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User's Guide
SBOU056 – March 2008
USB DAQ Platform
This user's guide describes the characteristics, operation, and use of the USB DAQ Platform. It provides a
detailed description of the hardware design. The USB DAQ Platform is used as part of several of Texas
Instruments evaluation module kits; this document supplements the documentation of those evaluation
module kits.
Contents
1 Overview ...................................................................................................................... 2
2 System Setup ................................................................................................................ 4
3 Theory of Operation ......................................................................................................... 5
4 Detailed Description of Jumper Settings ................................................................................ 19
5 Bill of Materials ............................................................................................................. 25
List of Figures
1 Typical Hardware Included with the USB DAQ Platform ............................................................... 2
2 Hardware Setup for the USB DAQ Platform ............................................................................. 4
3 USB DAQ Platform Block Diagram ........................................................................................ 5
4 Digital I/O Area—Microcontroller .......................................................................................... 6
5 Digital I/O Area—I
2
C and SPI .............................................................................................. 7
6 Digital I/O Area—Internal Control Signals ................................................................................ 8
7 Digital I/O Area—CTRL and MEAS ....................................................................................... 8
8 Digital I/O Area—Address Select .......................................................................................... 9
9 Microcontroller Power ....................................................................................................... 9
10 USB I/O ...................................................................................................................... 10
11 Firmware EEPROM ........................................................................................................ 10
12 Power Indicators ............................................................................................................ 10
13 Reset ......................................................................................................................... 11
14 One-Wire Speed-Up Circuit ............................................................................................... 11
15 DUT Power Switching ..................................................................................................... 12
16 Loop and INA Supplies .................................................................................................... 13
17 I
2
C Isolation ................................................................................................................. 14
18 Calibration EEPROM ...................................................................................................... 14
19 TUSB UART to RS232 .................................................................................................... 14
20 DAC, ADC, and INA—Reference ........................................................................................ 15
21 DAC, ADC, and INA—ADS1100 a1 Connections ...................................................................... 15
22 DAC, ADC, and INA—ADS1100 a2 Connections ...................................................................... 16
23 DAC, ADC, and INA—DAC8574 ......................................................................................... 16
24 5V Default Jumper Settings ............................................................................................... 17
25 3V Default Jumper Settings ............................................................................................... 18
26 Connector Definition ...................................................................................................... 22
Windows is a registered trademark of Microsoft Corporation.
SPI is a trademark of Motorola, Inc.
I
2
C is a trademark of NXP Semiconductors.
All other trademarks are the property of their respective owners.
SBOU056 – March 2008 USB DAQ Platform 1
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