Umarim v1.0

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Umarim v1.0 bottom side

The ENAC team has been working on long endurance airplanes for a while now. It appeared that one of the many limitations was the integration of the electronic part into the new fuselages which are becoming thinner and thinner. So we started to work on a new version of autopilot mainly based on the well-known tiny. The new sensors becoming smaller and smaller, we were able to integrate onto the board the IMU and a new design of barometer. So now, the ENAC team is proud to present you the UMARIM! (which means "I Hope" in turkish)

Hardware Revision History

Version # Release Date Release Notes
v1.0 09/2011 Initial release of Umarim


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 Digital Baro-altimeter (Freescale MPXA6115 pressure sensor + Texas Instruments ADS1114 16bits ADC/PGA)
  • 6 x Servo PWM outputs
  • 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)
  • 4 x General Purpose I/O or Analog input channels (0V - 3.3V)
  • 5v / 1.5A switching power supply (input voltage range 5.5V min → 17.0v max)
  • 3.3v / 1A linear regulator
  • 2 x status LEDs
  • 9 grams (0,32 oz)
  • 56 x 25mm (2.2" x 0.98")
  • 4 layers PCB design

Pinout

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

Umarim v1-0 pinout.png


SRV0/1/2/3/6/7
Pin # Name Type Description Color
1 GND PWR common ground Black
2 +5V PWR 5V Rail from autopilot Orange
3 SRVx OUT Servo signal (PWM) White


RC
Pin # Name Type Description Color
1 GND PWR common ground Black
2 +5v PWR 5V Rail from autopilot Orange
3 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 SSEL1 IN SSP Slave Select. Selects the SSP interface as a slave (SSEL1) Brown
4 MOSI1 I/O SPI1 Master Out Slave In. Data output from master / data input to slave Grey
5 MISO1 I/O SPI1 Master In Slave Out. Data input to master / data output from slave Green
6 DRDY1 IN External interrupt 0 input (EINT0) Purple
7 SCK1 I/O SPI1 Serial clock. Clock output from master or input to slave Yellow


AUX
Pin # Name Type Description Color
1 GND PWR common ground Black
2 +5V PWR 5V Rail from autopilot Orange
3 +3.3V PWR 3.3V Rail from autopilot Red
4 AUX1 I/O General Purpose I/O #1 or ADC Input ADC_0 (lpc AD1.5)
5 AUX2 I/O General Purpose I/O #2 or ADC Input ADC_1 (lpc AD1.4)
6 AUX3 I/O General Purpose I/O #3 or ADC Input ADC_2 (lpc AD1.3)
7 AUX4 I/O General Purpose I/O #4 or ADC Input ADC_3 (lpc AD1.2)


UART0
Pin # Name Type Description Color
1 GND PWR common ground Black
2 +3.3V PWR 3.3V Rail from autopilot Red
3 RXD0 IN UART0 Serial Input (3.3V level, 5V Tolerant) Green
4 TXD0 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 RXD1 IN UART1 Serial Input (3.3V level, 5V Tolerant) Green
4 TXD1 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 SDA0 Open Drain
I/O
I2C0 bus Serial DAta Brown
4 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 SDA1
BOOT
Open Drain
I/O
I2C1 bus Serial DAta
In-Circuit Serial Programming (ISP) enable (P0.14, +3.3v pullup) (Note)
Brown
4 SCL1 Open Drain
I/O
I2C1 bus Serial CLock Blue

Note: Holding this pin low for at least 3mS after a RESET (or power up) instructs the controller to enter programming mode.


