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Texas Instruments ADS7845EVM/ADS7845EVM-PDK User guides
User's Guide
SBAU122 – March 2006
ADS7845EVM and ADS7845EVM-PDK
This user's guide describes the characteristics, operation, and use of the
ADS7845EVM, both by itself and as part of the ADS7845EVM-PDK. This device is a
5-wire touch screen controller evaluation module (EVM) which also has an auxiliary
input measurement capability. A complete circuit description, schematic diagram, and
bill of materials are included.
The following related documents are available through the Texas Instruments web site
at www.ti.com.
EVM-Compatible Device Data Sheets
1
2
3
4
5
6
7
Device
Literature
Number
ADS7845
SBAS104
REF3125
SBVS046
TAS1020B
SLES025
REG1117-5
SBVS001
TPS767D318
SLVS209
SN74LVC125A
SCAS290
SN74LVC1G125
SCES223
SN74LVC1G07
SCES296
Contents
EVM Overview ............................................................................................................... 2
Analog Interface.............................................................................................................. 2
Digital Interface .............................................................................................................. 3
Power Supplies .............................................................................................................. 3
EVM Operation ............................................................................................................... 5
Kit Operation ................................................................................................................. 5
EVM Bill of Materials and Schematic .................................................................................... 10
List of Figures
1
2
ADS7845EVM-PDK Block Diagram ...................................................................................... 6
Default Software Screen ................................................................................................... 8
List of Tables
1
2
3
4
5
6
Analog Interface Pinout ..................................................................................................... 2
Digital Interface Pinout ...................................................................................................... 3
Power Supply Pinout ........................................................................................................ 3
List of Jumpers ............................................................................................................... 5
ADS7845EVM Bill of Materials ........................................................................................... 10
USB-MODEVM Bill of Materials .......................................................................................... 11
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EVM Overview
1
EVM Overview
1.1
Features
•
•
Full-featured evaluation board for the ADS7845 5-wire, resistive touch screen controller (TSC)
Modular design for use with a variety of DSP and microcontroller interface boards
The ADS7845EVM-PDK is a complete evaluation kit, which includes a USB-based motherboard and
evaluation software for use with a personal computer running Microsoft Windows™ operating systems
(Windows 2000 or higher).
1.2
Introduction
The ADS7845EVM is in Texas Instruments' modular EVM form factor, which allows direct evaluation of
the ADS7845 performance and operating characteristics, and eases software development and system
prototyping. This EVM is compatible with the 5-6K Interface Board (SLAU104) and the HPA-MCU
Interface Board (SLAU106) from Texas Instruments and additional third-party boards such as the HPA449
demonstration board from SoftBaugh, Inc. (www.softbaugh.com).
The ADS7845EVM-PDK is a complete evaluation/demonstration kit, which includes a USB-based
motherboard called the USB-MODEVM Interface Board and evaluation software for use with a personal
computer running Microsoft Windows operating systems.
2
Analog Interface
For maximum flexibility, the ADS7845EVM is designed for easy interfacing to multiple analog sources.
Samtec part numbers SSW-110-22-F-D-VS-K and TSM-110-01-T-DV-P provide a convenient 10-pin,
dual-row, header/socket combination at J1. This header/socket provides access to the analog input pins of
the TSC. Consult Samtec at www.samtec.com or call 1-800-SAMTEC-9 for a variety of mating connector
options.
Table 1. Analog Interface Pinout
Pin Number
Signal
Description
J1.2
UL
Touch screen Upper Left (UL) electrode
J1.4
LL
Touch screen Lower Left (LL) electrode
J1.6
UR
Touch screen Upper Right (UR) electrode
J1.8
LR
Touch screen Lower Right (LR) electrode
J1.10
WIPER
Touch screen Wiper electrode
J1.12
AUXIN
Auxiliary input, 0V to VREF
J1.14
Unused
J1.16
Unused
J1.18
REF(–)
Tied to analog ground
J1.20
REF(+)
External reference source input (2.5V NOM)
J1.15
Unused
J1.11-J1.19 (odd)
AGND
Analog ground connections (except J1.15)
Microsoft Windows is a trademark of Microsoft Corporation.
SPI is a trademark of Motorola, Inc.
NI-VISA is a trademark of National Instruments.
I2C, I2S are trademarks of Royal Philips Electronics B.V., The Netherlands.
WinZip is a trademark of WinZip Computing, Inc..
All trademarks are the property of their respective owners.
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Digital Interface
3
Digital Interface
The ADS7845EVM is designed to easily interface with multiple control platforms. Samtec part numbers
SSW-110-22-F-D-VS-K and TSM-110-01-T-DV-P provide a convenient 10-pin, dual-row, header/socket
combination at J2. This header/socket provides access to the digital control and serial data pins of the
TSC. Consult Samtec at www.samtec.com or call 1-800-SAMTEC-9 for a variety of mating connector
options.
