Datasheet

3.3.1 SPI Register Writes
3.3.2 SPI Register Write Using a Script File
3.3.2.1 ADS62PXX Frequently Used Registers
TI ADC SPI Control Interface www.ti.com
The most basic mode of operation allows full control of writing to individual register addresses. From the
tabs at the top of the interface screen (Figure 8 ), select the ADS62PXX ADC. 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, either press "Enter" on your keyboard or press the
Send Data button. 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" or Send Data again. The ADC SPI History window will keep track of the
register writes performed in a session.
After the ADC is configured to the desired usage, users can save time in future ADC configurations by
saving a script file. By pressing the Save Script button, it dumps ADC SPI History window contents into a
text file. Alternatively, users can edit the script file in a text editor. An example script file is located in the
\\Install Directory\Script Files\ADS62PXX_LVDS_oBinary.txt which configures the ADC for use with the
TSW1200. 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, however the graph indicator does not show multiple
writes. The ADC SPI History will update to show the register writes executed in the script file.
For ease of use, several buttons have been added that allow one-click register writes of commonly used
features found in Table 8 . These are found in the ADS62PXX tab (note that there is one tab for
ADS62PX5/X4/X3/X2,one tab for ADS62Px9/X8 and one tab for ADS62C15/17, because these
commands are specific to the ADS62PXX ADC only. The software writes to the ADC both the contents of
the associated address and data when the button is clicked. When the ADS62PXX 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
pressed.
Table 8. ADS62PXX Frequently Used Registers
Default Value Alternate Value
ADS62PXX Reset
Over-ride bit: Off Over-ride bit: On
2s Complement Straight Binary
CMOS DDR LVDS
Powerdown: OFF Multiple Powerdown Options
No Course Gain 3.5-dB Course Gain
INT Reference EXT Reference
Bit-Wise (LVDS Only) Byte-Wise
Test Mode: None Multiple Options
Fine Gain Multiple Options
20 ADS62PXXEVM SLAU237A – May 2008 – Revised April 2009
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