EP9307-CR Cirrus Logic Inc, EP9307-CR Datasheet - Page 741
![IC,MICROPROCESSOR,32-BIT,CMOS,BGA,272PIN,PLASTIC](/photos/12/23/122386/ep9307-cr_sml.jpg)
EP9307-CR
Manufacturer Part Number
EP9307-CR
Description
IC,MICROPROCESSOR,32-BIT,CMOS,BGA,272PIN,PLASTIC
Manufacturer
Cirrus Logic Inc
Series
EP9r
Specifications of EP9307-CR
Rohs Compliant
NO
Core Processor
ARM9
Core Size
16/32-Bit
Speed
200MHz
Connectivity
EBI/EMI, Ethernet, I²C, IrDA, Keypad/Touchscreen, SPI, UART/USART, USB
Peripherals
AC'97, DMA, I²:S, LCD, LED, MaverickKey, POR, PWM, WDT
Number Of I /o
14
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
272-TFBGA
Processor Series
EP93xx
Core
ARM920T
Data Bus Width
32 bit
3rd Party Development Tools
MDK-ARM, RL-ARM, ULINK2
Development Tools By Supplier
EDB9307A-Z
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
For Use With
598-1133 - KIT DEVELOPMENT EP9307 ARM9
Eeprom Size
-
Program Memory Size
-
Lead Free Status / Rohs Status
No
Other names
598-1254
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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
-
-
-
-
-
-
-
-
-
-
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-
-
-
-
-
EP93xx User’s Guide
25-3
25
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