Table 2. Digital Interface Pinout
4
Pin Number
Signal
J2.1
Unused
Description
J2.2
BUSY
TSC busy flag
J2.3
SCLK
Serial clock
J2.4
DGND
Digital ground
J2.5
SCLKR
Serial clock return (for DSP host systems)
J2.6
Unused
J2.7
SS
J2.8
Unused
J2.9
FSR
Frame sync return (for DSP host systems)
J2.10
DGND
Digital ground
J2.11
MOSI
Serial data input to TSC from host
J2.12
Unused
J2.13
MISO
J2.14
Unused
J2.15
PENIRQ
Pen interrupt output from TSC
J2.16
SCL
I2C bus serial clock
J2.17
Unused
J2.18
DGND
J2.19
Unused
J2.20
SDA
Slave select - Active low signal, enables data transfer. Frame sync on DSP host systems.
Serial data output from TSC to host
Digital ground
I2C bus data line
Power Supplies
J3 provides connection to the common power bus for the ADS7845EVM. Power is supplied on the pins
listed in Table 3.
Table 3. Power Supply Pinout
Signal
Pin Number
Signal
Unused
1
2
Unused
+5VA
3
4
Unused
DGND
5
6
AGND
Unused
7
8
+VD1
+3.3VD
9
10
Unused
When power is supplied to J3, JMP4 allows for one of three different DC voltages to be used as the power
supply of the ADS7845. See the schematic and printed circuit board silkscreen for details.
The ADS7845EVM-PDK motherboard (the USB-MODEVM Interface Board) supplies power to J3 of the
ADS7845EVM. Power for the motherboard is supplied either through its USB connection or on terminal
blocks on the board.
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Power Supplies
4.1
TSC Power
Power for the ADS7845 VCC can be supplied either from +5V or from +3.3V. JMP4 selects which of these
voltages is routed to the ADS7845. When JMP4 is in the default factory condition (shunt on pins 5-6),
power to the TSC comes from J3.3 (+5VA). When the shunt is installed on JMP4 pins 3-4, power comes
from J3.9 (+3.3VD). A third supply option is to place a shunt on JMP4 pins 1-2, and supply a voltage from
J3.8 (VD1), which must be within the specified operating range of the ADS7845.
4.2
Stand-Alone Operation
When used as a stand-alone EVM, the analog power can be applied to TP1, referenced to TP2.
CAUTION
Verify that all power supplies are within the safe operating limits shown on
the ADS7845 data sheet before applying power to the EVM.
4.3
USB-MODEVM Interface Power
The USB-MODEVM Interface Board can be powered from several different sources:
• USB
• 6VDC-10VDC AC/DC wall supply (not included)
• Laboratory power supply
When powered from the USB connection, JMP6 should have a shunt from pins 1-2 (this is the default
factory configuration). When powered from 6V-10VDC, either through the J8 terminal block or J9 barrel
jack, JMP6 should have a shunt installed on pins 2-3. If power is applied in any of these ways, onboard
regulators generate the required supply voltages and no further power supplies are necessary.
If laboratory supplies are used to provide the individual voltages required by the USB-MODEVM Interface
Board, JMP6 should have no shunt installed. Voltages are then applied to J2 (+5VA), J3 (+5VD), J4
(+1.8VD), and J5 (+3.3VD). The +1.8VD and +3.3VD can also be generated on the board by the onboard
regulators from the +5VD supply; to enable this option, the SW1 switches need to be set in the ON
position (lower position, looking at the board with text reading right-side up) to enable the regulators. If
+1.8VD and +3.3VD are supplied externally, disable the onboard regulators by placing the SW1 switches
in the OFF position.
Each power-supply voltage has an LED (D1-D7) that lights when the power supplies are active.
4.4
Reference Voltage
The ADS7845 requires a voltage reference. An external reference may be supplied through J1 pin 20 on
the ADS7845EVM, referenced to analog ground (J1 pin 18 on the ADS7845EVM). JMP1 must be installed
across positions 5-6 in order to route this external reference voltage to the ADS7845.
CAUTION
Verify that the external reference voltage is within the safe operating limits
shown on the ADS7845 data sheet before applying power to the EVM.
A 2.5V reference is supplied on the ADS7845EVM, and can be selected for use by connecting JMP1 pins
3-4. Alternatively, the supply voltage can be used as the voltage reference by connecting pins 1-2 on
JMP1.
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EVM Operation
5
EVM Operation
The following section provides information on the analog input, digital control, and general operating
conditions of the ADS7845EVM.
5.1
Analog Input
The analog input sources (touch screen and auxiliary input) can be applied directly to J1 (top side or
bottom side) or through signal-conditioning modules available for the modular EVM system.
5.2
Digital Control
The digital control signals can be applied directly to J2 (top side or bottom side). The modular
ADS7845EVM can also be connected directly to a DSP or microcontroller interface board, such as the
HPA449, or to the USB-MODEVM Interface Board if purchased as part of the ADS7845EVM-PDK. For a
current list of compatible interface and/or accessory boards for the EVM or the ADS7845, see the relevant
product folder on the TI web site.
5.3
Default Jumper Locations
Table 4 provides a list of jumpers found on the EVM and the factory default conditions for each one.
Table 4. List of Jumpers
6
Jumper
Shunt Position
Jumper Description
JMP1
3-4
Selects reference voltage source to ADS7845. 1-2 selects VCC, 3-4 selects the
onboard 2.5V reference, and 5-6 selects the external reference voltage from J1.20.
JMP2
CLOSED
Connects analog ground (AGND) to digital ground (DGND).Default is connected.
