Use Case
19
SLDU007C – March 2012 – Revised November 2015
Copyright © 2012–2015, Texas Instruments Incorporated
PGA450Q1EVM User’s Guide
11
Use Case
The purpose of this section is to provide step-by-step instructions on the setup and some basic evaluation
procedures.
11.1 Evaluation Through SPI Communication
In order to provide a quick evaluation of the IC performance using the TI EVM and GUI without having to
develop sophisticated 8051 µP software, the GUI provides an intuitive interface tab,
Evaluation Tab
, that
collects all necessary information regarding the transducer drive and receive. For transducer drive, it
includes: transducer frequency; transducer drive voltage, VREG; transformer configuration; and number of
drive pulses. For transducer signal receive, it includes signal-processing parameters: LNA gain setting;
BPF and LPF coefficient; clock selection; FIFO mode; and FIFO downsample size.
1. Make sure all jumpers are connected according to the default settings, see
.
2. Connect the hardware and power supply, see
. Make sure USB cable is connected to the
computer and the interface board. It is recommended to monitor power supply current. Normal idle
current is around 6 mA. Active current is around 15 mA.
3. Launch GUI software on computer.
4. Click the "OFF (Micro Reset)" button to put the Micro in reset, then click READ ALL to read the default
register values. Some default values are loaded in the table grid. If all are 0 or FF values, this means
that there is an error with communication to the device. Check the hardware setup or restart the GUI
software.
Fill out the "Evaluation" tab with the values shown in
.
Use the "Eval Monitor" tab to send bursts and view the resulting echo data.
Figure 15. Evaluation Tab Setting
After all information is entered, make sure the device is in the micro reset state, then hit the
Transducer
Drive and Receive
button to start the burst and receive.
