SM-USB-DIG Platform

User's Guide
SBOU098 – January 2011
SM-USB-DIG Platform
This user's guide describes the characteristics, operation, and use of the SM-USB-DIG Platform. It
provides a detailed description of the hardware design. The SM-USB-DIG Platform is used as part of
several of Texas Instruments evaluation module kits; this document supplements the documentation of
those evaluation module kits.
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2
3
4
Contents
Overview ..................................................................................................................... 2
System Setup ................................................................................................................ 3
Theory of Operation ........................................................................................................ 4
Bill of Materials ............................................................................................................. 11
List of Figures
1
2
3
4
5
6
7
8
9
10
11
12
13
..........................................................
Hardware Setup for the SM-USB-DIG Platform.........................................................................
SM-USB-DIG Platform Block Diagram ...................................................................................
Digital I/O Area—Microcontroller ..........................................................................................
Digital I/O Area—I2C and SPI .............................................................................................
Digital I/O Area—CTRL and MEAS.......................................................................................
Digital I/O Area—Power Regulator .......................................................................................
USB I/O.......................................................................................................................
Firmware EEPROM .........................................................................................................
Power Indicators ............................................................................................................
Reset .........................................................................................................................
DUT Power Switching ......................................................................................................
Main EVM/Cable Connector (H2) .......................................................................................
Typical Hardware Included with the SM-USB-DIG Platform
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3
4
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8
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9
9
10
Microsoft, Windows are registered trademarks of Microsoft Corporation.
SPI is a trademark of Motorola, Inc.
I2C is a trademark of NXP Semiconductors.
All other trademarks are the property of their respective owners.
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1
Overview
1
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Overview
The SM-USB-DIG Platform is a data acquisition system that generates digital and power signals.
Specifically, the system generates I2C™, SPI™, and general-purpose digital I/O signals. The system also
generates a power-supply connection that has three options: +3.3V, +5V, and Hi-Z (0V).
In general, the SM-USB-DIG Platform is connected to an evaluation module test board; these two
components, along with the related cables and power supplies, form a complete evaluation module (EVM).
This EVM facilitates the evaluation of a specific device. For example, the TMP006EVM is a printed circuit
board (PCB) that connects to the SM-USB-DIG Platform that allows customers to evaluate and
understand all the features on the TMP006 integrated circuit device.
1.1
Hardware Included with a Typical SM-USB-DIG Platform
Figure 1 illustrates the typical hardware included the SM-USB-DIG Platform.
Figure 1. Typical Hardware Included with the SM-USB-DIG Platform
2
SM-USB-DIG Platform
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System Setup
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1.2
If You Need Assistance
If you have questions about the INA209 evaluation module, contact the Linear Amplifiers Applications
Team at [email protected]. Include SM-USB-DIG Platform as the subject heading.
1.3
FCC Warning
This equipment is intended for use in a laboratory test environment only. It generates, uses, and can
radiate radio frequency energy and has not been tested for compliance with the limits of computing
devices pursuant to subpart J of part 15 of FCC rules, which are designed to provide reasonable
protection against radio frequency interference. Operation of this equipment in other environments may
cause interference with radio communications, in which case the user at his own expense is required to
take whatever measures may be required to correct this interference.
2
System Setup
Figure 2 shows the typical system setup for the SM-USB-DIG Platform. The PC runs software that
communicates with the SM-USB-DIG Platform, while the SM-USB-DIG Platform generates the digital
signals used to communicate with the test board. Connectors on the test board are occasionally used to
connect external signals to the device under test (DUT). Jumpers and other circuitry on the test board
allow for different configurations of the DUT.
Figure 2. Hardware Setup for the SM-USB-DIG Platform
Minimum PC operating requirements:
• Microsoft® Windows® XP or higher
• Available USB port
NOTE: Works with either US or European regional settings.
