USBug

"From idea to fulfillment."

Device Overview

The USBug is a complete USB-based microcontroller development system in a very small footprint.

Programming is done via the USB port. No special programmer device is needed, only a standard “Mini-B” USB cable and a Windows/Linux PC or a Macintosh host computer with a USB port are required.

Key Features:

Fully Open-Source Hardware & Software (CC-BY-SA, GPL)
Drag & Drop firmware: just use it as an USB Memory Stick!
No Loader application, the bootloader resides in ROM (unereasable and does not require precious Flash space)
Works with Mac OS X, Linux & Windows
SWD/JTAG connector (0.5 mil/1.27 mm pitch, standard SWD/JTAG connector)
NXP's LPC ARM Cortex M0/M3 32-bit processor:
- LQFP 48 pin package
- up to 72 MHz CPU frequency
- up to 64 kB of Flash memory
- up to 12 kB of SRAM memory
- Up to 40 GPIO pins
- 1×USB device controller + PHY
- 1×UART interface
- 1×I²C interface
- Up to 2×SSP/SPI interfaces
- 2×32-bit timers
- 2×16-bit timers
- 1×Watchdog timer
- 1×SysTick timer
- 10 Bit ADC with up to 8 inputs
Tiny size: 50 mm × 20 mm (2" × 0.8"), only 6.2 mm (0.244"") thick (w/o header pins)
Available with pins for solderless breadboard
Very low cost

Documentation & Resources

Support Site

As a fully "Open Hardware" project, all design documents are made available in the USBug Github repository.

Make sure you also visit the corresponding Wiki where you will find the most up-to-date information on the project.

Schematic

The schematic can be downloaded in EagleCAD or PDF format from the Github repository.

Layout

The board layout can be downloaded in EagleCAD format from the Github repository.

PCB

All Gerber RS274D files for PCB manufacturing are available from the Github repository.

3D Model

The Sketchup 3D Model can be downloaded from the 3D WareHouse.

