Texas Instruments PGA308, User Manual

Page: 13 / 35

2.4 Theory of Operation For the USB DAQ Platform
TUSB3210 8052 C
with USB Interface
and UART
m USB Bus
from Computer
3.3V
Regulator
Adjustable
Regulator
V
(2.7V to 5.5V)
CC
V C
m
S
3.3V
V_USB
5V
8k x 8 Byte
EEPROM
Buffers and
Latches
Power
Switching
V
(2.7V to 5.5V)
DUT
Switched Power
I C SPI
Control Bits
Measure Bits
2
External Power
(6V DC)
Reset Button and
Power-On-Reset
USB DAQ Platform
Reference
Circuits
4x 16-Bit String DAC
2x 16-Bit DS ADC
4-20mA
Loop Receiver
Loop Switching
Circuit
External Power
V = 40V DC
Loop Measurement
Circuitry = 15V
LOOP
±
4-20mA Reciever
2x 16-Bit ADC
DS
2x 16-Bit ADC
DS
Calibration
EEPROM
To Computer and
Power Supplies
To Test Board
www.ti.com
Theory of Operation For the USB DAQ Platform
Figure 2-3 shows the block diagram for the USB DAQ platform. This platform is a general-purpose data
acquisition system that is used on several different Texas Instruments evaluation modules. The block
diagram shown in
Figure 2-3 illustrates the general platform outline. The core component of the USB DAQ
platform is the TUSB3210.
Figure 2-3. Theory of Operation For the USB DAQ Platform
SBOU060 – July 2008 System Setup 13
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