JMP3
CLOSED
EEPROM Address Select - when installed and used with the USB-MODEVM, firmware
for the motherboard is executed from the EEPROM on board the ADS7845EVM. This
is the default mode.
JMP4
5-6
Analog Power Select (default is +5VA)
Kit Operation
The following section provides information on using the ADS7845EVM-PDK, including setup, program
installation, and program usage.
6.1
ADS7845EVM-PDK Block Diagram
A block diagram of the ADS7845EVM-PDK is shown in Figure 1. The evaluation kit consists of two circuit
boards connected together. The motherboard is designated as the USB-MODEVM Interface Board, while
the daughtercard is the ADS7845EVM described previously in this manual.
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Kit Operation
ADS7845EVM
X+
MOSI
XY+
MISO
SCLK
SS
ADS7845
Y-
PENIRQ
VBAT
AUX
EVM Position 1
Control Interface
2
SPI, I C
TAS1020B
USB 8051
Microcontroller
EVM Position 2
USB
2
I S, AC97
Audio Interface
Figure 1. ADS7845EVM-PDK Block Diagram
The USB-MODEVM Interface Board is intended to be used in USB mode, where control of the installed
EVM is accomplished using the onboard USB controller device. Provision is made, however, for driving all
the data buses (I2C™, SPI™, I2S™/AC97) externally. The source of these signals is controlled by SW2 on
the USB-MODEVM.
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Kit Operation
6.2
Quick Start
Ensure that the ADS7845EVM is installed on the USB-MODEVM Interface Board. The ADS7845EVM
should be installed in the topmost position, using J11, J12, and J13 on the USB-MODEVM.
Place the CD-ROM into your PC CD-ROM drive. Locate the Setup program on the disk and execute it.
The Setup program installs the ADS7845 evaluation software on your PC. Follow the instructions and
prompts given.
After the main program is installed, a dialog box appears with instructions for installing NI-VISA 3.2
Runtime, a self-extracting archive. Click OK to proceed. A WinZip™ dialog appears. Click Unzip, and the
archive extracts itself and automatically runs the NI-VISA™ 3.2 Runtime installer.
Follow the instructions in the NI-VISA 3.1 Runtime Installer. When prompted for which features to install,
do the following:
1. Click on the disk icon next to NI-VISA 3.2
2. Select, Do not install this feature.
3. Click on the disk icon next to USB.
4. Select the option which installs this feature.
5. Click Next.
Accept the license agreement, and continue the installation.
When the installation completes, click Finish on the ADS7845EVM installer window. You may be prompted
to restart your computer.
When installation is complete, attach a USB cable from your PC to the USB-MODEVM Interface Board. As
configured at the factory, the board will be powered from the USB interface, so the power indicator LEDs
on the USB-MODEVM should light. Once this occurs, launch the ADS7845 evaluation software on your
PC.
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Kit Operation
The software should automatically find the ADS7845EVM, and a screen similar to the one in Figure 2
should appear.
Figure 2. Default Software Screen
In order to use the touch screen features, a 5-wire, resistive touch screen must be connected to J1 of the
ADS7845EVM, as described previously.
6.3
USB-MODEVM Interface Board
The simple diagram shown in Section 6.1 shows only the basic features of the USB-MODEVM Interface
Board. The board is designed for a TAS1020B streaming audio USB controller with an 8051-based core. It
features two positions for modular EVMs, or one double-wide serial modular EVM may be installed.
For use with the ADS7845, the ADS7845EVM is installed in the topmost EVM slot, which connects the
ADS7845 digital control interface to the SPI port, realized using the TAS1020B. Because the ADS7845
has no audio features, the lower EVM slot (which is connected to the TAS1020B digital audio interface) is
not used.
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Kit Operation
As configured from the factory, the board is ready to use with the ADS7845EVM. However, if external SPI
control is desired, the signals may be applied to J15, as long as the SW2 is set so that USB SPI control is
disabled. To view all the functions and configuration options available on this board, see the
USB-MODEVM Interface Board schematic in Section 7.2.
6.4
Program Description
After the ADS7845EVM-PDK software installation (described in Section 6.2), evaluation and development
with the ADS7845 can begin.
6.4.1
Touch Screen Functions Panel
The touch screen box in this panel is updated when a touch is detected on the touch screen. As the touch
screen is drawn on, the motion on the touch screen is translated into pixels on this box. The software
takes X and Y readings which are shown to the right of the touch screen box.
The display can be cleared by pressing the Clear Graph button on the screen.
6.4.2
Data Acquisition Functions Panel
The ADS7845 provides for measuring an auxiliary input voltage. A data acquisition functions panel
displays the measured value for this parameter. Measurements are updated only when the touch screen is
not being pressed. Note that these measurements depend on the reference voltage and are affected by
the setting of the power-down bits. The software presumes that the reference voltage is 2.5V.
6.4.3
Configuration Panel
The ADS7845 can be configured to operate in either 8-bit or 12-bit resolution mode. This panel controls
the mode selection.
Touch screen measurements may be made in either single-ended or differential mode; see the ADS7845
data sheet for a discussion of these modes. The touch screen measurement mode may also be selected
in this panel. If single-ended mode is used, ensure that a reference voltage is supplied; however,
single-ended measurements are discouraged for touch screen use, because differential mode yields far
more accurate results.
