4d Systems Amazing 3.5" Display Module powered by a PIC32 PICadillo-35T Picadillo-35T Hoja De Datos
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Picadillo-35T
4D SYSTEMS PICadillo-35T Display Module
© 2014 4D SYSTEMS Page 23 of 31 www.4dsystems.com.au
7. Additional Features
On Board Audio Amplifier
7.1.
The PICadillo-35T features an on-board amplifier,
capable of driving up to 1W and up to a 4ohm
speaker, or the small speaker found on board the
module itself.
The on-board amplifier is fed from the PIC32 using
a filtered PWM signal, and also features an
amplifier enable so the amplifier can be disabled
by the user.
Based on the settings applied to Jumper J1, will
determine if the PWM signal and Audio Enable
signals are routed from the PIC32, or if they are
routed to the headers for alternate use. It is not
possible to have the audio and amplifier enabled if
the 2 GPIO are desired to be used by the User for
other uses.
Name
Chip Pin
IDE Pin
AUDIO (RD1)
47
31
AUDENB (RB14)
43
33
The AUDENB signal is Active Low, meaning you
need to drive the AUDENB signal low in order to
Enable the on board amplifier. Drive the pin high,
or setting the pin to INPUT will disable the
amplifier. The Amplifier Enable pin on the
amplifier itself has a pull-up resistor, which will by
default hold the amplifier to be in a disabled state.
The on-board amplifier is an ST TDA2822D.
If a larger external speaker is desired, instead of
the small on board speaker, it can be carefully
unsoldered from the + and – pads on the PCB, and
a larger speaker be connected in its place.
Please note the amplifier can drive a max of 4ohm
load and a max of 1W (when using a 32ohm
speaker). The recommended speaker rating is
8ohm 0.8W.
Real Time Clock Calendar
7.2.
The PICadillo-35T utilises the built in RTCC found
on the PIC32 that can be used to maintain time
and date information. It has an on board
32.768KHz oscillator mounted and ready to go.
Please refer to the Microchip datasheet for this
PIC32 processor, for more information about the
RTCC.
Touch Screen Interface
7.3.
The PICadillo-35T has a 4 wire touch screen
interface. The following pins (2 Analog, 2 Digital)
are used to interface to the 4 wire touch:
Name
Ref
Chip Pin
IDE Pin
YU (Y Up)
RB12
41
43
XL (X Left)
RB13
42
44
YD (Y Down)
RC2
7
45
XR (X Right)
RC3
8
46
Note: These pins are dedicated to the LCD displays
4 wire touch, and are not present on any other
headers or pins.
PIC32 on-board USB Controller
7.4.
The on-board USB 2.0 controller built into the
PIC32, has been broken out to 4 pads at the top
right of the PICadillo-35T. Wires or a header can be
soldered carefully on to this location, allowing the
User to take advantage of the on board USB port
of the PIC32 Processor.
Note: This is not the same USB that is present
down the bottom left of the PICadillo-35T.
For more information on this USB Port, please
refer to the Datasheet for the PIC32 from the
Microchip website.
8. Display Features
Display – 3.5” TFT Touch Screen
8.1.
The PICadillo-35T module is equipped with a 3.5”
TFT display. Details of the display are listed below:
Screen Size: 3.5” diagonal, 320x480 resolution,
65K colours
65K colours
Integrated 4-Wire Resistive Touch Screen
Screen Dimensions: 54.5 x 83.0 x 3.35mm
Viewing Area: 49.76 x 77.04mm
Pixel Pitch: 0.153(H) x 0.153(V)mm
Brightness: 220cd/m2
Contrast Ratio: 500:1
Viewing Angle Above Centre: 60 degrees
Viewing Angle Below Centre: 60 degrees
Viewing Angle Left of Centre: 70 degrees
Viewing Angle Right of Centre: 70 degrees
Viewing Direction: 6 O'clock
7 LEDs for Backlighting