EP9312-IBZ Cirrus Logic Inc, EP9312-IBZ Datasheet - Page 743

• Manufacturer Part Number: EP9312-IBZ
• Description: IC ARM920T MCU 200MHZ 352-PBGA
• Manufacturer: Cirrus Logic Inc
• Series: EP9r

Specifications of EP9312-IBZ

• Core Size: 16/32-Bit
• Package / Case: 352-BGA
• Core Processor: ARM9
• Speed: 200MHz
• Connectivity: EBI/EMI, EIDE, Ethernet, I²C, IrDA, Keypad/Touchscreen, 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: -40°C ~ 85°C
• Controller Family/series: (ARM9)
• A/d Converter: 12 Bits
• No. Of I/o Pins: 65
• Clock Frequency: 200MHz
• Processor Series: EP93xx
• Core: ARM920T
• Data Bus Width: 32 bit
• 3rd Party Development Tools: MDK-ARM, RL-ARM, ULINK2
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Program Memory Size: -
• Lead Free Status / Rohs Status: Details
• Other names: 598-1260

DS785UM1
SX+
SY+
SX-
SY-
X+
Y+
array scanning and enable the state machine. In determining a touch point, the first axis to be
scanned is the X-axis. X and Y axis definitions are arbitrary and must only be coordinated
with the code when determining a screen position. For 8-wire and 4-wire implementations,
the touch screen X and Y axis positioning should be linear for all checking algorithms to work
linearly. The algorithm and the returned values will not be linear for a 5-wire touch screens or
7-wire (5-wires with feedback) touch screens and must be adjusted by software to determine
screen position. Some newer technology 5-wire touch screens approach linearity and will
need to be adjusted differently in software.
The same algorithm for sampling is used by 4, 5, 7, and 8-wire touch screens. However, the
switch combinations controlled by the algorithm are determined by configuration registers.
The configuration registers are set up by software according to the touch screen type.
Table 25-2
X-
Y-
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
TOUCH_PRESS
VDD
details the configuration values required for 4-, 5-, 6-, and 8-wire touch screens.
SW10
SW9
A/D CONVERTER
SW30
SW29
SW8
REF+
REF-
IN
VBAT
Figure 25-2. 8-Wire Resistive Interface Switching Diagram
DAC
SX+
SY+
SX-
SY-
X+
Y+
X-
Y-
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
SW10
SW9
A/D CONVERTER
REF-
REF+
IN
SX+
SY+
SX-
SY-
X+
Y+
X-
Y-
100K
100K
SAMPLE X-AXIS
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
Analog Touch Screen Interface
SX+
SY+
SX-
SY-
X+
Y+
X-
Y-
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
EP93xx User’s Guide
VDD
SW10
SW9
A/D CONVERTER
REF+
REF-
IN
25-5
25