The two power-down bits of the ADS7845 can also be set from this panel. A brief description of the mode
selected is shown on the screen when setting these bits; see Table V of the ADS7845 data sheet for
details on the functions of these bits.
6.4.4
Datalogging
The software can record the data it is taking from the ADS7845 to a tab-delimited file, suitable for
importing into spreadsheets. To do this, first go into the File menu, and select Log Data to File..., which
opens a file-select window and allows you to specify a file to which to write the data. At the same time,
this feature enables the Datalogging menu.
When ready to begin recording data to a file, select Datalogging → Start Logging. Data is written to the file
until Datalogging → Stop Logging is selected. When the screen is not touched, the AUX values are written
to the file, and the X and Y parameters are written to the file with values of 9999, to indicate that they are
not updated. When the screen is touched, the X and Y parameters are written while the AUX values are
written to the file as 9999. Because the program constantly updates at a rate of about 400 readings per
second, datalog files can quickly grow large; therefore, log only what is necessary.
The format of the data file has the first column as the time in milliseconds (just a timer in the program,
which can arbitrarily start at any number), then X, Y, and AUX columns. Every new reading is a new row
in the file.
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EVM Bill of Materials and Schematic
7
EVM Bill of Materials and Schematic
The following tables contain a complete bill of materials for the modular ADS7845EVM and the
USB-MODEVM Interface Board (included only in the ADS7845EVM-PDK).
Table 5. ADS7845EVM Bill of Materials
10
Designators
Description
Manufacturer
Mfg. Part Number
R1, R2, R3, R4, R5
0Ω 1/8W 5% Chip Resistor
Panasonic
ERJ-6GEY0R00V
R7, R8
33Ω 1/8W 5% Chip Resistor
Panasonic
ERJ-6GEYJ330V
R6
100Ω 1/8W 5% Chip Resistor
Panasonic
ERJ-6GEYJ101V
R9, R10, R11
2.7KΩ 1/8W 5% Chip Resistor
Panasonic
ERJ-6GEYJ272V
R12
10KΩ 1/8W 5% Chip Resistor
Panasonic
ERJ-6GEYJ103V
C8
0.47µF 10V Ceramic Chip
Capacitor, ±10%, X5R
TDK
C1608X5R1A474KT
C10, C11
1µF 25V Ceramic Chip Capacitor, TDK
±10%, X5R
C2012X5R1E105KT
C7, C9
10µF 16V Ceramic Chip
Capacitor, ±20%, X5R
TDK
C3216X5R1C106MT
C1, C2, C3, C4, C5, C6
Chip Capacitor - Not Installed
U1
Touch Screen Controller, 5-Wire
Resistive
Texas Instruments
ADS7845E
U3
2.5V Precision Voltage Reference Texas Instruments
I2C
EEPROM
REF3125AIDBZ
U2
64K
MicroChip
24LC64-I/SN
J1A, J2A
20-pin SMT Plug
Samtec
TSM-110-01-L-DV-P
J1B, J2B
20-pin SMT Socket
Samtec
SSW-110-22-F-D-VS-K
J3A
10-pin SMT Plug
Samtec
TSM-105-01-L-DV-P
J3B
10 -pin SMT Socket
Samtec
SSW-105-22-F-D-VS-K
ADS7845EVM PWB (must be
RoHS compliant)
Texas Instruments
6478716
JMP2, JMP3
2 Position Jumper, 0.1" spacing
Samtec
TSW-102-07-L-S
JMP1, JMP4
2 X 3 Position Header, 0.1"
spacing
Samtec
TSW-103-07-L-D
L1, L2
100µH Surface Mount Inductor,
Shielded
API Delevan
S1210R-104K
TP1
Miniature Test Point Terminal
Keystone Electronics
5000
TP2, TP3
Multipurpose Test Point Terminal
Keystone Electronics
5011
N/A
Header Shorting Block
Samtec
SNT-100-BK-T
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EVM Bill of Materials and Schematic
Table 6. USB-MODEVM Bill of Materials
Designators
Description
Manufacturer
Mfg. Part Number
R4
10Ω 1/10W 5% Chip Resistor
Panasonic
ERJ-3GEYJ100V
R10, R11
27.4Ω 1/16W 1% Chip Resistor
Panasonic
ERJ-3EKF27R4V
R20
75Ω 1/4W 1% Chip Resistor
Panasonic
