NavGo v3

Hardware Revision History

Version #	Release Date	Release Notes
v3	07/2012	Minor PCB modifications
v2	11/2011	Barometer redesign
v1	08/2011	Initial release of NavGo

Features

NXP LPC2148 MCU based
1 x Triple axis Digital Gyroscope (Invensense ITG-3200)
1 x Triple axis Digital Accelerometer (Analog Devices ADXL345)
1 x Triple axis Magnetometer (Honeywell HMC5883L)
1 x Digital Baro-altimeter (Freescale MPXA6115 pressure sensor + Microchip MCP3550-60 22bits ADC)
1 x R/C receiver PPM frame input
2 x UART (TTL 3.3V, 5V tolerant)
2 x I²C bus
1 x SPI bus
1 x USB (client)
2 x General Purpose I/O or Analog input channels (0V - 3.3V)
5v / 1.5A switching power supply (input voltage range 5.5V min → 16.0v max)
3.3v / 1A linear regulator
4 x status LEDs
?? grams (?,? oz)
35 x 35mm (1.38" x 1.38")
4 layers PCB design

NavGo v3 3D bottom view
NavGo v3 3D top view
NavGo v3 top side.png

NavGo v3 top side
NavGo v3 bottom side.png

NavGo v3 bottom side

Pinout

Pins Name and Type are specified with respect to the Autopilot Board

**R/C**
Pin #	Name	Type	Description	Color
1	GND	PWR	common ground	Black
2	+3.3V	PWR	3.3V Rail from autopilot	Red
3	+5v	PWR	5V Rail from autopilot	Orange
4	PPM_IN	IN	PPM Stream from R/C Receiver (5V tolerant)	White

**SPI1**
Pin #	Name	Type	Description	Color
1	GND	PWR	common ground	Black
2	+3.3V	PWR	3.3V Rail from autopilot	Red
3	+5V	PWR	5V Rail from autopilot	Orange
4	CSE	I/O	External Chip Select output or General Purpose I/O digital (P1.19) (Note 3)	Brown
5	SCK1	I/O	SPI1 Serial clock. Clock output from master or input to slave	Yellow
6	MISO1	I/O	SPI1 Master In Slave Out. Data input to master / data output from slave	Green
7	MOSI1	I/O	SPI1 Master Out Slave In. Data output from master / data input to slave	Grey

**UART0**
Pin #	Name	Type	Description	Color
1	GND	PWR	common ground	Black
2	+3.3V	PWR	3.3V Rail from autopilot	Red
3	+5V	PWR	5V Rail from autopilot	Orange
4	RX0	IN	UART0 Serial Input (3.3V level, 5V Tolerant)	Green
5	TX0	OUT	UART0 Serial Output (3.3V level)	Blue

**UART1**
Pin #	Name	Type	Description	Color
1	GND	PWR	common ground	Black
2	+3.3V	PWR	3.3V Rail from autopilot	Red
3	+5V	PWR	5V Rail from autopilot	Orange
4	RX1	IN	UART1 Serial Input (3.3V level, 5V Tolerant)	Green
5	TX1	OUT	UART1 Serial Output (3.3V level)	Blue

**I2C0**
Pin #	Name	Type	Description	Color
1	GND	PWR	common ground	Black
2	+3.3V	PWR	3.3V Rail from autopilot	Red
3	+5V	PWR	5V Rail from autopilot	Orange
4	VBAT	PWR	+V Battery Rail (Note 1)	Yellow
5	SDA0	Open Drain I/O	I2C0 bus Serial DAta	Brown
6	SCL0	Open Drain I/O	I2C0 bus Serial CLock	Blue

**I2C1**
Pin #	Name	Type	Description	Color
1	GND	PWR	common ground	Black
2	+3.3V	PWR	3.3V Rail from autopilot	Red
3	+5V	PWR	5V Rail from autopilot	Orange
4	SCL1	Open Drain I/O	I2C1 bus Serial CLock	Blue
5	SDA1 BOOT	Open Drain I/O	I2C1 bus Serial DAta In-Circuit Serial Programming (ISP) enable (P0.14, +3.3V pullup) (Note 2)	Brown

**AUX1**
Pin #	Name	Type	Description	Color
1	GND	PWR	common ground	Black
2	+5V	PWR	5V Rail from autopilot	Orange
3	AUX1	I/O	General Purpose I/O digital (P0.7/SSEL0/PWM2/EINT2) (Note 3)

**AUX2**
Pin #	Name	Type	Description	Color
1	GND	PWR	common ground	Black
2	+3.3V	PWR	3.3V Rail from autopilot	Red
3	+5V	PWR	5V Rail from autopilot	Orange
4	AUX2	I/O	General Purpose I/O digital (P0.21/PWM5/CAP1.3) or ADC Input (AD1.6) (Note 3)

Note 1: Can be used as alternate battery connection (source or sink).
Note 2: Holding this pin low for at least 3ms after a RESET (or power up) instructs the controller to enter programming mode.
Note 3: see LPC2148 documentation for detailed pin function description.

