University of Leicester
PLUME
Date: 05/03/2010
Ref: PLM-COMS-CircuitDiag-147-3
COMS Flight Board Layout
Michael McNally
Date
Updated Reference Number
change
04/03/2010
05/03/2010
23/03/2010
25/03/2010
PLM-COMS-CircuitDiag-147-0
PLM-COMS-CircuitDiag-147-1
PLM-COMS-CircuitDiag-147-2
PLM-COMS-CircuitDiag-147-3
First Draft
Second Draft
All pins, CAM links added
I2C pull-ups added
This circuit diagram is based around the COMS test board circuit designed by Duncan Ross.
PC104 Pins :
Pin Name
RAD-TXD
RAD-RXD
RAD-CO1
RAD-CO2
RAD-TXP1
RAD-TXP2
RAD-5V
RAD-GND
VCC
Pin Assignment
H1:39
H1:40
H2:10
H2:11
H1:9
H1:12
H2.25
H2.32
H2.27
H1.21
H1.23
H1.17
H1.18
Signal
5V digital
5V digital
3.3V digital
3.3V digital
3.3V digital
3.3V digital
5V Regulated Power
Digital Ground
3.3V Regulated Power
I2C
I2C
3.3V digital
3.3V digital
Pin Role
Serial Data (Transmit)
Serial Data (Receive)
Coil Deployer 1
Coil Deployer 2
Radio Transmit Power
Radio Transmit Power
+5V power, shared with OBDH, ADCS
Digital Ground shared with ADCS
Used for I2C pull-ups
I2C pullup
I2C pullup
I2C pullup
I2C pullup
University of Leicester
PLUME
Date: 05/03/2010
Ref: PLM-COMS-CircuitDiag-147-3
N.B. We currently do not have a spare radio module. Ideally
the board should be manufactured so that the radio module
can be fitted some time after the board is layed out. If this is
impractical / impossible then a radio module can be removed
from one of the test boards. Radio module schematic is
shown on the left. The radio module must also be mounted as
centrally as possible to bring the centre of mass as close to
the middle as possible.
RAD-TXP1 & 2 Logic table
RAD-TXP1
(signal)
0
0
1
1
RAD-TXP2
(signal)
0
1
0
1
Output voltage
0V
1.7V
3.4V
5.0V
University of Leicester
PLUME
Date: 05/03/2010
Ref: PLM-COMS-CircuitDiag-147-3
University of Leicester
PLUME
Date: 05/03/2010
Ref: PLM-COMS-CircuitDiag-147-3
University of Leicester
PLUME
Date: 05/03/2010
Ref: PLM-COMS-CircuitDiag-147-3
University of Leicester
PLUME
Date: 05/03/2010
Ref: PLM-COMS-CircuitDiag-147-3
University of Leicester
PLUME
Date: 05/03/2010
Ref: PLM-COMS-CircuitDiag-147-3
University of Leicester
PLUME
Date: 05/03/2010
Ref: PLM-COMS-CircuitDiag-147-3
University of Leicester
PLUME
Date: 05/03/2010
Ref: PLM-COMS-CircuitDiag-147-3