The SuperPRO is footprint and pin compatible with the
Arduino PRO. In addition it has an onboard 5V regulator so it is compatible
with 5V shield boards.
BASIC or C programs can be downloaded using the installed test connector
using the USB dongle contained in Coridium's evaluation kit or using the SparkFun USB Basic Breakout board or FTDI cable from Digikey. More details on these
connections here.
Digital IO connections -- rev 5 or later
The rev 5 adds a parallel
connection for pins that are on 0.1" centers. This artwork is also
shared with the PROplus version of the board.
The SuperPRO uses an LPC1756
and has 5V and 3.3V supplies.
The simpler PROplus uses an
LPC1751 and has only the 3.3V supply.
Port pins can be controlled
with the
P0..P4 keywords. Port 0 pins can be
accessed with the original
IN, OUT... keywords . More details on
the GPIOs can be found in the NXP User Manual.
Digital IO connections -- rev 4
Special
purpose pins
The LPC1756 supports a number of dedicated
functions. Those include 4 UARTs, USB, 2 SSPs, 1 SPI, 2 CAN, 2 I2C,
I2S, 2 multi-channel PWMs, Quadrature Encoder, dedicated motor control PWM,
interrupts, timer counter capture and match.
In addition most can be configured with
pullups and default to pullups following reset.
Details can be found in NXP's User
manual.
Analog connections
4 A/D converters are readily
available, Analog 2-4. 2 more are available, but share the pins with UART0
-- what was NXP thinking, I have no idea.
1 10 bit DAC is available
shared with AD(3) available on the SuperPRO (not on PROplus)
On reset or power up the AD
pins are configured by software as AD inputs. To change those to
digital IOs, the user must write to the appropriate PINSEL register.
The LPC1756
does support an external reference for the A/D converters, but to
use the Arduino AREF pin a jumper is required (details on the
schematic)
The A/D input requires a
drive impedance of 7.5K or less (see NXP LPC175x spec sheet). We've also
found a 100 to 1000 pF cap from AD input to GND can remove high frequency noise
affecting high order bits in the converter.
Analog Isolation
The rev 6 and 7 boards
isolate both GND and power for the analog section using ferrite beads.
to add isolation to rev 4/5 boards
-
The LPC17xx series chips AD
converter are sensitive to high frequency noise on the analog GND (Vssa) or on
the AD inputs themselves. A symptom that will show up is bits in any bit
position turned on/off when the conversion is done. This makes it hard to
average out, but conversion can be voted on, choosing 2/3 conversions that agree
within a few bits. The occurance of these errors is in less than 1% of the
conversions, unless your setup is very noisy.
Another option is to change
the analog GND connection on the board. Do this by cutting the trace on the
back side between GND under the crystal and the GND connected to Vssa (shown on
the picture below)
Then connect digital GND to
analog GND using a ferrite bead, a convenient place to do this is on the front
side as shown below.
Pin limitations
P0.29 and P0.30 direction
control must be done in parallel, they can be both outputs or both inputs, but
not mixed.
Power connections -- SuperPRO
Pads for a Cui PJ-002A or
SparkFun PRT-119 power connector are available in the
lower left hand corner.
For both battery and 6V
input, 2 pin 0.1" spaced holes are available for wires or headers. When
using the battery connector, total current draw for the board must be limited to
200mA. If you want to use more currrent, you should install a jumper
around the D2 diode (holes are available above D2).
Diode steering allows power to be supplied from a barrel
connector from a 6V unregulated source, 5V USB test connector, or the battery
connector. Because of the Schottky diodes, all 3 power sources can be
connected simultaneously. If you are using an unregulated wall transformer, you must
check the open circuit voltage and it MUST be less than 12V.
When the 6V source is used, 5V Arduino
shields can be powered from the SuperPRO.
The schematic below describes this circuit
on the SuperPRO
Power connections -- PROplus
Pads for a Cui PJ-002A or
SparkFun PRT-119 power connector are available in the
lower left hand corner.
For both battery and 6V
input, 2 pin 0.1" spaced holes are available for wires or headers. When
using the battery connector, total current draw for the board must be limited to
200mA. If you want to use more currrent, you should install a jumper
around the D2 diode (holes are available above D2).
Diode steering allows power to be supplied from a barrel connector from a 6V
unregulated source, 5V USB test connector, 5V from a shield or the battery
connector. Because of the Schottky diodes, all 3 power sources can be
connected simultaneously. If you are using an unregulated wall transformer, you must
check the open circuit voltage and it MUST be less than 12V.
The PROplus only has the 3.3V regulator, so
it cannot supply power to a 5V shields.
The schematic below describes this circuit
on the PROplus
Power connections details
The 3.3V regulator can
supply 50 mA, with most being used by the LPC2103. The 3.3V connection next
to RESn on the lower power connector is only connected if the shorting pads
are shorted (NOT the factory default).
The analog GND should be
used to connect to the GND of analog inputs. Digital and Analog GNDs are
connected together with a small trace, but to minimize noise you should use the
analog GND only for analog signals.
Jumpers and
test connector for Program Download
The USB Dongle from Coridium will supply 5V
from the USB to power the ARMmite PRO. It also controls the RESET and BOOT
signals to automatically load C or BASIC programs using MakeItC or
BASICtools. Remember, if you load a C program, it will erase the BASIC
firmware and you will not be able to load BASIC programs after that.
When using the SparkFun FTDI Basic Breakout
Board, a limited amount of power can be supplied from the BBB, but this is
limited to 50 mA and after diode drops, its about 2.8V to the LPC2103. In
practice this will run, but it is outside the part specifications, so it
should be limited in use.
Also with the SparkFun FTDI Basic
Breakout Board to load a C program, the LOAD C jumper needs to be installed,
then removed to run the program. BASIC programs can be loaded and
controlled using the SparkFun board, with no additional steps/jumpers.
PROplus
SuperPRO
An alternative is to use a 2 pin header
with a shorting block (pictured below)
Real Time
Clock Oscillator
The RTC oscillator of the
LPC17xx parts has been resolved. The first generation parts which were
shipped in early 2011 had an unreliable oscillator and this has been corrected by
NXP.
A 32 KHz crystal and diode for battery
backup with an optional ML2020 rechargeable Li battery.
A Panasonic ML2020H rechargeable battery
may be added to keep the real time clock running when power is removed.
The battery is mounted on the back of the board as shown below. The
VL2020/HFN will also work, though it is more expensive and has less power.
USB connector
option for power and SPI Flash option
The rev 6/7 boards add pads for an optional
SPI Serial Flash (note pin 1 location). Also pads for a USB mini-B
connector have been added, this is intended primarily to supply power, and the
data lines are connected to pads. These options can be installed at
Coridum for orders of 10 boards or more. Contact
sales@coridiumcorp.com for
details.