Schematic

Example of Airborne Equipment Electrical Connections

PCB

Gerber & Drill Files

PCB design Eurocircuits 6-C class compliant:

Download NavGo v3 gerber & drill files (zip)

RS274X, units = Inches, format = 2:5

Navgo_v3_Silkscreen_Top.GBR (Top Component Print Layer)
Navgo_v3_Soldermask_Top.GBR (Top Solder Mask)
Navgo_v3_Paste_Mask_Top.GBR (Top Paste Mask)
Navgo_v3_Signal_Top.GBR (Top Copper Layer)
Navgo_v3_Internal_Plane_1.GBR (Internal Copper Layer Gnd)
Navgo_v3_Internal_Plane_2.GBR (Internal Copper Layer +3.3v)
Navgo_v3_Signal_Bottom.GBR (Bottom Copper Layer)
Navgo_v3_Paste_Mask_Bottom.GBR (Bottom Paste Mask)
Navgo_v3_Soldermask_Bottom.GBR (Bottom Solder Mask)
Navgo_v3_Outline.GBR (Board Outline)
Navgo_v3_Drill.GBR (NC XY Coordinates & Drill Tools Sizes)

Assembly

Components Layout

NavGo v3 bottom components Layout
NavGo v3 top components Layout
NavGo v3 bottom components detail
NavGo v3 top components detail

Bill Of Material

Download NavGo v3 Bill of Material (zipped .xls file)

