README.md

003Clock

Usage

To clone this project

This project work with submodule from Nuvoton corporation. You need to initialize submodules by passing --recurse-submodules to the git clone command.

text

git clone https://github.com/danchouzhou/003Clock.git --recurse-submodules

Build tools

Please make sure the installation path is the same as the one in setting.json.

Build the firmware

text

cd firmware/003Clock

Simply ./build.bat. main.bin should be inside the Objects folder.

text

./build.bat

Flash the firmware by Nu-Link programmer (ICP)

text

./flash.bat

Flash the firmware without a Nu-Link programmer (ISP)

Download the NuMicro ISP Programming Tool
Connect USB-UART adapter to PC
Select the COM port and then press connect
Connect the target device to the USB-UART adapter, ISP Tool should show connected
Select APROM file and check APROM and Reset and Run, then press Start

Parts

Qty	Value	Footprint	References
4	MountingHole	MountingHole:MountingHole_3.2mm_M3_ISO14580	H1, H2, H3, H4
3	5.1K	Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder	R1, R2, R3
2	1uF	Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder	C1, C2
2	47R	Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder	R5, R6
1	1.5K	Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder	R4
1	2137160001	2137160001:2137160001	J2
1	AZ23C3V3	Package_TO_SOT_SMD:SOT-23-3	D1
1	Conn_01x03	Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_Vertical	J4
1	Conn_01x05	Connector_PinHeader_2.54mm:PinHeader_1x05_P2.54mm_Vertical	J3
1	Conn_01x11	Connector_PinHeader_2.54mm:PinHeader_1x11_P2.54mm_Vertical	J1
1	FerriteBead_Small	Inductor_SMD:L_0805_2012Metric_Pad1.05x1.20mm_HandSolder	FB1
1	LGC-12002	LGC-12002:LGC-12002	U2
1	N76E003AT20	Package_SO:TSSOP-20_4.4x6.5mm_P0.65mm	U1
1	SG-5032CCN	Oscillator:Oscillator_SMD_SeikoEpson_SG8002LB-4Pin_5.0x3.2mm	X1
1	SW_Push	Button_Switch_THT:SW_PUSH_6mm	SW1
1	SolderJumper_2_Open	Jumper:SolderJumper-2_P1.3mm_Open_Pad1.0x1.5mm	JP1

Questions

How big is the 003Clock PCB?

It measures 52.4 × 33 mm and has 2 copper layers, 1.6 mm thick.

What parts does the 003Clock use?

23 parts, built around the N76E003AT20 and AZ23C3V3. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.

Where can I download the 003Clock KiCad files?

From the danchouzhou/003Clock repository on GitHub, at the commit this page was made from: the board is kicad/003Clock.kicad_pcb and its schematic kicad/003Clock.kicad_sch. PCBKit opens the board in the browser, with nothing to install.

Can I use the 003Clock design in my own project?

Its repository states no licence, so its author keeps all rights: ask danchouzhou before reusing the design.

Category and platform

8051 (CH55x, STC, AT89)

Project files

Show this board on your page

A live frame, for any web page

<iframe src="https://pcbkit.io/embed/boards/danchouzhou-003clock" title="003Clock in PCBKit" width="100%" height="480" style="border:0;border-radius:12px" allow="fullscreen" loading="lazy"></iframe>

A picture

<img src="https://pcbkit.io/embed/boards/danchouzhou-003clock.jpg" alt="003Clock" width="1200" height="900">

A picture that opens the board, for a README

[![003Clock](https://pcbkit.io/embed/boards/danchouzhou-003clock.jpg?size=s)](https://pcbkit.io/boards/danchouzhou-003clock)

Source

Repository: danchouzhou/003Clock
Board file: kicad/003Clock.kicad_pcb
Commit: 3be4574
Homepage: forum.nuvoton.com/en/numicro-8051-mcu/hardware/14372
Licence: Not stated

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