Pictures

Videos

Bill Of Materials

Qty	Value	Device	Parts	Supplier	Supplier Part Number	Manufacturer	Manufacturer Part Number	Description
1	1M	RES_0603	R12	DigiKey	P1.0MGCT-ND	Panasonic - ECG	ERJ-3GEYJ105V	RES 1.0M OHM 1/10W 5% 0603 SMD
2	1k	RES_0603	R4, R9	DigiKey	P1.0KGCT-ND	Panasonic - ECG	ERJ-3GEYJ102V	RES 1.0K OHM 1/10W 5% 0603 SMD
1	1k5	RES_0603	R7	DigiKey	P1.5KGCT-ND	Panasonic - ECG	ERJ-3GEYJ152V	RES 1.5K OHM 1/10W 5% 0603 SMD
1	1u/16V	CAP_0603	C2	DigiKey	587-1241-1-ND	Taiyo Yuden	EMK107B7105KA-T	CAP CER 1UF 16V 10% X7R 0603
1	2u2/10V	CAP_0603	C3	DigiKey	587-2983-1-ND	Taiyo Yuden	LMK107B7225KA-T	CAP CER 2.2UF 10V 10% X7R 0603
1	10k	RES_0603	R3	DigiKey	P10KGCT-ND	Panasonic - ECG	ERJ-3GEYJ103V	RES 10K OHM 1/10W 5% 0603 SMD
2	10n	CAP_0603	C7, C10	DigiKey	445-6855-1-ND	TDK Corporation	C1608X7R1C103K	CAP CER 10000PF 16V 10% X7R 0603
1	10n/500V	CAP_1206	C8	DigiKey	709-1027-1-ND	Johanson Dielectrics Inc	501R18W103KV4E	CAP CER 10000PF 500V X7R 1206
1	12MHz	CRYSTAL_50X32	Y1	DigiKey	644-1034-1-ND	NDK	NX5032GA-12.000000MHZ-LN-CD-1	CRYSTAL 12.000000 MHZ 8PF SMD
2	18p/50V	CAP_0603	C4, C5	DigiKey	445-1272-1-ND	TDK Corporation	C1608C0G1H180J	CAP CER 18PF 50V 5% NP0 0603
2	20K	RES_0603	R1, R2	DigiKey	P20KGCT-ND	Panasonic - ECG	ERJ-3GEYJ203V	RES 20K OHM 1/10W 5% 0603 SMD
2	33R	RES_0603	R10, R11	DigiKey	P33GCT-ND	Panasonic - ECG	ERJ-3GEYJ330V	RES 33 OHM 1/10W 5% 0603 SMD
1	100k	RES_0603	R5	DigiKey	P100KGCT-ND	Panasonic - ECG	ERJ-3GEYJ104V	RES 100K OHM 1/10W 5% 0603 SMD
3	100n	CAP_0603	C1, C6, C9	DigiKey	478-1239-1-ND	AVX Corporation	0603YC104KAT2A	CAP CER 0.1UF 16V 10% X7R 0603
2	150R	RES_0603	R6, R8	DigiKey	P150GCT-ND	Panasonic - ECG	ERJ-3GEYJ151V	RES 150 OHM 1/10W 5% 0603 SMD
1	BAT54C	BAT54C	D1	DigiKey	BAT54C-FDICT-ND	Diodes Inc	BAT54C-7-F	DIODE SCHOTTKY DUAL 30V SOT23-3
1	BLM18EG601SN1D	FERRITE_BEAD0603	L1	DigiKey	490-3994-1-ND	Murata Electronics North America	BLM18EG601SN1D	FILTER CHIP 600 OHM 500MA 0603
1	BSS84-7-F	BSS84-7-F	Q1	DigiKey	BSS84-FDICT-ND	Diodes Inc	BSS84-7-F	MOSFET P-CH 50V 130MA SOT23-3
1	FTSH-105-01-L-DH	FTSH-105-01-L-DH	P1	DigiKey	SAM1160-05-ND	Samtec Inc	FTSH-105-01-L-DH	CONN HEADR 10POS DL .05″ R/A SMD
1	ISP	SPST_SWITCH	S2	DigiKey	679-2307-1-ND	APEM Components, LLC	ADTSM32RVTR	SWITCH TACTILE SPST-NO 0.05A 12V
1	LEFT	HEADER_1X20_LOCK	P2	DigiKey	WM6420-ND	Molex Connector Corporation	22-28-4200	CONN HEADER 20POS .100 VERT TIN
1	LPC1343FBD48	LPC1343FBD48	U1	DigiKey	568-4945-ND	NXP Semiconductors	LPC1343FBD48,151	IC MCU 32BIT 32KB FLASH 48LQFP
1	MIC5225-3.3YM5	MIC5225-3.3YM5	VR1	DigiKey	576-2980-1-ND	Micrel Inc	MIC5225-3.3YM5 TR	IC REG 3.3V SOT23-5
1	MINI-B USB	MINI-B_USBUX60-MB-5ST	J1	DigiKey	H2959CT-ND	Hirose Electric Co Ltd	UX60-MB-5ST	CONN RECEPT MINI USB2.0 5POS
1	POWER	LED_0805	D2	DigiKey	350-2038-1-ND	Dialight	598-8110-107F	LED TOPLED LED ALINGAP RED CLEAR 0805 SMD
1	PRTR5V0U2X	PRTR5V0U2X	D5	DigiKey	568-4140-1-ND	NXP Semiconductors	PRTR5V0U2X,215	DIODE ESD PROTECTION SOT143B
1	RESET	SPST_SWITCH	S1	DigiKey	679-2307-1-ND	APEM Components, LLC	ADTSM32RVTR	SWITCH TACTILE SPST-NO 0.05A 12V
1	RIGHT	HEADER_1X20_LOCK	P3	DigiKey	WM6420-ND	Molex Connector Corporation	22-28-4200	CONN HEADER 20POS .100 VERT TIN
1	USB	LED_0805	D3	DigiKey	350-2032-1-ND	Dialight	598-8140-107F	LED ALINGAP YLW CLEAR 0805 SMD
1	USER	LED_0805	D4	DigiKey	350-2035-1-ND	Dialight	598-8170-107F	LED ALINGAP GREEN CLEAR 0805 SMD
Qty	Value	Device	Parts	Supplier	Supplier Part Number	Manufacturer	Manufacturer Part Number	Description

