Datasheet

TI ADC SPI Control Interface

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Figure 5. Found New Hardware

3.2 Setting Up the EVM for ADC SPI Control

Users who want to use the ADC SPI interface must configure three jumpers for proper control of the SPI

bus. 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 jumper JP12 to short positions 2–3, which places the ADC in serial operation mode.

• Move jumper JP11 to short positions 2–3, which allows the USB circuit to control SDATA.

• Move jumper JP9 to short positions 2–3, which allows the USB circuit to control SEN.

3.3 Using the TI ADC SPI Interface Software

Once the software is installed and the USB cable is connected, three primary modes of operating the

software are available: ADS41xx frequently used registers, SPI register writes, and SPI register writes

using a script file .

3.3.1 SPI Register Writes

By default the ADS41xx EVM is configured to allow access of the register space in the ADS41xx using the

TI ADC SPI user interface. The GUI contains a main and an advanced page but most of the programming

can be done on the main tab.

The main page (see Figure 6) provides bit switches for easy access of the most frequently used registers.

It also offers the option of directly writing data into registers through the address and data field. Additional

features like clock edge control or offset compensation are located on the advanced page of the GUI (see

Figure 7). Current registers being written are displayed on the right side in hexadecimal format as well as

in Boolean format on the bottom (16-bit total – 8-bit address and 8-bit data). The user also has the option

to load or save a register file.

After power up of the EVM, it is recommended to perform a reset of the USB port of the EVM (button on

top).

ADS41xx/58B18EVM SLWU067C–November 2009–Revised May 2012

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