Texas Instruments PGA112, Руководство пользователя

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2.1 Theory of Operation for PGA112_Test_Board Hardware
PGA112/
PGA113
V Supply
Switched 5.0V Power
DUT
·
·
·
General-Purpose Digital I/O
SPI Communication
MUX Logic Control
·
·
Analog DAC settings
for the inputs
Analog-to-digital
inputs for precision
measurements
Connection to
Optional External
Source
25-Pin
Male DSUB Signals
From USB DAQ Platform
25-Pin
Female DSUB Signals
From USB DAQ Platform
Optional
External SPI
Address
Jumpers
www.ti.com
System Setup
Figure 3 presents a block diagram of the PGA112_Test_Board. The functionality of this PCB is relatively
simple. It provides connections to the I
2
C™ and general-purpose input/outputs (GPIO) on the USB DAQ
Platform board. It also provides connection points for external connections of the shunt voltage, bus
voltage, and GND.
Figure 3. PGA112_Test_Board Block Diagram
See Figure 4 for an illustration of the PGA112_Test_Board schematic. The J1 connector ports the
analog-to-digital converters (ADCs), digital-to analog converters (DACs), and SPI™ control. The J2
connector ports the control bits for the input and output switches.
SBOU073 – February 2009 PGA112 Evaluation Module 5
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