USB
Pin # Name Type Description Color
1 GND PWR common ground Black
2 USB+ I/O USB bidirectional D+ line Green
3 USB- I/O USB bidirectional D- line White
4 VBUS IN Indicates the presence of USB bus power (P0.23) (5V level) Orange

Schematic

Umarim V1.0 Schematic


Examples of Airborne Equipment Electrical Connections

Small Aircraft Connection Diagram

Umarim V1.0 small aircraft airborne equipment electrical connections


Large Aircraft Connection Diagram

Umarim V1.0 large aircraft airborne equipment electrical connections


PCB

Gerber & Drill Files

WARNING:

Umarim requires care during assembly of the ITG3200. While most are assembled fine (PPZUAV, ENAC, a few individuals have self assembled Umarim v1) The tolerances between the pad and the pins are quite close. During reflow the IC should center itself fine. However if it does not center it could connect the pad to a pin(s). Simplest way to avoid this is to use non conducting IC tape under the IC on the big square pad when doing self assembly.

PCB design Eurocircuits 6-C class compliant:

Download Umarim v1.0 gerber & drill files (zip)

RS274X, units = Inches, format = 2:5

  • Umarim_v1-0_SILKSCREEN_TOP.GBR (Top Component Print Layer)
  • Umarim_v1-0_SOLDERMASK_TOP.GBR (Top Solder Mask)
  • Umarim_v1-0_SIGNAL_TOP.GBR (Top Copper Layer)
  • Umarim_v1-0_INTERNAL_PLANE_1.GBR (Internal Copper Layer GND)
  • Umarim_v1-0_INTERNAL_PLANE_2.GBR (Internal Copper Layer +3.3V)
  • Umarim_v1-0_SIGNAL_BOTTOM.GBR (Bottom Copper Layer)
  • Umarim_v1-0_SOLDERMASK_BOTTOM.GBR (Bottom Solder Mask)
  • Umarim_v1-0_OUTLINE.GBR (Board Outline)
  • Umarim_v1-0_DRILL.GBR (NC XY coordinates & Drill tools sizes)