Datasheets

NXP's LPC USB ARM Cortex M0/M3 Microcontrollers

Today, 32-bit microncontrollers are outperforming older 8-bit microcontrollers, both in terms of performance, but also in terms of price. Thanks to the ever finer silicon etching capabilities, it is now possible to put more transisors on the same surface, allowing for wider data paths and more complex architectures at a competitive price and comparable power consumption.

Among all 32-bit architectures, ARM Ltd. has clearly one of the leading solution with its low-power "Cortex M" CPU core design. This very energy and size-efficient IP (Intellectual Property) has been adopted by most of the microcontroller manufacturers and has become the de facto standard for embedded 32-bit microcontroller CPU cores.

But beside the CPU core itself, the microcontrollers implementing the ARM Cortex-M architecture also provide more sophisticated peripherals, compared to 8-bit units. Usually, a USB device is integrated in most mid-range devices, while USB host and Ethernet is only available on the higher-end devices.

As a major semiconductor manufacturer, NXP has a large selection of ARM Cortex-M-based devices, among which the upper low-range LPC11Uxx and mid-range LPC13xx devices integrates an USB device interface. But compared to other similar devices, these chips have a unique ROM-based MSC ("Mass Storage Class", aka. "USB memory stick") USB bootloader, which is the main reason for choosing them for the USBug board.

The second reason to choose these USB-èenabled LPCxxxx for the USBug is that the devices using the LQFP48 package are pin-to-pin compatible, so here are all the CPUs that are compatible with the USBug board:

Group	Function	LPC11U23	LPC11U24	LPC1342	LPC1343	LPC1345	LPC1346	LPC1347
Analog	ADC Channels/Resolution	8×10-bit, 400 kSamples/s	8×10-bit, 400 kSamples/s	8×10-bit, 400 kSamples/s	8×10-bit, 400 kSamples/s	8×12-bit, 500 kSamples/s	8×12-bit, 500 kSamples/s	8×12-bit, 500 kSamples/s
Clock	Wakeup from Deep-Sleep/Power-Down	GPIO, WDT, USB	GPIO, WDT, USB	GPIO, WDT Oscillator	GPIO, WDT Oscillator	GPIO, WDT, USB	GPIO, WDT, USB	GPIO, WDT, USB
Core	CPU	ARM Cortex-M0 r0p0	ARM Cortex-M0 r0p0	ARM Cortex-M3 r2p0	ARM Cortex-M3 r2p0	ARM Cortex-M3 r2p1	ARM Cortex-M3 r2p1	ARM Cortex-M3 r2p1
Core	Processor Speed	50 MHz	50 MHz	72 MHz	72 MHz	72 MHz	72 MHz	72 MHz
Core	SysTick Timer	1	1	1	1	1	1	1
Core	Bit-banding	yes	yes	yes	yes	yes	yes	yes
Core	Memory Protection Unit	no	no	no	no	no	no	no
Debug	Debug Interfaces	JTAG/SWD	JTAG/SWD	SWD	SWD	JTAG/SWD	JTAG/SWD	JTAG/SWD
GPIOs	GPIO Blocks	2×32 pins	2×32 pins	4×12 pins	4×12 pins	2×32 pins	2×32 pins	2×32 pins
GPIOs	I/O Pins	40	40	40	40	40	40	40
Memory	Flash	24 kB	32 kB	16 kB	32 kB	32 kB	48 kB	64 kB
Memory	SRAM	6/8+2 kB	6/8+2 kB	4 kB	8 kB	8+2 kB	8+2 kB	8+2+2 kB
Memory	ROM	16 kB	16 kB	16 kB	16 kB	16 kB	16 kB	16 kB
Memory	EEPROM	1 kB	2/4 kB	-	-	2 kB	4 kB	4 kB
Packaging	Available Packages	QFP64, QFP48, QFN33	QFP64, QFP48, QFN33	QFP48,QFN33	QFP48,QFN33	QFP64, QFP48, QFN33	QFP64, QFP48, QFN33	QFP64, QFP48, QFN33
Serial Interfaces	UART Blocks	1	1	1	1	1	1	1
Serial Interfaces	I²C Blocks	1	1	1	1	1	1	1
Serial Interfaces	SSP/SPI Blocks	2	2	1	1	2	2	2
Timers	32-bit Timer Blocks	2	2	2	2	2	2	2
Timers	16-bit Timer Blocks	2	2	2	2	2	2	2
Timers	Watchog Timer Blocks	1 (Windowed)	1 (Windowed)	1	1	1 (Windowed)	1 (Windowed)	1 (Windowed)
Timers	PWM Channels	11	11	11	11	11	11	11
USB Interface	USB Blocks	1 USB 2.0 FS Device + PHY	1 USB 2.0 FS Device + PHY	1 USB 2.0 FS Device + PHY	1 USB 2.0 FS Device + PHY	1 USB 2.0 FS Device + PHY	1 USB 2.0 FS Device + PHY	1 USB 2.0 FS Device + PHY
USB Interface	USB ROM-based drivers	HID, MSC, CDC	HID, MSC, CDC	HID, MSC	HID, MSC	HID, MSC, CDC, FDU	HID, MSC, CDC, FDU	HID, MSC, CDC, FDU
Group	Function	LPC11U23	LPC11U24	LPC1342	LPC1343	LPC1345	LPC1346	LPC1347