ERJ-14NF75R0U
R19
220Ω 1/10W 5% Chip Resistor
Panasonic
ERJ-3GEYJ221V
R14, R21, R22
390Ω 1/10W 5% Chip Resistor
Panasonic
ERJ-3GEYJ391V
R13
649Ω 1/16W 1% Chip Resistor
Panasonic
ERJ-3EKF6490V
R9
1.5kΩ 1/10W 5%
Chip Resistor
Panasonic
ERJ-3GEYJ152V
R1, R2, R3, R5, R6, R7, 2.7kΩ 1/10W 5%
R8
Chip Resistor
Panasonic
ERJ-3GEYJ272V
R12
3.09kΩ 1/16W 1%
Chip Resistor
Panasonic
ERJ-3EKF3091V
R15, R16
10kΩ 1/10W 5%
Chip Resistor
Panasonic
ERJ-3GEYJ103V
R17, R18
100kΩ 1/10W 5%
Chip Resistor
Panasonic
ERJ-3GEYJ104V
RA1
10kΩ 1/8W Octal Isolated
Resistor Array
CTS Corporation
742C163103JTR
C18, C19
33pF 50V Ceramic
Chip Capacitor, ±5%, NPO
TDK
C1608C0G1H330J
C13, C14
47pF 50V Ceramic
Chip Capacitor, ±5%, NPO
TDK
C1608C0G1H470J
C20
100pF 50V Ceramic
Chip Capacitor, ±5%, NPO
TDK
C1608C0G1H101J
C21
1000pF 50V Ceramic
Chip Capacitor, ±5%, NPO
TDK
C1608C0G1H102J
C15
0.1µF 16V Ceramic
Chip Capacitor, ±10%,X7R
TDK
C1608X7R1C104K
C16, C17
0.33µF 16V Ceramic
Chip Capacitor, +/-20%,Y5V
TDK
C1608X5R1C334K
C9, C10, C11, C12,
C22, C23, C24, C25,
C26, C27, C28
1µF 6.3V Ceramic Chip
Capacitor, ±10%, X5R
TDK
C1608X5R0J105K
C1, C2, C3, C4, C5, C6, 10µF 6.3V Ceramic
C7, C8
Chip Capacitor, ±10%, X5R
TDK
C3216X5R0J106K
D1
50V, 1A, Diode MELF SMD
Micro Commercial Components
DL4001
D2
Yellow Light Emitting Diode
Lumex
SML-LX0603YW-TR
D3, D4, D6, D7
Green Light Emitting Diode
Lumex
SML-LX0603GW-TR
D5
Red Light Emitting Diode
Lumex
SML-LX0603IW-TR
Q1, Q2
N-Channel MOSFET
Zetex
ZXMN6A07F
X1
6MHz Crystal SMD
Epson
MA-505 6.000M-C0
U8
USB Streaming Controller
Texas Instruments
TAS1020BPFB
U2
5V LDO Regulator
Texas Instruments
REG1117-5
U9
3.3V/1.8V Dual Output LDO
Regulator
Texas Instruments
TPS767D318PWP
U3, U4
Quad, Tri-State Buffers
Texas Instruments
SN74LVC125APW
U5, U6, U7
Single IC Buffer Driver with Open
Drain o/p
Texas Instruments
SN74LVC1G07DBVR
U10
Single Tri-State Buffer
Texas Instruments
SN74LVC1G125DBVR
Microchip
24LC64I/SN
Texas Instruments
6463995
U1
64K 2-Wire Serial EEPROM
USB-MODEVM PCB
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EVM Bill of Materials and Schematic
Table 6. USB-MODEVM Bill of Materials (continued)
7.1
Designators
Description
Manufacturer
Mfg. Part Number
TP1, TP2, TP3, TP4,
TP5, TP6, TP9, TP10,
TP11
Miniature test point terminal
Keystone Electronics
5000
TP7, TP8
Multipurpose test point
terminal
Keystone Electronics
5011
J7
USB Type B Slave Connector
Thru-Hole
Mill-Max
897-30-004-90-000000
J1, J2, J3, J4, J5, J8
2-position terminal block
On Shore Technology
ED555/2DS
J9
2.5mm power connector
CUI Stack
PJ-102B
J10
BNC connector, female,
PC mount
AMP/Tyco
414305-1
J11A, J12A, J21A, J22A 20-pin SMT plug
Samtec
TSM-110-01-L-DV-P
J11B, J12B, J21B, J22B 20-pin SMT socket
Samtec
SSW-110-22-F-D-VS-K
J13A, J23A
10-pin SMT plug
Samtec
TSM-105-01-L-DV-P
J13B, J23B
10-pin SMT socket
Samtec
SSW-105-22-F-D-VS-K
J6
4-pin double row header (2x2)
0.1"
Samtec
TSW-102-07-L-D
J14, J15
12-pin double row header (2x6)
0.1"
Samtec
TSW-106-07-L-D
JMP1-JMP4
2-position jumper,
0.1" spacing
Samtec
TSW-102-07-L-S
JMP8-JMP14
2-position jumper,
0.1" spacing
Samtec
TSW-102-07-L-S
JMP5, JMP6
3-position jumper,
0.1" spacing
Samtec
TSW-103-07-L-S
JMP7
3-position dual row jumper,
0.1" spacing
Samtec
TSW-103-07-L-D
SW1
SMT, half-pitch 2-position switch
C&K Division, ITT
TDA02H0SK1
SW2
SMT, half-pitch 8-position switch
C&K Division, ITT
TDA08H0SK1
Jumper plug
Samtec
SNT-100-BK-T
ADS7845EVM Schematic
The schematic diagram is provided as a reference.
7.2
USB-MODEVM Schematic
The schematic diagram is provided as a reference.