Assembly

Components Layout

Bill Of Material

Download Umarim v1.0 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 R16,R17 33.0 Ohm 1/10W 1% Panasonic - ECG 0603 P33.0HCT-ND
1 ERJ-3EKF1000V 100R R14 100 Ohm 1/10W 1% Panasonic - ECG 0603 P100HCT-ND
2 ERJ-3EKF3900V 390R R12,R13 390 Ohm 1/10W 1% Panasonic - ECG 0603 P390HCT-ND
2 ERJ-3EKF1501V 1.5K R11,R15 1.50K Ohm 1/10W 1% Panasonic - ECG 0603 P1.50KHCT-ND
1 ERJ-3EKF1801V 1.8K R18 1.80K Ohm 1/10W 1% Panasonic - ECG 0603 P1.80KHCT-ND
4 ERJ-3EKF2201V 2.2k R5-R8 2.20K Ohm 1/10W 1% Panasonic - ECG 0603 P2.20KHCT-ND
1 ERJ-3EKF3301V 3.3K R19 3.30K Ohm 1/10W 1% Panasonic - ECG 0603 P3.30KHCT-ND
5 ERJ-3EKF1002V 10K R1-R3,R9,R10 10.0K Ohm 1/10W 1% Panasonic - ECG 0603 P10.0KHCT-ND
1 ERJ-3EKF2203V 220K R4 220K Ohm 1/10W 1% Panasonic - ECG 0603 P220KHCT-ND
Capacitors
2 C1608C0G1H180J 18p C33,C34 Ceramic 18pF 50V C0G 5% TDK Corp. 0603 445-1272-1-ND
1 C1608X7R1H222K 2.2n/50V C32 Ceramic 2.2nF 50V X7R 10% TDK Corp. 0603 445-1309-1-ND
1 C1608X7R1H103K 10n C31 Ceramic 10nF 50V X7R 10% TDK Corp. 0603 445-1311-1-ND
24 CC0603KRX7R8BB104 100n C1-C9,C14-C27,C35 Ceramic 0.1uF 25V X7R 10% Yageo 0603 311-1341-1-ND
4 C1608X5R1E105K 1u/25V/X5R C11,C12,C29,C36 Ceramic 1.0uF 25V X5R10% TDK Corp. 0603 445-5146-1-ND
1 C1608X5R0J106M 10u/6.3V C30 Ceramic 10uF 6.3V X5R 20% TDK Corp. 0603 445-4112-1-ND
2 TAJA336K006RNJ 33u/6.3v C13,C28 Tantalum 33uF 6.3V 10% AVX Corp. A case (EIA 3216-18) 478-1666-1-ND
1 TR3D107K020C0080 100u/20V C10 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 MPXH6115AC6U MPXH6115AC6U IC1 Integrated Silicon Pressure Sensor Freescale Semicond. 1317A-03 MPXH6115AC6U-ND
1 ADS1114IRUGT ADS1114RUG IC2 16-BIT I2C Analog-to-Digital Converter Texas Instruments X2QFN10 296-24933-1-ND
1 PCA9306DCUR PCA9306DCU IC3 Dual Bidirectional I2C Voltage-Level Translator Texas Instruments VSSOP8 296-17988-1-ND
1 TPS62112RSAT TPS62112 IC4 17V, 1.5-A, Synchronous Step-Down Converter Texas Instruments QFN16 296-19717-1-ND
1 LM3940IMP-3.3/NOPB LM3940IMP-3.3 IC5 1A low dropout regulator for 5V to 3.3V conversion National Semicond. SOT223 LM3940IMP-3.3CT-ND
1 LT6654BHS6-3.3#TRMPBF LT6654BHS6-3.3 IC6 3.3V Precision Voltage Reference Linear Technology SOT23-6 LT6654BHS6-3.3#TRMPBFCT-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 CD4017BPWR 4017 IC10 Decade Counter/Divider with 10 Decoded Outputs Texas Instruments TSSOP16 296-14252-1-ND
1 LT6656BCS6-5#TRMPBF LT6656S6-5 IC11 5V Precision Voltage Reference Linear Technology SOT23-6 LT6656BCS6-5#TRMPBFCT-ND
1 APT1608SURCK KP-1608SURC LED1 SMD Chip Red LED Lamp Kingbright Corp. 0603 754-1123-1-ND
1 APT1608MGC KP-1608MGC LED2 SMD Chip Green LED Lamp Kingbright Corp. 0603 754-1118-1-ND
1 DTA143ZE-TP DTA143ZE T1 PNP Pre-Biased Small Signal Transistor Micro Commercial Co. SOT523 DTA143ZE-TPMSCT-ND
Connectors
7 53047-0310 RC,SRV0-3,SRV6-7 J3,J8-J13 Picoblade 3 pins 1.25mm straight header Molex Inc. - WM1732-ND
5 53047-0410 UART0-1,USB J2,J5-J7,J14 Picoblade 4 pins 1.25mm straight header Molex Inc. - WM1733-ND
2 53047-0710 SPI1,AUX J4,J15 Picoblade 7 pins 1.25mm straight header Molex Inc. - WM1736-ND
Other
1 CX5032GB12000H0PESZZ CX5032GB12000 Q1 CRYSTAL 12.0MHZ 12PF SMD AVX Corp. 5.0x3.2mm 478-4359-1-ND

PCB and assembled boards suppliers

Hopefully, available soon on Get Hardware page :)


Mechanical Dimensions

Umarim v1.0 Mechanical Dimensions


Downloads

WARNING: THERE IS AN ERROR IN THESE GERBER FILES!

The footprint of the ITG3200 extends below the base of the IC. Because the IC has a metal baseplate, this causes a 0.025mm tolerance on placement of the ITG-3200 which is almost impossible to achieve. I an unable to correct the files because I don't have Protel.

Source files

Gerber & Drill files

Assembly files

Paparazzi USB Bootloader Upload

Required components


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

Umarim V1.0 Paparazzi bootloader upload connections


Boot Sequence

LPC based autopilot boot sequence