AT89s51-dev board

21shravan·AT89s51-dev-board

AT89s51-dev board layout, top view — open source board by 21shravan

About the AT89s51-dev board

AT89s51-dev board is an open source PCB design by 21shravan, published on GitHub. It is a 2-layer board measuring 54.5 × 90 mm, with 44 components from 23 distinct parts.

Other key parts include the AT89x51xxP, CH340C and LM7805_TO220. By type, the board carries 13 resistors, 12 capacitors, 7 connectors, 7 diodes, 3 ICs and 1 crystal.

It belongs with the dev boards & breakouts and usb & debug tools designs in this gallery.

From the project

A modern AT89S52 (8051) development board featuring USB Type-C power, CH340C USB-to-UART, ISP programming, and a complete open-source hardware design documented from schematic to PCB.

This project aims to build a modern development board around the AT89S52 microcontroller with features commonly found in commercial development boards while keeping the design simple, educational, and open-source.

Unlike many existing AT89S52 boards, this design integrates USB Type-C power, USB-to-UART communication, and ISP programming support, making it more convenient for modern development.

AT89s51-dev board, from the project README — From the project README

Main components on the AT89s51-dev board

AT89x51xxP CH340C LM7805_TO220

AT89s51-dev board bill of materials (BOM)

44 components, 23 distinct parts.

Qty	Part	Footprint	Refs
1	AT89x51xxP	DIP-40_W15.24mm	U2
1	CH340C	SOIC-16_3.9x9.9mm_P1.27mm	U3
1	LM7805_TO220	TO-220-3_Horizontal_TabDown	U4
1	11.0592Mhz	Crystal_HC49-4H_Vertical	Y1
1	ISP_connector	PinHeader_2x03_P2.54mm_Vertical	J1
1	Screw_Terminal_01x02	PinSocket_1x02_P2.54mm_Horizontal	J2
1	USB_C_Receptacle_USB2.0_16P	USB_C_Receptacle_GCT_USB4105-xx-A_16P_TopMnt_Horizontal	J3
4	Conn_01x08_Pin	PinHeader_1x08_P2.54mm_Vertical	P0, P1, P2, P3
1	SW_Push	SW_PUSH_6mm_H5mm	SW1
1	LED	LED_D3.0mm	D1
2	1N4001	D_DO-41_SOD81_P10.16mm_Horizontal	D2, D3
1	P1.0_LED	LED_D3.0mm	D4
1	PESD5V0L1UL	D_SOD-882	D5
2	SS14	D_SMA	D6, D8
1	0.33uF	C_Disc_D3.0mm_W1.6mm_P2.50mm	C1
4	0.1uF	C_Disc_D3.0mm_W1.6mm_P2.50mm	C2, C3, C7, C8
2	30pF	C_Disc_D3.0mm_W1.6mm_P2.50mm	C4, C5
2	10uF	CP_Radial_D4.0mm_P1.50mm	C6, C12
1	10uF	C_Disc_D3.0mm_W1.6mm_P2.50mm	C9
2	4.7uf	C_Disc_D3.0mm_W1.6mm_P2.50mm	C10, C11

Show 3 more

Qty	Part	Footprint	Refs
2	1k	R_Axial_DIN0204_L3.6mm_D1.6mm_P1.90mm_Vertical	R1, R11
9	10k	R_Axial_DIN0204_L3.6mm_D1.6mm_P1.90mm_Vertical	R2, R3, R4, R5, R6, R7, R8, R9 +1
2	5.1k	R_Axial_DIN0204_L3.6mm_D1.6mm_P1.90mm_Vertical	R12, R13

AT89s51-dev board design files

The KiCad project lives in the 21shravan/AT89s51-dev-board repository on GitHub; these links point at the commit this page was built from.

Layoutdev_board.kicad_pcb
Schematicdev_board.kicad_sch

AT89s51-dev board: common questions

How big is the AT89s51-dev board?

The AT89s51-dev board measures 54.5 × 90 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the AT89s51-dev board?

44 components, from 23 distinct parts. The full bill of materials is listed on this page.

Where can I download the AT89s51-dev board design files?

From the 21shravan/AT89s51-dev-board repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the AT89s51-dev board design in my own project?

The repository has no license, so all rights stay with 21shravan. Use it as a reference, and ask the author before reusing the design.

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