12
ADS7845EVM and ADS7845EVM-PDK
SBAU122 – March 2006
Submit Documentation Feedback
1
2
3
4
5
6
REVISION HISTORY
REV
ENGINEERING CHANGE NUMBER
APPROVED
D
D
J2A (TOP) = SAM_TSM-110-01-L-DV-P
J2B (BOTTOM) = SAM_SSW-110-22-F-D-VS-K
J1
0 ohm
J2
C11 +VCC
1uF
1
10
U1
2
3
4
5
0 ohm
R5
0 ohm
7
8
R6
100 ohm
9
C1
NI
C2
NI
C3
NI
C4
NI
C5
NI
C6
NI
16
15
14
13
12
11
DCLK
CS
DIN
BUSY
DOUT
PENIRQ
WIPER
AUXIN
VREF
SCLK
SS
MOSI
MISO
PENIRQ
R12
8
R9
2.7K
C10
1uF
6
4
VCC
JMP2
VSS
1
2
24LC64I/SN
TP3
1
2
3
2
4
6
JPR-2X1
2
VREF INPUT
C9
10uF
JMP3
U3
IN
OUT
GND
C8
0.47uF
2
1
1
3
B
U2
+VCC
JMP1
1
3
EXT VREF 5
+VCC
C
+VCC
ADS7845E
+VCC
R11
2.7K
DAUGHTER-SERIAL
10K
GND
J1A (TOP) = SAM_TSM-110-01-L-DV-P
J1B (BOTTOM) = SAM_SSW-110-22-F-D-VS-K
UL
UR
LL
LR
R10
2.7K
7
C
33
6
R4
HEADER-10X2
R8
+VCC
SCL
0 ohm
33
2
4
6
8
10
12
14
16
18
20
GPIO0
DGND
GPIO1
GPIO2
DGND
GPIO3
GPIO4
SCL
DGND
SDA
WP
R3
REFREF+
R7
CNTL
CLKX
CLKR
FSX
FSR
DX
DR
INT
TOUT
GPIO5
5
0 ohm
1
3
5
7
9
11
13
15
17
19
SDA
R2
A0
A1
A2
UL
LL
UR
LR
WIPER
AUXIN
2
4
6
8
10
12
14
16
18
20
+VCC
+VCC
1
3
5
7
9
11
13
15
17
19
R1
REF3125AIDBZ
B
J3A (TOP) = SAM_TSM-105-01-L-DV-P
J3B (BOTTOM) = SAM_SSW-105-22-F-D-VS-K
TP1
J3
+VCC
C7
10uF
6
4
2
JMP4
5
3
1
+5VA
DGND
ANALOG POWER
1
3
5
7
9
+VA
+5VA
DGND
+1.8VD
+3.3VD
-VA
-5VA
AGND
VD1
+5VD
2
4
6
8
10
AGND
TP2
DAUGHTER-POWER
+3.3Vd
L1
100uH
+VD1
L2
100uH
ti
A
DATA ACQUISITION PRODUCTS
HIGH-PERFORMANCE ANALOG DIVISION
SEMICONDUCTOR GROUP
6730 SOUTH TUCSON BLVD., TUCSON, AZ 85706 USA
TITLE
ENGINEER
RICK DOWNS
DRAWN BY
ROBERT BENJAMIN
ADS7845 Evaluation Module
DOCUMENT CONTROL NO. 6478717
SHEET
1
2
3
4
5
1
OF
1
FILE
SIZE B
REV A
DATE 7-Mar-2006
C:\WORK\ADS7845EVM\SCH\ADS7845EVM
6
A
1
2
3
4
6
5
REVISION HISTORY
REV
IOVDD
R5
2.7K
2
5
9
12
1
USB MCK
4
10
USB I2S
13
J6
Q2
ZXMN6A07F
EXTERNAL I2C
SDA
SCL
WP
8
A0
A1
A2
U1
VCC
C9
1uF
4
1
1
3
5
7
9
11
3
2
44
43
42
41
40
39
37
38
36
35
34
32
R12
3.09K
.001uF
R10
27.4
R11
C13
47pF
C14
47pF
R7
2.7K
JMP8
1
2
P1.2
P1.1
P1.0
+3.3VD
C11
1uF
C12
1uF
C
MOSI
SS
SCLK
RESET
14
VCC
J15
1
3
5
7
9
11
3
6
8
11
1Y
2Y
3Y
4Y
7
GND
2
4
6
8
10
12
EXTERNAL SPI
USB RST
USB SPI
P3.5
JMP13
1
2
D2
+3.3VD
YELLOW
C25
R8
2.7K
P3.4
JMP14
1
2
IOVDD
P3.3
B
U6
1uF
4
2
INT
3
J8
5
B
1A
2A
3A
4A
1OE
2OE
3OE
4OE
JMP12
1
2
SML-LX0603YW-TR
MISO
SN74LVC1G07DBV
SN74LVC125APW
MRESET
649
2
U4
2
5
9
12
1
4
10
13
USB ACTIVE
R13
4
1uF
JMP11
1
2
C10
1uF
EXTERNAL AUDIO DATA
C27 IOVDD
JMP10
1
2
C24
1uF
SW DIP-8
P1.3
JMP9
1
2
SN74LVC1G07DBV
ED555/2DS
+5VD
EXT PWR IN
+1.8VD
R14
390
U9
5
6
4
1
2
3
6VDC-10VDC IN
D3
SML-LX0603GW-TR
JMP6
PWR SELECT
GREEN
3
9
U2
REG1117-5
3
C15 DL4001
0.1uF
VIN
C16
0.33uF
VOUT
GND
D1
10
11
12
2
R15
10K
C6
10uF
1
J9
R16
10K
+5VD
A
+3.3VD
+1.8VD
IOVDD
JMP7
1
2
3
4
5
6
TP6
1IN
1IN
1EN
1GND
2GND
2EN
2IN
2IN
1RESET
1OUT
1OUT
2RESET
2OUT
2OUT
TPS767D318PWP
CUI-STACK PJ102-B
2.5 MM
SW1
1
2
4
3
24
23
22
18
17
R17
100K
C7
10uF
D5
SML-LX0603IW-TR
R18
100K
R4
10
+3.3VD
RED
R19
220
!"