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Theory of Operation
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Theory of Operation
The SM-USB-DIG Platform is a general-purpose data acquisition system that is part of several different
Texas Instruments EVMs. Figure 3 illustrates a block diagram of the platform.
The core of the SM-USB-DIG Platform is the TUSB3210, an 8052 microcontroller (mC) that has a built-in
USB interface. The microcontroller receives information from the host computer that it translates into I2C,
SPI, or other digital I/O patterns. During the digital I/O transaction, the microcontroller reads the response
of any device connected to the I/O interface. The response from the device is then sent back to the PC
where it is interpreted by the host computer.
+3.3V
VUSB
+5V
TUSB3210
8052 mC
with USB Interface
and UART
USB Bus
from
Computer
8Kx8-byte
EEPROM
Power-On Reset
+5.0V
USB Power
+3.0V
2
I C/SPI
Control and
Measure Bits
Buffers and
Level Translators
To Test Board
To Computer and Power Supplies
+3.3V
Regulator
SM USB DIG Platform
Power
Switching
VDUT
(H-Z, 3.3V, or 5V)
Switched
Power
Figure 3. SM-USB-DIG Platform Block Diagram
4
SM-USB-DIG Platform
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Theory of Operation
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3.1
Digital I/O Area
The following subsections discuss the digital I/O areas that surround the microcontroller. Refer to
SBOR012 (available for download from www.ti.com) for a detailed copy of the entire schematic.
3.1.1
Microcontroller
Figure 4 shows the detailed area surrounding the microcontroller. U2 is a TUSB3210 microcontroller—an
8052 core with a built-in USB interface. U2 converts information from the USB bus on the PC to I2C, SPI,
and One-Wire digital transactions. U2 runs on 3.3V; the inputs are not 5V tolerant. As a result, all external
input signals are level-translated.
Figure 4. Digital I/O Area—Microcontroller
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Theory of Operation
3.1.2
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I2C and SPI
Figure 5 shows the digital I/O area that manages I2C and SPI communications. U3 and U4 are open
collector drivers. These devices drive the I2C and SPI output signals. Note that the input is 3.3V and the
output follows VDUT (that is, 3V or 5V).
Figure 5. Digital I/O Area—I2C and SPI
3.1.3
CTRL and MEAS
Figure 6 shows the digital I/O area around the microcontroller. U5 and U9 are the bi-directional
level-translators for the general-purpose output/input signals, CTRL/MEAS4 and CTRL/MEAS5. The CTRL
signals are outputs, while the MEAS signals are inputs. The direction and function of the signals depends
on the DIR1 and DIR2 signals from the microcontroller that control U5 and U9, respectively.
Figure 6. Digital I/O Area—CTRL and MEAS
6
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Theory of Operation
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3.1.4
Power Regulator
Figure 7 shows the power regulator that supplies +3.3V to the microcontroller, digital circuitry, and VDUT
supply. U1 converts a +5V input to the +3.3V output. The +5V input is provided via the USB port.
Figure 7. Digital I/O Area—Power Regulator
3.2
USB I/O
Figure 8 shows the USB I/O area. H1 connects the USB bus to the TUSB3210 microcontroller. The
transistor and resistors are standard support circuitry for this device. See the TUSB3210 data sheet
(SLLS466F), available from www.ti.com, for more information.
Figure 8. USB I/O
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Theory of Operation
3.3
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Firmware EEPROM
Figure 9 shows the firmware EEPROM area. U6 is the 64K-byte EEPROM that contains the firmware
program used to run the microcontroller.
Figure 9. Firmware EEPROM
3.4
Power Indicators
Figure 10 shows the LED power indicators. The LEDs are used to indicate the power status of the unit.
The LED (D3) labeled 3.3V should be on when the system is powered up. VDUT is switched power, and
can be turned ON and OFF with software.
