Texas Instruments PGA309EVM-USB 用户手册
USB DAQ
Platform
PGA309
Test Board
EVM
Power
PGA309
V
Supply
Switched 5.0V Power
DUT
One-Wire Interface
25-Pin
Male DSUB Signals
From USB DAQ Platform
25-Pin
Female DSUB Signals
From USB DAQ Platform
I C
Interface
2
4mA to 20mA
I/V Converter
Sensor
Connection
Sensor
Emulator
www.ti.com
System Setup
2
System Setup
shows the system setup for the PGA309EVM. The PC runs software that communicates with the
USB-DAQ-Platform. The USB-DAQ-Platform generates the digital signals used to communicate with the
PGA309_Test_Board. Connectors on the PGA309_Test_Board allow for connection to the bridge sensor.
PGA309_Test_Board. Connectors on the PGA309_Test_Board allow for connection to the bridge sensor.
Figure 2. PGA309EVM-USB Hardware Setup
2.1
Theory of Operation for PGA309_Test_Board Hardware
shows the block diagram of the PGA309_Test_Board. The PGA309_Test_Board provides
connections to the I
2
C™, one-wire, analog-to-digital converters (ADCs) and digital-to-analog converters
(DACs) on the USB-DAQ-Platform. It also provides connection points for external connection of the bridge
sensor. The PGA309_Test_Board has circuitry to convert the PGA309 voltage output to 4mA to 20mA
current.
sensor. The PGA309_Test_Board has circuitry to convert the PGA309 voltage output to 4mA to 20mA
current.
Figure 3. PGA309_Test_Board Block Diagram
5
SBOU084 – February 2010
PGA309EVM-USB
Copyright © 2010, Texas Instruments Incorporated