EP9315-CB Cirrus Logic Inc, EP9315-CB Datasheet - Page 750

• Manufacturer Part Number: EP9315-CB
• Description: IC ARM920T MCU 200MHZ 352-PBGA
• Manufacturer: Cirrus Logic Inc
• Series: EP9r

Specifications of EP9315-CB

• Core Processor: ARM9
• Core Size: 16/32-Bit
• Speed: 200MHz
• Connectivity: EBI/EMI, EIDE, Ethernet, I²C, IrDA, Keypad/Touchscreen, PCMCIA, SPI, UART/USART, USB
• Peripherals: AC'97, DMA, I&sup2:S, LCD, LED, MaverickKey, POR, PWM, WDT
• Number Of I /o: 16
• Program Memory Type: ROMless
• Ram Size: 32K x 8
• Voltage - Supply (vcc/vdd): 1.65 V ~ 3.6 V
• Data Converters: A/D 8x12b
• Oscillator Type: External
• Operating Temperature: 0°C ~ 70°C
• Package / Case: 352-BGA
• Processor Series: EP93xx
• Core: ARM920T
• Data Bus Width: 32 bit
• 3rd Party Development Tools: MDK-ARM, RL-ARM, ULINK2
• Development Tools By Supplier: EDB9315A-Z
• For Use With: 598-1144 - KIT DEVELOPMENT EP9315 ARM9
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -
• Program Memory Size: -
• Lead Free Status / Rohs Status: No
• Other names: 598-1261

25
25-12
Not Used
Analog Touch Screen Interface
EP93xx User’s Guide
25.2.3 Direct Operation
Wiper
sV+
Z+/-
Z-/+
sV-
V+
V-
When the touch screen controller is disabled (TSSetup.ENABLE low), the ARM Core has
direct control of the analog switch array through the TSDirect register. The full 12-bit output of
the analog-to-digital converter can also be read from the TSXYResult register when the touch
screen engine is disabled. Please note that the initial read value should be viewed as a
convert command where the data provided is stale and should be discarded. After the
conversion time for the A / D converter, the actual value may be read. This also sets off
another convert command.
The next few figures demonstrate some special functions that can be implemented with direct
ARM Core control of the switch array. The touch screen can be set up in a way that it can be
disabled for low power mode and still have the ability to interrupt the ARM Core.
shows how to detect a key press in either 4 / 8-wire or 5-wire installations with the touch
screen controller disabled. The TOUCH_PRESS signal in the figure is gated into the interrupt
logic when the touch screen controller is disabled and in low power mode. In this mode, the
clock to the module can be disabled and interrupts will still be generated. The low-power
mode should be entered and exited with the touch screen interrupt disabled, as the
asynchronous operation of this logic could cause glitches on the interrupt line. Entering the
low-power state with interrupts enabled may trigger false interrupts.
TOUCH DETECT
100K
100K
SW28
SW22
SW23
SW19
SW11
SW20
SW13
SW21
SW12
SW14
SW24
SW25
SW26
SW27
SW15
SW16
SW17
SW18
SW0
SW1
SW2
SW3
SW4
SW5
SW6
SW7
Figure 25-6. 5-Wire Feedback (7-Wire) Analog Resistive Interface Switching Diagram
VDD
TOUCH_PRESS
SW10
SW9
A/D CONVERTER
SW30
SW29
SW8
REF-
REF+
IN
VBAT
DAC
Not Used
Wiper
Z+/-
Z-/+
sV+
sV-
V+
V-
DISCHARGE ALL LINES
100K
100K
SW22
SW23
SW19
SW11
SW20
SW13
SW21
SW12
SW14
SW24
SW25
SW26
SW27
SW15
SW16
SW17
SW18
SW0
SW1
SW2
SW3
SW4
SW5
SW6
SW7
Copyright 2007 Cirrus Logic
VDD
SW9
SW10
A/D CONVERTER
REF+
REF-
IN
Not Used
Wiper
Z+/-
Z-/+
sV+
V+
sV-
V-
SAMPLE X-AXIS
100K
100K
SW22
SW23
SW19
SW11
SW20
SW13
SW21
SW12
SW14
SW24
SW25
SW26
SW27
SW15
SW16
SW17
SW18
SW0
SW1
SW2
SW3
SW4
SW5
SW6
SW7
VDD
SW10
SW9
A/D CONVERTER
REF-
REF+
IN
Not Used
Wiper
Z+/-
Z-/+
V+
sV+
V-
sV-
SAMPLE Y-AXIS
100K
100K
SW22
SW23
SW19
SW11
SW20
SW13
SW21
SW12
SW14
SW24
SW25
SW26
SW27
SW15
SW16
SW17
SW18
SW0
SW1
SW2
SW3
SW4
SW5
SW6
SW7
Figure 25-7
VDD
DS785UM1
SW10
SW9
A/D CONVERTER
REF+
REF-
IN