Qty	Manufacturer part number	Part name / value	Designator	Description	Manufacturer	Package type	Digikey part number	Other distributor
Resistors
2	ERJ-3EKF33R0V	33R	R19,R20	33.0 Ohm 1/10W 1%	Panasonic - ECG	0603	P33.0HCT-ND
1	ERJ-3EKF1000V	100R	R12	100 Ohm 1/10W 1%	Panasonic - ECG	0603	P100HCT-ND
4	ERJ-3EKF3900V	390R	R6 to R9	390 Ohm 1/10W 1%	Panasonic - ECG	0603	P390HCT-ND
1	ERJ-3EKF1501V	1.5K	R18	1.50K Ohm 1/10W 1%	Panasonic - ECG	0603	P1.50KHCT-ND
6	ERJ-3EKF1801V	1.8K	R10,R11,R14 to R17	1.80K Ohm 1/10W 1%	Panasonic - ECG	0603	P1.80KHCT-ND
3	ERJ-3EKF3301V	3.3K	R3 to R5	3.30K Ohm 1/10W 1%	Panasonic - ECG	0603	P3.30KHCT-ND
2	ERJ-3EKF1002V	10K	R13,R21	10.0K Ohm 1/10W 1%	Panasonic - ECG	0603	P10.0KHCT-ND
1	ERJ-3EKF1502V	15k	R2	15.0K Ohm 1/10W 1%	Panasonic - ECG	0603	P15.0KHCT-ND
1	ERJ-3EKF4702V	47k	R1	47.0K Ohm 1/10W 1%	Panasonic - ECG	0603	P47.0KHCT-ND
Capacitors
2	C1608C0G1H180J	18p	C28,C29	Ceramic 18pF 50V COG 5%	TDK Corp.	0603	445-1272-1-ND
1	C1608C0G1H470J	47p	C13	Ceramic 47pF 50V COG 5%	TDK Corp.	0603	445-1277-1-ND
1	C1608X7R1H222K	2.2n/50V	C27	Ceramic 2.2nF 50V X7R 10%	TDK Corp.	0603	445-1309-1-ND
2	C1608C0G1H103J	10n	C3,C26	Ceramic 10nF 50V COG 5%	TDK Corp.	0603	445-7404-1-ND
16	CC0603KRX7R8BB104	100n	C5 to C12,C16 to C23	Ceramic 0.1uF 25V X7R 10%	Yageo	0603	311-1341-1-ND
1	C1608X7R1E224K	220n	C30	Ceramic 0.22uF 25V X7R 10%	TDK Corp.	0603	445-5191-1-ND
3	C1608X5R1E105K	1u/25V/X5R	C1,C2,C25	Ceramic 1.0uF 25V X5R 10%	TDK Corp.	0603	445-5146-1-ND
1	C1608X5R0J475M/0.80	4.7u	C31	Ceramic 4.7uF 6.3V X5R 20%	TDK Corp.	0603	445-1417-1-ND
1	C1608X5R0J106M	10u/6.3V	C4	Ceramic 10uF 6.3V X5R 20%	TDK Corp.	0603	445-4112-1-ND
2	TAJA336K006RNJ	33u/6.3v	C15,C24	Tantalum 33uF 6.3V 10%	AVX Corp.	A case (EIA 3216-18)	478-1666-1-ND
1	TR3D107K020C0080	100u/20V	C14	Tantalum 100uF 20V 10%	Vishay/Sprague	D case (EIA 7343-31)	718-1774-1-ND
Inductors
1	B82462G4682M	6.8u	L1	1.65A Power Inductor	Epcos Inc.	6.0x6.0 mm	495-1999-1-ND
Semiconductors
1	LP2985-50DBVR	LP2985-50	IC1	5v/150mA low-noise low-dropout regulator	Texas Instruments	SOT23-5	296-20717-1-ND
1	MPXH6115AC6U	MPXH6115AC6U	IC2	Integrated Silicon Pressure Sensor	Freescale Semicond.	1317A-03	MPXH6115AC6U-ND
1	MCP3550-60E/MS	MCP3550-60-E-MS	IC3	Low-Power 22-Bit Delta-Sigma ADC	Microchip Technology	MSOP8	MCP3550-60E/MS-ND
1	SN74LVC2T45DCU	SN74LVC2T45DCU	IC4	Dual-Bit Dual-Supply Bus Transceiver	Texas Instruments	VSSOP8	296-17014-1-ND
1	TPS62112RSAT	TPS62112	IC5	17V, 1.5-A, Synchronous Step-Down Converter	Texas Instruments	QFN16	296-19717-1-ND
1	LM3940IMP-3.3/NOPB	LM3940IMP-3.3	IC6	1A low dropout regulator for 5V to 3.3V conversion	National Semicond.	SOT223	LM3940IMP-3.3CT-ND
1	ADXL345BCCZ-RL	ADXL345	IC7	3-Axis 16 g Digital Accelerometer	Analog Devices Inc.	LGA14	ADXL345BCCZ-RLCT-ND
1	LPC2148FBD64,151	LPC2148FBD64	IC8	Single-chip ARM7 32-bit microcontroller	NXP Semicond.	LQFP64	568-1765-ND
1	ITG-3200	ITG-3200	IC9	3-Axis Digital-Output Gyroscope	InvenSense	QFN24	N/A	Farnell(#1858279),Sparkfun(#SEN-09793)
1	HMC5883L	HMC5883L	IC10	Three-Axis Digital Compass	Honeywell	LCC16	342-1082-1-ND
1	APT1608SURCK	KP-1608SURC	LED1	SMD Chip Red LED Lamp	Kingbright Corp.	0603	754-1123-1-ND
1	APT1608SECK	KP-1608SEC	LED2	SMD Chip Orange LED Lamp	Kingbright Corp.	0603	754-1120-1-ND
1	APT1608MGC	KP-1608MGC	LED3	SMD Chip Green LED Lamp	Kingbright Corp.	0603	754-1118-1-ND
1	APT1608SYCK	KP-1608SYC	LED4	SMD Chip Yellow LED Lamp	Kingbright Corp.	0603	754-1124-1-ND
1	DTA143ZE-TP	DTA143ZE	T1	PNP Pre-Biased Small Signal Transistor	Micro Commercial Co.	SOT523	DTA143ZE-TPMSCT-ND
Connectors
1	53048-0310	AUX1	J8	1.25mm Pitch Wire-to-Board 3pin Header	Molex Inc.	-	WM1743-ND
2	53048-0410	RC,AUX2	J2,J9	1.25mm Pitch Wire-to-Board 4pin Header	Molex Inc.	-	WM1744-ND
3	53048-0510	UART0,UART1,I2C1	J4,J5,J7	1.25mm Pitch Wire-to-Board 5pin Header	Molex Inc.	-	WM1745-ND
1	53048-0610	I2C0	J6	1.25mm Pitch Wire-to-Board 6pin Header	Molex Inc.	-	WM1746-ND
1	53048-0710	SPI1	J3	1.25mm Pitch Wire-to-Board 7pin Header	Molex Inc.	-	WM1747-ND
1	47346-0001	USB	J10	Micro-USB B receptacle	Molex Inc.	-	WM17141CT-ND
Other
1	7M-12.000MAAJ	7M-12.000	Q1	Crystal 12.000MHZ 18pF	TXC Corp.	3.2x2.5mm/4pin	887-1121-1-ND

PCB and assembled boards suppliers

Check availability on Get Hardware page

Design source files

download NavGo v3 Protel 99SE SP6 design (zipped Protel 99 ddb file)

Mechanical Dimensions

Paparazzi USB Bootloader Upload

Required components

1 x FTDI TTL-232R-3V3 (Digikey #768-1015-ND) USB to UART converter cable with +3.3V TTL level UART signals. (see Note 1)
2 x 4-pin connector housing Molex Picoblade 51021-0400 (Digikey #WM1722-ND)
5 x crimp terminal female Molex Picoblade 50058-8000 (Digikey #WM1775CT-ND)
1 x 6-pin 0.1" pitch single in line male connector header Samtec TSW-132-07-TS (Digikey #SAM1035-32-ND) or equivalent
28-32AWG wiring cable

Note1: It is advised to use FTDI USB-serial converter, as serial FTDI chips are by default working well in Linux.

The Paparazzi ground station software is configured to look for modems on FTDI ports by default.

This harness can also serve as a modem interface (after it's use in Bootloader uploading) if you plug it on Umarim's UART1 connector

Connection Diagram

Make up a wiring harness similar to the following

NavGo v3 Paparazzi bootloader upload connections

Boot Sequence