Note however that although they are pin-to-pin compatible and that they can be mounted using the same footprint, these devices may need different firmwares to run, as they integrate different IPs (Intellectual Properties) for the CPU core itself, but also for some peripherals (GPIOs, timers and USB device controller, among others).

FAQ

• How do I get the schematic?

As a fully "Open Hardware" project, all design documents are made available in the USBug Github repository.

• Are your boards RoHS compatible?

Yes, the USBug board are designed to use RoHS-compatible components. However, you should also use RoHS PCB and solder to be fully compliant.

• What chip revision are your boards using?

The USBug board is designed to work with all NXP LPC LQFP48 packaged chips and do not depend on a specific chip revision. Although these chips are all pin-to-pin compatible, you should check for programming specificities and chip errata.

• Are the design files available (schematic, layout, BOM and Gerber files)?

Yes! As a fully "Open Hardware" project, all design documents are made available in the USBug Github repository.

• What is the warranty for your boards?

AS A FULLY "OPEN HARDWARE" PROJECT, THERE IS NO WARRANTY FOR THE PRODUCT, TO THE EXTENT PERMITTED BY APPLICABLE LAW. EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES PROVIDE THE PRODUCT “AS IS” WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PRODUCT IS WITH YOU. SHOULD THE PRODUCT PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING, REPAIR OR CORRECTION.

IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS THE PRODUCT AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OR INABILITY TO USE THE PRODUCT (INCLUDING BUT NOT LIMITED TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD PARTIES OR A FAILURE OF THE PRODUCT TO OPERATE WITH ANY OTHER PRODUCTS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.

• Where is the serial number?

The board itself does not have a serial number printed on it. However, the CPU provides both a Part ID and a Unique ID through either ISP ("In-circuit Serial Programming") or IAP ("In-Application Programming").

• Do you have high resolution pictures of your products?

As a fully "Open Hardware" project, all design documents are made available in the eagleUp USBug Github repository, as well as corresponding Sketchup 3D models and Kerkithea render files.

• Do you have a long-term commitment to production and availability of your boards?

As a fully "Open Hardware" project, all design documents are made available in the USBug Github repository. You are thus able to take all required measures yourself in order to obtain the desired availability.

• I cannot download the manuals or files in general. What to do?

Sorry, can't help with this general problem, try a proven working browser!

• How to erase flash on devices when JTAG/SWD interface accidentally disabled or PLL programmed wrongly by application program that is already in flash?

