EP9301-CQ Cirrus Logic Inc, EP9301-CQ Datasheet - Page 739
![IC ARM920T MCU 166MHZ 208-LQFP](/photos/12/23/122383/mfg_ep9301_parts_sml.jpg)
EP9301-CQ
Manufacturer Part Number
EP9301-CQ
Description
IC ARM920T MCU 166MHZ 208-LQFP
Manufacturer
Cirrus Logic Inc
Series
EP9r
Datasheets
1.EDB9301.pdf
(5 pages)
2.EDB9301.pdf
(4 pages)
3.EP9307-CRZ.pdf
(824 pages)
4.EP9301-IQ.pdf
(41 pages)
Specifications of EP9301-CQ
Core Processor
ARM9
Core Size
16/32-Bit
Speed
166MHz
Connectivity
EBI/EMI, Ethernet, I²C, IrDA, SPI, UART/USART, USB
Peripherals
AC'97, DMA, I²: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
0°C ~ 70°C
Package / Case
208-LQFP
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Eeprom Size
-
Program Memory Size
-
Other names
598-1248
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
EP9301-CQZ
Manufacturer:
CIRRUS
Quantity:
3 390
Part Number:
EP9301-CQZ
Manufacturer:
CIRRUSLOGIC
Quantity:
20 000
Company:
Part Number:
EP9301-CQZR
Manufacturer:
Cirrus Logic Inc
Quantity:
10 000
- EDB9301 PDF datasheet
- EDB9301 PDF datasheet #2
- EP9307-CRZ PDF datasheet #3
- EP9301-IQ PDF datasheet #4
- Current page: 739 of 824
- Download datasheet (13Mb)
DS785UM1
25.1 Introduction
25.2 Touch Screen Controller Operation
The touch screen controller is a hardware engine that controls scanning for 4, 5, 7, or 8-wire
analog resistive touch screens (TS). The engine performs all sampling, averaging, and range
checking for analog-to-digital converter values. The hardware engine also controls an analog
switch array for controlling the different scan modes.
Through the APB interface, it is possible to disable the touch screen hardware engine and
directly control the switch matrix and the analog-to-digital converter. This allows for the
implementation of more complex software scanning algorithms if desired. However, the
hardware engine provides all features necessary to implement a standard interface and
eliminates almost all ARM Core intervention in the scanning process.
For both X and Y axes, the touch screen controller engine does the following:
Many touch screen controllers send a continuous information stream to the processor when
the touch screen is in use. This controller, in contrast, only interrupts the ARM Core when the
stimulus change is significant.
To understand the controller operation, it is first important to understand the electrical
implementation of touch screen technologies. The schematics for various resistive touch
screen technologies are shown in
layers are pressed together, a resistive contact is made.
Note: The EP9301 and EP9302 processors each support a general 5-bit ADC, but no touch
Note: The EP9307, EP9312, and EP9315 processors each support up to an 8-wire touch
• Takes 4, 8, 16, or 32 sample sets.
• Checks to see if the deviation in the sample set is too great.
• Averages the samples.
• Checks the average to see if the move is too great to be realistic.
• Checks to see if the move is large enough to bother the ARM Core.
screen .
screen or a general 12-bit ADC.
Copyright 2007 Cirrus Logic
25Analog Touch Screen Interface
Figure
25-1. When the front and back indium-tin-oxide
Chapter 25
25-1
25
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