Texas Instruments ADS61B23EVM User Manual
3.2
Setting Up the EVM for ADC SPI Control
3.3
Using the TI ADC SPI Interface Software
3.3.1
SPI Register Writes
3.3.2
SPI Register Write Using a Script File
3.3.2.1
ADS61xx Frequently Used Registers
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TI ADC SPI Control Interface
Users who wish to use the ADC SPI interface must supply 5 VDC to J20, which provides power to the
USB circuit. By default, the EVM comes with the ADC configured in parallel mode. In order to use the SPI
interface to control the ADC modes of operation, users must move several jumpers.
USB circuit. By default, the EVM comes with the ADC configured in parallel mode. In order to use the SPI
interface to control the ADC modes of operation, users must move several jumpers.
•
Move jumper J3 to short positions 1–2, which places the ADC into serial operation mode.
•
Move jumper J7 to short positions 1–2, which allows the USB circuit to control SCLK.
•
Move jumper J6 to short positions 1–2, which allows the USB circuit to control SDATA.
•
Move jumper J2 to short positions 1–2, which allows the USB circuit to control SEN.
Once the software is installed and the USB cable is connected, three primary modes of operating the
software are available: SPI Register Writes, SPI Register Write Using a Script File, and
ADS61xx/ADS61B23 Frequently Used Registers.
software are available: SPI Register Writes, SPI Register Write Using a Script File, and
ADS61xx/ADS61B23 Frequently Used Registers.
The most basic mode of operation allows full control of writing to individual register addresses. In the top
left corner of the interface screen (
left corner of the interface screen (
), select the ADS61xx ADC from the ADC SPI Protocol
drop-down list. Next, type the Address Bytes(s) in hexadecimal (hex) and Data Byte(s) in hex, which can
be found in the device data sheet. When you are ready to send this command to the ADC, press "Enter"
on your keyboard. The graph indicator is updated with the patterns sent to the ADC. The default inputs to
both the Address Byte(s) and Data Byte(s) fields are hex inputs as designated by the small x in the
control. Users can change the default input style by clicking on the "x" to binary, decimal, octal, or hex.
Multiple register writes can be written simply by changing the contents of the Address Byte(s) and Data
Byte(s) field and pressing Enter again.
be found in the device data sheet. When you are ready to send this command to the ADC, press "Enter"
on your keyboard. The graph indicator is updated with the patterns sent to the ADC. The default inputs to
both the Address Byte(s) and Data Byte(s) fields are hex inputs as designated by the small x in the
control. Users can change the default input style by clicking on the "x" to binary, decimal, octal, or hex.
Multiple register writes can be written simply by changing the contents of the Address Byte(s) and Data
Byte(s) field and pressing Enter again.
For situations where the same multiple registers must be written on a frequent basis, users can easily use
a text editor to create a script file containing all ADC register writes. An example script file is located in the
\\Install Directory\Script Files\ADS6145_LVDS_CourseGain.txt. Users who wish to take advantage of
writing their own script files should start by using the ADS6145_LVDS_CourseGain.txt as a template file.
When ready to write the contents of the script file to the ADC, users can press the Load Script button and
they will be prompted for the file location of their script file. The commands are sent to the ADC when the
user acknowledges the selection of the file.
a text editor to create a script file containing all ADC register writes. An example script file is located in the
\\Install Directory\Script Files\ADS6145_LVDS_CourseGain.txt. Users who wish to take advantage of
writing their own script files should start by using the ADS6145_LVDS_CourseGain.txt as a template file.
When ready to write the contents of the script file to the ADC, users can press the Load Script button and
they will be prompted for the file location of their script file. The commands are sent to the ADC when the
user acknowledges the selection of the file.
For ease of use, several buttons have been added that allow one-click register writes of commonly used
features found in
features found in
. These are found in the ADS61xx tab, as these commands are specific to the
ADS61xx ADC only. The software writes to the ADC both the contents of the associated address and data
when the button is clicked. When the ADS61xx Reset button is pressed, it issues a software reset to the
ADC, and it resets the button values to match the contents inside of the ADC. The graph indicator plots
the SPI commands written to the ADC when a button has been depressed.
when the button is clicked. When the ADS61xx Reset button is pressed, it issues a software reset to the
ADC, and it resets the button values to match the contents inside of the ADC. The graph indicator plots
the SPI commands written to the ADC when a button has been depressed.
SLAU206B – September 2007 – Revised April 2008
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