It is possible to disable the JTAG/SWD interface on the LPC1xxx processors from software. It is also possible to program the PLL wrong so that the processor hangs. If this happens, it can be impossible to communicate with the processor via the JTAG/SWD interface. The reason for this is that the application program in flash starts executing immediately after reset. A JTAG/SWD pod normally takes some time to start connecting to the processor. During this initial connection phase, the application program inside the processor can disable the JTAG/SWD interface or hangs the PLL. The internal flash must be erased to solve this situation. Pull the ISP enable signal low when powering the board. This signal is named "PIO0_1" for LPC11xx/13xx.

Immediately connect the processor UART/USB channel to the ISP program (for example FlashMagic). Erase flash from inside the ISP program. This procedure ensures that the application program in internal flash never executes on the processor after powerup. Also make sure to actually power cycle the processor before entering ISP mode. A warm reset does not always reset the PLL to a known state after reset. Therefore a cold reset is needed, i.e., cycle the power.

• Are your boards EMC tested/certified?

USBug boards have not been EMC tested individually since these are components. EMC test (and CE marking) is only done on final products and the result very much depends on the environment into which it is integrated to.

• Which free graphical libraries exist for NXP's processors?

microBuilder's LPC1114 Code Base software library or LPC1343 Code Base software library support all the main internal peripherals, and drivers for common hardware like I²C or SPI-based EEPROM. The code base includes complete C startup code and an easy to understand make file and linker script for building from the command-prompt on any OS (Yagarto 4.5.0 was used for builds), as well as project files for the open-source CodeLite C/C++ IDE and the commercial GCC-based Crossworks for ARM (useful for HW debugging).

• What software development environment (IDE, compiler, debugger) is recommended for your boards?

USBug does not endorse or include a specific software development environment - sometimes also called IDE (Integrated Development Environment).

We do however have good experience with the following products:

LPCXpresso IDE. It is designed to operate with low-cost target boards including embedded JTAG/SWD interface on the development board. The LPCXpresso IDE is free and after registration it has a 128 kB limitation. Different upgrades exist to raise the code size limit or completely remove it. It is possible to use the embedded JTAG/SWD interface on the target boards as a JTAG/SWD interface for other boards than the LPCXpresso target boards by cutting some traces. This way, a JTAG/SWD interface hardware will cost only what an LPCXpresso board cost (around 20 EUR / 30 USD),. This is the most cost-effective solution to get a working JTAG/SWD programming/debugging interface.
Keil - MDK/uVision. There is an 'MDK-Lite (32KB code size limit) Edition' is available for download. Keil has a JTAG/SWD interface called ULINK2 which works great together with MDK/uVision.
Code Red - Red Suite. Code Red is the supplier of the LPCXpresso IDE (and licensed to NXP) and Red Suite is their own, more versatile version of the development environment. Code Red has a JTAG/SWD interface called Red Probe+. Compare versions here.
Rowley - CrossWorks with the JTAG/SWD interface CrossConnect. There is a fully-functional version for 30 days evaluation.
IAR - Embedded Workbench

There are other products/(open source)projects than listed above. These have however not been tested with USBug. The ones in the list above we have good experience from using.

You can also use your favorite editor for editing, GCC for compiling and GDB for debugging. This setup require experience and knowledge.

Note that most of our sample applications have been created either for the LPCXpresso IDE or Keil uVision. It is not a very big job to port project settings from one development environment to another, but you are then on your own to provide free support for.

As for debugging, the use of a JTAG/SWD interface and a debugger integrated with the development environment is recommended. This setup gives the most powerful tool to start your program development.

Each software development environment listed above has accompanying JTAG/SWD interfaces. Segger has a very versatile JTAG/SWD interface called J-LINK, which works with many development environments. However, always check with the development supplier of your choice before purchase if J-LINK is supported. If you qualify for it (it should be the case if you are using it for hobby), you may check the relatively cheap J-Link EDU offer.

Most (cheaper) JTAG/SWD interfaces connect to the development PC via the USB interface. Only more expensive interfaces support Ethernet interfaces.