Figure 10. Power Indicators
8
SM-USB-DIG Platform
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3.5
Reset
Figure 11 shows the microcontroller reset circuitry. The reset circuit is connected to the RST pin on the
microcontroller and resets the microcontroller upon power-up. U10 is a Schmitt buffer that is used to
create a clean logic high or low (that is, the RST pin is connected to 3.3V or 0V, and not to intermediate
voltage levels).
Figure 11. Reset
3.6
DUT Power Switching
Figure 12 shows the DUT power switching. U8 is an auto-switching power mux from Texas Instruments. It
uses digital inputs as control lines to a Mux that can switch between two different voltages. On the
SM-USB-DIG, the Power MUX switches between the +5V USB supply and the +3.3V power regulator
output. Software can be used to set the VDUT output to +3.3V, +5V, or a Hi-Z state(disconnected).
Figure 12. DUT Power Switching
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Theory of Operation
3.7
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Main EVM/Cable Connector Definition on SM-USB-DIG Platform
There is one primary connector, H2, on the SM-USB-DIG that is used to connect the unit directly to an
EVM or to connect to a cable that connects to an EVM. Figure 13 shows the H2 connector.
Figure 13. Main EVM/Cable Connector (H2)
3.7.1
H2 Signal Definition
Table 1 lists the different signals connected to H2 on the SM-USB-DIG Platform and gives a description of
each signal.
Table 1. H2 Signal Definition (10-Pin, 50-mil Connector)
(1)
10
Pin on J1
Signal
1
I2C_SCL
2
CTRL/MEAS4
3
I2C_SDA1
4
CTRL/MEAS5
5
SPI_DOUT1
6
VDUT
7
SPI_CLK
Description
I2C clock signal (SCL)
GPIO: Control Output or Measure Input
I2C data signal (SDA)
GPIO: Control Output or Measure Input
SPI data output (MOSI)
Switchable DUT Power Supply: +3.3V, +5V, or Hi-Z
(disconnected). (1)
SPI clock signal (SCLK)
8
GND
9
SPI_CS1
Power return (GND)
SPI chip select signal (CS)
10
SPI_DIN1
SPI data input (MISO)
When VDUT is Hi-Z, all digital I/O are Hi-Z as well.
SM-USB-DIG Platform
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Bill of Materials
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4
Bill of Materials
Table 2 shows the parts list.
Table 2. Bill of Materials
Item
Qty
Ref Des
1
1
N/A
2
15
C1, C3, C5, C10,
C11, C12, C13,
C14, C15, C16,
C17, C18, C19,
C21, C24
3
2
4
Value
Description
Manufacturer
Part No
Printed circuit board
Texas Instruments
6522630
0.1mF
Capacitor, ceramic
0.1mF 16V X7R 0402
Murata
GRM155R71C104KA88D
C20, C23
1mF
Capacitor, ceramic
1.0mF 16V X5R 0402
TDK
C1005X5R1C105K
2
C2, C4
10mF
Capacitor, tantalum
10mF 10V 20% SMD
AVX
TAJP106M010RNJ
5
2
C6, C7
10000pF
Capacitor, ceramic
10000pF 500V X7R
