Datasheet

Change of clock

relationship of

digital interface

Control of offset correction

(enabled by disabling low

latency mode)

Enable different output data

as well as a custom pattern

TI ADC SPI Control Interface

www.ti.com

Figure 7. GUI Advanced Page

3.4 Controlling the SPI Interface Using TI TSW1200 Software 2.0

The ADS41xxEVM provides an option for the TSW1200 to drive the SPI interface to perform register

writes to the ADS41xx register space. To enable this option, the 0-Ω resistors installed in locations R7,

R19, and R20 must be removed and installed in locations R65, R66, and R67 instead. This connects the

SPI signals SCLK, SEN, and SDATA to the TSW1200 connector J4 instead of to the USB port on the

EVM.

The TSW1200 User Interface revision 2.0 or newer includes a SPI control pane as shown in Figure 8.

Much like the TI ADC SPI User Interface, the SPI pane of the TSW1200 User Interface allows register

accesses to be specified in terms of address byte and data byte. The Send Data button causes the

registers accesses listed in the SPI Command Queue to be written to the ADS41xx. Unlike the TI ADC

SPI Interface, the TSW1200 User Interface allows several register accesses to be entered into the

Command Queue, and then pressing the Send Data button causes the whole queue to be written at once.

The benefit of using the Command Queue to queue up register accesses is that once a commonly used

string of register accesses are listed in the command queue, the queue may be saved under a command

name, and loading this command name later fills the queue with the string of register accesses and then

the send data button writes the queue to the ADC. This simple mechanism of creating a script of register

writes may be more convenient for frequently used sequences of register writes. Also, if a register access

is typed incorrectly, then by writing to the queue before sending the data to the device allows the chance

to clear the queue and start typing again in the register accesses.

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

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