C8
10uF
D4
SML-LX0603GW-TR
C17
0.33uF
1.8VD ENABLE
3.3VD ENABLE
28
GREEN
DATA ACQUISITION PRODUCTS
REGULATOR ENABLE
6730 SOUTH TUCSON BLVD., TUCSON, AZ 85706 USA
TITLE
ENGINEER RICK DOWNS
USB-MODEVM INTERFACE
DRAWN BY ROBERT BENJAMIN
DOCUMENT CONTROL NO. 6463996
SHEET 1
2
A
HIGH PERFORMANCE ANALOG DIVISION
SEMICONDUCTOR GROUP
IOVDD SELECT
1
SW2
1
2
3
4
5
6
7
8
PWR_DWN
U7
31
30
29
27
26
25
24
23
8
21
33
2
16
15
14
13
12
11
10
9
2
4
6
8
10
12
1uF
TP11
+3.3VD
IOVDD
C26
3
P1.7
P1.6
P1.5
P1.4
P1.3
P1.2
P1.1
P1.0
DVDD
DVDD
DVDD
AVDD
9
10
11
12
13
14
15
17
18
19
20
22
27.4
XTALO
XTALI
PLLFILI
PLLFILO
MCLKI
PUR
DP
DM
DVSS
DVSS
DVSS
AVSS
MRESET
TEST
EXTEN
RSTO
P3.0
P3.1
P3.2/XINT
P3.3
P3.4
P3.5
NC
NC
7
1
2
3
1.5K
+3.3VD
U8
TAS1020BPFB
SCL
SDA
VREN
RESET
MCLKO2
MCLKO1
CSCLK
CDATO
CDATI
CSYNC
CRESET
CSCHNE
46
47
48
1
3
5
6
7
4
16
28
45
100pF
C21
R9
J14
1uF
33pF
MA-505 6.000M-C0
6.00 MHZ
J7 USB SLAVE CONN
897-30-004-90-000000
I2SDOUT
C23
U5
C19
C20
4
3
2
1
BCLK
SN74LVC1G07DBV
33pF
24LC64I/SN
GND
D+
DVCC
X1
C18
A0
A1
A2
USB I2S
USB MCK
USB SPI
USB RST
EXT MCK
LRCLK
IOVDD
4
VSS
R20
75
MCLK
7
GND
R6
2.7K
RA1
10K
I2SDIN
6
5
+3.3VD
SCL
C
SN74LVC1G125DBV
3
6
8
11
1Y
2Y
3Y
4Y
D
2
SN74LVC125APW
+3.3VD
TP10
14
VCC
+3.3VD
5
1
3
1A
2A
3A
4A
1OE
2OE
3OE
4OE
5
2
4
4
1uF
U3
APPROVED
J10
EXT MCLK
U10
3
R3
2.7K
TP9
SDA
1uF
5
C22
Q1
ZXMN6A07F
D
C28 IOVDD
IOVDD
+3.3VD
ENGINEERING CHANGE NUMBER
3
4
5
OF
2
FILE
SIZE B
REV B
DATE 28-Oct-2004
D:\USB-MODEVM\USB Motherboard - ModEvm.ddb - Documents\USB Interface
6
1
2
3
4
5
6
REVISION HISTORY
REV
ENGINEERING CHANGE NUMBER
APPROVED
D
1
2
3
D
J11
J12
A0(+)
A1(+)
A2(+)
A3(+)
A4
A5
A6
A7
REFREF+
2
4
6
8
10
12
14
16
18
20
+5VA
J13A (TOP) = SAM_TSM-105-01-L-DV-P
J13B (BOTTOM) = SAM_SSW-105-22-F-D-VS-K
DAUGHTER-ANALOG
J11A (TOP) = SAM_TSM-110-01-L-DV-P
J11B (BOTTOM) = SAM_SSW-110-22-F-D-VS-K
+5VA
+5VD
JMP1
1
2
+VA
+5VA
DGND
+1.8VD
+3.3VD
-VA
-5VA
AGND
VD1
+5VD
2
4
6
8
10
GPIO0
DGND
GPIO1
GPIO2
DGND
GPIO3
GPIO4
SCL
DGND
SDA
SCLK
SS
P3.3
J12A (TOP) = SAM_TSM-110-01-L-DV-P
J12B (BOTTOM) = SAM_SSW-110-22-F-D-VS-K
+5VA
TP2
10uF
C2
+5VD
TP3
10uF
C3
TP4
10uF
JMP3
PWR_DWN
INT
JMP4
MISO
+3.3VD
MOSI
R1
R21
390
J1
-5VA
R22
390
SCL
2.7K
J2
+5VA
D6
SML-LX0603GW-TR
D7
SML-LX0603GW-TR
GREEN
GREEN
J3
+5VD
TP5
+1.8VD
C
RESET
IOVDD
2
C1
P3.5
P1.0
1
-5VA
P3.4
+5VD
JMP2
1
2
TP1
JMP5
2
4
6
8
10
12
14
16
18
20
-5VA
DAUGHTER-POWER
TP7
TP8
AGND
DGND
JPR-2X1
C
CNTL
CLKX
CLKR
FSX
FSR
DX
DR
INT
TOUT
GPIO5
DAUGHTER-SERIAL
J13
1
3
5
7
9
1
3
5
7
9
11
13
15
17
19
2
A0(-)
A1(-)
A2(-)
A3(-)
AGND
AGND
AGND
VCOM
AGND
AGND
1
1
3
5
7
9
11
13
15
17
19
C4
C5
10uF
10uF
J4
+1.8VD
R2
SDA
2.7K
I2SDOUT
J5
+3.3VD
I2SDIN
LRCLK
BCLK
J21
1
3
5
7
9
11
13
15
17
19
B
A0(-)
A1(-)
A2(-)
A3(-)
AGND
AGND
AGND
VCOM
AGND
AGND
J22
A0(+)
A1(+)
A2(+)
A3(+)
A4
A5
A6
A7
REFREF+
2
4
6
8
10
12
14
16
18
20
1
3
5
7
9
