MIKROE-972 mikroElektronika, MIKROE-972 Datasheet - Page 31

• Manufacturer Part Number: MIKROE-972
• Description: Development Boards & Kits - ARM EASYMX PRO v7 ARM STELLARIS CORTEX-M3
• Manufacturer: mikroElektronika

Specifications of MIKROE-972

• Rohs: yes
• Product: Development Boards
• Tool Is For Evaluation Of: LM3S9B95
• Core: ARM Cortex M3
• Interface Type: CAN, I2C, SPI
• Operating Supply Voltage: 7 VAC to 23 VAC, 9 VDC to 32 VDC

EasyMx PRO
Touch Panel
controller
Touch panel is a glass panel whose surface is covered
with two layers of resistive material. When the screen is
pressed, the outer layer is pushed onto the inner layer
and appropriate controllers can measure that pressure
and pinpoint its location. This is how touch panels can be
used as an input devices. EasyMx PRO
Enabling Touch panel
Touch panel is enabled using SW14.5,
SW14.6, SW14.7 and SW14.8 switches.
They connect READ-X and READ-Y lines of
the touch panel with PB4 and PB5 analog
inputs, and DRIVEA and DRIVEB with PE0
and PE1 digital outputs on microcontroller
sockets. Make sure to disconnect other
peripherals, LEDs and additional pull-up or pull-
down resistors from the interface lines so they
do not interfere with signal/data integrity.
v7
Figure 17-2:
Turn on
switches 5
through 8 on
SW14 to enable
Touch panel
controller
™
v7 for Stellaris
®
is
VCC-3.3V
equipped with touch panel controller and connector for
4-wire resistive touch panels. It can very accurately
register pressure at a specific point, representing the
touch coordinates in the form of analog voltages, which
can then be easily converted to X and Y values. Touch
panel comes as a part of TFT 320x240 display.
TFT1
Figure 17-1: Touch Panel controller
and connection schematic
DATA BUS
RIGHT
TOP
READ-X
READ-Y
VREF
R79
100K
R85
100K
Q3
BC856
Q8
BC856
VREF
R64
10K
C29
10nF
C30
10nF
PB4
PB5
PE0
PE1
R63
1K
R68
10K
VCC-1.8V
Q4
BC846
Q9
BC846
Q11
BC846
SW14
R65
10K
R80
10K
R86
10K
FERRITE
FP4
VCC-3.3V
VCC-3.3V
VCC-3.3V
VREF
READ-X
READ-Y
DRIVEA
DRIVEB
R67
4K7
E15
10uF
R84
4K7
page 31
E13
10uF
DRIVEB
DRIVEA