EP9312-IB Cirrus Logic Inc, EP9312-IB Datasheet - Page 740

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

Specifications of EP9312-IB

• Core Processor: ARM9
• Core Size: 16/32-Bit
• 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
• Package / Case: 352-BGA
• Processor Series: EP93xx
• Core: ARM920T
• Data Bus Width: 32 bit
• 3rd Party Development Tools: MDK-ARM, RL-ARM, ULINK2
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -
• Program Memory Size: -
• Lead Free Status / Rohs Status: No
• Other names: 598-1259

25
25-2
Analog Touch Screen Interface
EP93xx User’s Guide
4 WIRE ANALOG RESISTIVE TOUCH SCREEN SCHEMATIC
X+
Y+
X-
Y-
Wiper
5 WIRE ANALOG RESISTIVE TOUCH SCREEN SCHEMATIC
Z+/-
Z-/+
For 8- and 4-wire touch screens, the point at which the contact is made can be determined by
measuring a voltage driven between the bus bars on the X-axis layer through either or both of
the Y lines, and by then measuring a voltage driven between the bus bars on the Y-axis layer
through either or both of the X lines. By comparing these voltages to values determined
during calibration, the location of the touch can be determined.
V+
V-
Figure 25-1. Different Types of Touch Screens
Copyright 2007 Cirrus Logic
Wiper
SX+
SY+
SX-
SY-
8 WIRE ANALOG RESISTIVE TOUCH SCREEN SCHEMATIC
X+
Y+
X-
Y-
sV+
Z+/-
Z-/+
sV-
7 WIRE (5 WIRE WITH FEEDBACK) ANALOG RESISTIVE
V+
V-
TOUCH SCREEN SCHEMATIC
DS785UM1