0805
Johanson Dielectrics
501R15W103KV4E
6
2
C8, C9
33pF
Capacitor, ceramic
33PF 50V C0G 0402
Murata
GRM1555C1H330JZ01D
7
1
C22
10mF
Capacitor, tantalum
10mF 10V 20% SMD
Rohm
TCM1A106M8R
8
1
D1
TVS ESD ASD 181W
6.0V SOD-523
ON Semiconductor
ESD5Z6.0T1G
9
1
D2
Diode Schottky 40V
250MA SOD523
ON Semiconductor
NSR0340V2T1G
10
2
D3, D4
LED Green SS TYPE
LOW CUR SMD
Panasonic -SSG
LNJ308G8LRA
11
1
F1
Ferrite 300mA 600Ω
0603 SMD
Laird Signal Integrity
HZ0603C601R-10
12
1
Q1
Trans GP SS NPN 40V
ON Semiconductor
SOT323
MMBT2222AWT1G
13
2
R1, R11
33R
Resistor, 33Ω 1/16W
5% 0402 SMD
Rohm
MCR01MZPJ330
14
1
R2
15kΩ
Resistor, 15.0kΩ
1/16W 1% 0402 SMD
Rohm
MCR01MZPF1502
15
2
R3, R13
100kΩ
Resistor, 100kΩ 1/16W
Rohm
1% 0402 SMD
MCR01MZPF1003
16
1
R4
1.5kΩ
Resistor, 1.50kΩ
1/16W 1% 0402 SMD
Rohm
MCR01MZPF1501
17
2
R5, R6
10kΩ
Resistor, 10.0kΩ
1/16W 1% 0402 SMD
Rohm
MCR01MZPF1002
18
1
R7
47kΩ
Resistor, Array 47KΩ
8TERM 4RES SMD
Rohm
MNR14E0APJ473
19
4
R8, R9, R14, R15
47kΩ
Resistor, 47kΩ 1/16W
5% 0402 SMD
Rohm
MCR01MZPJ473
20
2
R10, R12
1MΩ
Resistor, 1.0MΩ 1/16W
Rohm
5% 0402 SMD
MCR01MZPJ105
21
2
R16, R20
49.9kΩ
Resistor, 49.9kΩ
1/10W 1% 0603 SMD
Rohm
MCR03EZPFX4992
22
2
R17, R18
1.2kΩ
Resistor, 1.20kΩ
1/16W 1% 0402 SMD
Rohm
MCR01MZPF1201
23
1
R19
698Ω
Resistor, 698Ω 1/10W
1% 0402 SMD
Panasonic - ECG
ERJ-2RKF6980X
24
1
R21
220kΩ
Resistor, 220kΩ 1/16W
Rohm
1% 0402 SMD
MCR01MZPF2203
25
2
R22, R23
510Ω
Resistor, 510Ω 1/16W
1% 0402 SMD
MCR01MZPF5100
Rohm
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Bill of Materials
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Table 2. Bill of Materials (continued)
Item
(1)
12
Qty
Ref Des
Value
1kΩ
Description
Manufacturer
Part No
Resistor, 1kΩ 1/8W 1%
Stackpole
0603 SMD
RNCP0603FTD1K00
26
1
R24
27
1
U1
IC 3.3V 150mA LDO
REG SOT-23-5
Texas Instruments
TPS76333DBVR
28
1
U2
IC USB Controller
storage 64-LQFP
Texas Instruments
TUSB3210PM
29
1
U3
IC Buff/Dvr Hex
NON-INV 14VQFN
Texas Instruments
SN74LVC07ARGYR
30
1
U4
IC Buff/Dvr DL
NON-INV SC706
Texas Instruments
SN74LVC2G07DCKR
31
2
U5, U9
IC Bus Transcvr
TRI-ST SOT6
Texas Instruments
SN74LVC1T45DRLR
32
1
U6
IC EEPROM 64KBit
400kHz SOT23-5
MicroChip
24LC64T-I/OT
33
1
U7
IC Positive-OR Gate
2-IN SC-70
Texas Instruments
SN74LVC1G32DCKR
34
1
U8
IC Autoswitching Pwr
Mux 8-SON
Texas Instruments
TPS2115ADRBR
35
1
U10
IC Buffer Schmitt Trig
SOT5
Texas Instruments
SN74LVC1G17DRLR
36
1
XTL1
Crystal 12.000 MHz
18PF SMD
TXC CORPORATION
7M-12.000MAAJ-T
37
1
H1
Conn Plug USB 4POS
RT ANG SMD
Molex
480371000
38
1
H2
Conn Header Rt Ang
10POS .050 (1)
Mill-Max
850-10-010-20-001000
Alternatively, cut down 850-10-050-20-001000 to 10-position size.
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