gen4 LCD CAPES – BeagleBone Black
gen4-4DCAPE Range Page 7 of 25 www.4dsystems.com.au
• The performance of the display will degrade under
high temperature and humidity. Avoid such conditions
when storing.
• Do not tamper with the display flex cable that is
connected to the control board. This may affect the
connection between the display and the driving
circuitry and cause failure. Under no circumstances
should the display flex be disconnected from the PCB
and power applied to the PCB, as this could result in
instant failure of the CAPE.
• Displays are susceptible to mechanical shock and any
force exerted on the module may result in deformed
zebra stripes, a cracked display cell and broken
backlight
• Always use the mounting holes (where applicable) on
the module to mount the display.
7. Optional Button Board
The gen4-4DCAPE has the option to use an external
button board, for actions such as up, down, left, right,
enter/return, power and reset, or as required by the
User.
Alternatively, any momentary push buttons can be
attached, as they are simply a connection between a
GPIO and GND to form the button press connection.
4D Systems provides a button board which can be used
if required, and supplied/sold on request. It is not
offered as part of the module as standard.
The gen4-4DCAPE button board is a small PCB with a
row of 7 momentary push buttons on the front, and a
10 way FFC connector designed for a 10-way ribbon
cable to attach to, and then connect to the gen4-
4DCAPE Adaptor board.
The 10 way FFC connectors for the gen4-gen4-4DCAPE
Button Board are Bottom Contact, meaning the
terminals need to be towards the PCB, and the
stiffener needs to be facing upwards (opposite to the
main 30 way FFC cable to the display).
8. Power Source
The gen4-gen4-4DCAPE power source comes from the
BBB, via the gen4-4D CAPE Adaptor board which plugs
on top of the BBB itself.
The Adaptor board taps into the VDD_5V bus power
on the BBB, which is connected to the DC Barrel Jack
on the BBB. It will not receive power when the BBB is
powered from USB, as the USB power goes via the BBB
power management IC, which then is supplied on the
SYS_5V bus.
It has been designed this way by default as the SYS_5V
system has finite capabilities, and depending what
else the BBB is doing and what other gen4-
CAPES/Devices are connected, there may not be
sufficient power left to supply the gen4-4DCAPE. Also,
if a SB (Super Bright) version of the gen4-4DCAPE is
used, it is very likely the USB power management
system would not supply enough power even if
nothing else was connected. It however is possible to
modify the gen4-4DCAPE Adaptor board to use the
SYS_5V bus, if required.
On the top of the gen4-4DCAPE Adaptor is a Solder
Jumper, which has 3 pads. By default, there is a track
connecting the centre pad to the side marked
VDD_5V. If SYS_5V is required instead, then this
VDD_5V track must be cut between these 2 pads, and
a solder blob be added instead between the centre
pad and the pad marked SYS_5V. DO NOT have both
sides connected to the centre pad at once, else your
BBB may be damaged.
A sharp craft knife, a soldering iron and solder are
required ideally for this modification.
Take care when doing this modification, as warranty
claims will not apply due to damage of the product
while undertaking this modification.
9. Display Module Part Numbers
The following is a breakdown on the part numbers and
what they mean.
Example:
gen4-4DCAPE-70CT-SB
gen4 - gen4 Display Range
4DCAPE - Display Family
70 - Display size (7.0”)
T - Resistive Touch.
CT - Capacitive Touch (with CLB)
SB - Super Bright Display
For part numbers which do not include T or CT,
these are non-touch variants.
Cover Lens Bezels (CLB) are glass fronts for the
display module with overhanging edges, which
allow the display module to be mounted directly
into a panel using special adhesive on the
overhanging glass. These are available for
Capacitive Touch only.