11
13
15
17
19
+5VA
DAUGHTER-ANALOG
J21A (TOP) = SAM_TSM-110-01-L-DV-P
J21B (BOTTOM) = SAM_SSW-110-22-F-D-VS-K
+1.8VD
+VA
+5VA
DGND
+1.8VD
+3.3VD
GPIO0
DGND
GPIO1
GPIO2
DGND
GPIO3
GPIO4
SCL
DGND
SDA
2
4
6
8
10
12
14
16
18
20
P1.1
B
P1.2
P1.3
MCLK
DAUGHTER-SERIAL
J23
1
3
5
7
9
CNTL
CLKX
CLKR
FSX
FSR
DX
DR
INT
TOUT
GPIO5
-VA
-5VA
AGND
VD1
+5VD
2
4
6
8
10
-5VA
J22A (TOP) = SAM_TSM-110-01-L-DV-P
J22B (BOTTOM) = SAM_SSW-110-22-F-D-VS-K
DAUGHTER-POWER
+3.3VD
+5VD
J23A (TOP) = SAM_TSM-105-01-L-DV-P
J23B (BOTTOM) = SAM_SSW-105-22-F-D-VS-K
!"
A
DATA ACQUISITION PRODUCTS
A
HIGH-PERFORMANCE ANALOG DIVISION
SEMICONDUCTOR GROUP
6730 SOUTH TUCSON BLVD., TUCSON, AZ 85706 USA
TITLE
ENGINEER
RICK DOWNS
DRAWN BY
ROBERT BENJAMIN
USB-MODEVM INTERFACE
DOCUMENT CONTROL NO. 6463996
SHEET 2
1
2
3
4
5
OF
2
FILE
SIZE B
REV B
DATE 28-Oct-2004
D:\USB-MODEVM\USB Motherboard - ModEvm.ddb - Documents\Daughtercard Interface
6
EVALUATION BOARD/KIT IMPORTANT NOTICE
Texas Instruments (TI) provides the enclosed product(s) under the following conditions:
This evaluation board/kit is intended for use for ENGINEERING DEVELOPMENT, DEMONSTRATION, OR EVALUATION
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product(s) must have electronics training and observe good engineering practice standards. As such, the goods being provided are
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This evaluation board/kit is intended for use for ENGINEERING DEVELOPMENT, DEMONSTRATION, OR EVALUATION
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can radiate radio frequency energy and has not been tested for compliance with the limits of computing devices pursuant to part 15
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It is important to operate this EVM within the input voltage range of 3.3V to 5V and the output voltage range of 0V to 5V.
Exceeding the specified input range may cause unexpected operation and/or irreversible damage to the EVM. If there are
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these devices during operation, please be aware that these devices may be very warm to the touch.
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www.ti.com/automotive
DSP
dsp.ti.com
Broadband
www.ti.com/broadband
Interface
interface.ti.com
Digital Control
www.ti.com/digitalcontrol
Logic
logic.ti.com
Military
www.ti.com/military
Power Mgmt
power.ti.com
Optical Networking
www.ti.com/opticalnetwork
Microcontrollers
microcontroller.ti.com
Security
www.ti.com/security
RFID
www.ti-rfid.com
Telephony
www.ti.com/telephony
Low Power
Wireless
www.ti.com/lpw
Video & Imaging
www.ti.com/video
Wireless
www.ti.com/wireless
Mailing Address: Texas Instruments, Post Office Box 655303, Dallas, Texas 75265
Copyright © 2007, Texas Instruments Incorporated
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