EP9302-IQZ Cirrus Logic Inc, EP9302-IQZ Datasheet - Page 741

• Manufacturer Part Number: EP9302-IQZ
• Description: IC ARM9 SOC PROCESSOR 208LQFP
• Manufacturer: Cirrus Logic Inc
• Series: EP9r

Specifications of EP9302-IQZ

• Core Size: 16/32-Bit
• Core Processor: ARM9
• Speed: 200MHz
• Connectivity: EBI/EMI, Ethernet, I²C, IrDA, SPI, UART/USART, USB
• Peripherals: AC'97, DMA, I&sup2:S, LED, MaverickKey, POR, PWM, WDT
• Number Of I /o: 19
• Program Memory Type: ROMless
• Ram Size: 32K x 8
• Voltage - Supply (vcc/vdd): 1.65 V ~ 3.6 V
• Data Converters: A/D 5x12b
• Oscillator Type: External
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 208-LQFP
• Controller Family/series: (ARM9)
• No. Of I/o's: 19
• Ram Memory Size: 16MB
• Cpu Speed: 200MHz
• No. Of Timers: 3
• No. Of Pwm Channels: 1
• Digital Ic Case Style: LQFP
• Embedded Interface Type: AC97, I2S, SPI, UART, USB
• Rohs Compliant: Yes
• Processor Series: EP93xx
• Core: ARM920T
• Data Bus Width: 32 bit
• Mounting Style: SMD/SMT
• 3rd Party Development Tools: MDK-ARM, RL-ARM, ULINK2
• Development Tools By Supplier: EDB9302A-Z
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: 598-1132 - KIT DEVELOPMENT EP9302 ARM9
• Eeprom Size: -
• Program Memory Size: -
• Lead Free Status / Rohs Status: Details
• Other names: 598-1253

DS785UM1
For 8-wire touch screens, the SX and SY lines are used as the measurement reference for
the analog-to-digital converter to provide better resolution during a reading and compensate
for any drift in samples due to other factors. A 4-wire analog resistive touch screen is the
same as an 8-wire without the SX and SY feedback lines. A 4-wire analog resistive touch
screen may be adequate for non-industrial use or small touch screens.
For 5-wire touch screens and 7-wire (5-wires with feedback) touch screens, a constant
voltage is applied from corner to corner of the lower layer. Switching of the X and Y axis is
performed by driving appropriate voltages on Z+/- and Z-/+. The location values during both
the X and Y scans are then read by sampling the Wiper input. A 7-wire touch screen (5-wires
with feedback), provides reference feedback voltages to the analog-to-digital converter to
eliminate analog switch and other circuit resistances.
The changes in connection for sampling are performed by a set of separately controlled
analog switches. These switches may be connected in a variety of ways which allows a high
degree of flexibility in using the analog-to-digital converter. To avoid contention, each switch
drive circuit has a much faster turn-off than turn-on to provide an overall break-before-make
array function.
Logic safeguards are included to condition the control signals for power connection to the
matrix to prevent part damage. In addition, a software lock register is included that must be
written with 0xAA before each register write to change the values of the four switch matrix
control registers.
Table 25-1
prevent physical part damage. A “1” in the register bit position closes the corresponding
switch.
Switc
Bit 10
Bit 11
Bit 12
Bit 13
Bit 14
Bit 15
Bit 16
Bit 17
CTL
Bit 0
Bit 1
Bit 2
Bit 3
Bit 4
Bit 5
Bit 6
Bit 7
Bit 8
Bit 9
Table 25-1. Switch Definitions and Logical Safeguards to Prevent Physical Damage
provides switch definitions and the logical safeguards that are implemented to
h
Connection
AGND
From
AVDD
VBAT
sY+
sX+
sX+
sY+
sX-
sX-
sY-
X+
Y+
X+
Y+
X-
X-
Y-
Y-
Copyright 2007 Cirrus Logic
Connection
ADC REF+
ADC REF-
ADC input
ADC input
ADC input
ADC input
ADC input
ADC input
ADC input
ADC input
ADC input
AGND
AGND
AGND
AGND
AGND
AGND
AGND
To
SW9 = HIGH and SW26 = LOW and SW24 = LOW
SW8 = HIGH and the bus SW[7-0] = 0x00
Only allowed if
Analog Touch Screen Interface
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
EP93xx User’s Guide
25-3
25