4d Systems 2.8" TFT Intelligent Display $LCD-28PTU uLCD-28PTU データシート
製品コード
uLCD-28PTU
4D SYSTEMS µLCD-28PTU
© 2014 4D SYSTEMS Page 10 of 22 www.4dsystems.com.au
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“PICASO-Processor-Datasheet-REVx.pdf”
Audio
Audio playback support in the PICASO Processor
enables the μLCD-28PTU module to play audio
WAV files stored in the micro-SD memory card.
PWM and an on-board audio amplifier with 8Ω
speaker ensure ample audio output capability. A
simple
instruction
enables
the
user
to
play/pause/stop audio files while continuing the
execution of the user application code, such as
display
execution of the user application code, such as
display
updates,
touch
recognition,
communications, etc. The audio system also allows
real time pitch change of audio samples.
For a complete list of audio commands please
refer to the separate document titled:
“PICASO-4DGL-Internal-Functions.pdf”
real time pitch change of audio samples.
For a complete list of audio commands please
refer to the separate document titled:
“PICASO-4DGL-Internal-Functions.pdf”
Note: The on-board speaker is a small device
designed to project into an audio cavity. It is not
very loud by itself. To enable louder audio, it is
recommended to use a larger external 8Ω speaker.
See the ‘Hardware Interface Pins’ – ‘System Pins’
section for more information.
designed to project into an audio cavity. It is not
very loud by itself. To enable louder audio, it is
recommended to use a larger external 8Ω speaker.
See the ‘Hardware Interface Pins’ – ‘System Pins’
section for more information.
Lithium Batteries
The μLCD-28PTU module includes a battery
charging circuit suitable for Lithium Ion (LiIon) and
Lithium Polymer (LiPo) batteries, which is designed
to work only with 3.7V batteries. If anything other
than a LiIon or LiPo 3.7V battery is connected the
module could be damaged. Features current
sensing and reverse discharge protection using an
on board Lithium charge management controller.
When the Lithium battery is connected and an
external source (4.5V minimum) is connected to
either of the +5V pins, the Lithium battery will be
charged automatically. If the 5V source is
disconnected, the Lithium battery will be switched
in circuit and continue to power the module
automatically.
Charge voltage = 4.2V, Charge current = ~210mA
When running from the Lithium battery, when the
battery level drops down to ~3.7V, the Status
input (connected to IO2) into the Picaso will be
triggered indicating the battery is discharged. The
display should then be connected to an external
5V source for charging. When the battery is at this
cut off voltage, μSD card read and write operations
should be avoided, as they may fail due to low
voltage. It is up to the User to handle the
operation of the display module when using a
Lithium Battery.
cut off voltage, μSD card read and write operations
should be avoided, as they may fail due to low
voltage. It is up to the User to handle the
operation of the display module when using a
Lithium Battery.
WARNING:
There is a large range of Lithium
batteries available on the market. Some include
safety circuits built in, while others do not. Lithium
batteries can explode if short circuited,
overcharged, if they get too hot, and can leak if
they sit fully discharged for a prolonged period.
4D Systems recommends whenever Lithium
batteries are used that caution and due diligence
should be exercised to ensure the safety of the
user and nearby people. While the chances of
explosion or leakage may be minimal, 4D Systems
recommends safe practices at all times when
dealing with these batteries.
If Lithium Batteries are powering the module, it is
highly recommended to periodically monitor the
STAT pin. If the module is put to sleep, periodically
wake the module to check the STAT pin.
safety circuits built in, while others do not. Lithium
batteries can explode if short circuited,
overcharged, if they get too hot, and can leak if
they sit fully discharged for a prolonged period.
4D Systems recommends whenever Lithium
batteries are used that caution and due diligence
should be exercised to ensure the safety of the
user and nearby people. While the chances of
explosion or leakage may be minimal, 4D Systems
recommends safe practices at all times when
dealing with these batteries.
If Lithium Batteries are powering the module, it is
highly recommended to periodically monitor the
STAT pin. If the module is put to sleep, periodically
wake the module to check the STAT pin.
SD/SDHC Memory Cards
The module supports micro-SD memory cards via
the
on-board
micro-SD
connector. The memory card
is used for all multimedia file
retrieval such as images,
animations and movie clips.
The memory card can also be used as general
purpose storage for data logging applications.
Support is available for off the shelf micro-SD and
high capacity HC memory cards (4GB and above).
is used for all multimedia file
retrieval such as images,
animations and movie clips.
The memory card can also be used as general
purpose storage for data logging applications.
Support is available for off the shelf micro-SD and
high capacity HC memory cards (4GB and above).
Note: A microSD card capable of SPI is a
requirement for all 4D Systems’ display modules
powered by Goldelox, Picaso or Diablo16
Processors. If a non-SPI compatible card is used, it
will simply fail to mount, or may cause
intermittent issues resulting in lock ups and
crashing of the application. Please refer to the 4D
Systems website for microSD cards offered by 4D
Systems.
requirement for all 4D Systems’ display modules
powered by Goldelox, Picaso or Diablo16
Processors. If a non-SPI compatible card is used, it
will simply fail to mount, or may cause
intermittent issues resulting in lock ups and
crashing of the application. Please refer to the 4D
Systems website for microSD cards offered by 4D
Systems.
FAT16
The μLCD-28PTU uses off the shelf standard
SDHC/SD/micro-SD memory cards with up to 2GB
capacity usable with FAT16 formatting. For any
FAT file related operations, before the memory
card can be used it must first be formatted with