Texas Instruments PGA309EVM-USB - Manual (Page 16)

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 mC
3.3V
S
V_USB
5V
8Kx8 Byte
EEPROM
Buffers and
Latches
Power
Switching
V
(2.7V to 5.5V)
DUT
Switched Power
I C, SPI
Control Bits, and
Measure Bits
2
External
Power
(6V )
DC
Reset Button
and
Power-On Reset
USB DAQ Platform
Calibration
EEPROM
Loop-Switching
Circuit
4mA to 20mA
Loop Receiver
External Power
V = 40V
Loop Measurement
Circuitry = 15V
LOOP DC
±
2x 16-Bit
Delta-Sigma ADC
2x 16-Bit
Delta-Sigma ADC 2x 16-Bit
Delta-Sigma ADC
Reference
Circuits
4x 16-Bit
String DAC
4mA to 20mA
Receiver
ToT
estBoard
ToPCandP
owerSupplies
PGA309EVM-USB Hardware Setup www.ti.com
2.5 Theory of Operation for USB-DAQ-Platform
Figure 9 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 details of
its operation are included in a separate document (available for download at
www.ti.com ). The block
diagram shown in Figure 9 gives a brief overview of the platform. The primary control device on the
USB-DAQ-Platform is the TUSB3210 .
Figure 9. Theory of Operation For USB-DAQ-Platform
3 PGA309EVM-USB Hardware Setup
The PGA309EVM-USB Hardware setup involves connecting the two halves of the EVM together, applying
power, connecting the USB cable, and setting the jumpers. This section covers the details of this
procedure.
3.1 Electrostatic Discharge Warning
Many of the components on the PBA309EVM-USB are susceptible to damage by electrostatic discharge
(ESD). Customers are advised to observe proper ESD handling precautions when unpacking and handling
the EVM, including the use of a grounded wrist strap at an approved ESD workstation.
CAUTION
Failure to observe ESD handling procedures may result in damage to EVM
components.
16 PGA309EVM-USB SBOU084 – February 2010
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