Hardware Device Manager - Texas Instruments ADS5400EVM-CVAL User Manual

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4.1.2 Using the TI ADC SPI Interface
By default, the ADS5400EVM-CVAL is configured to allow the register space in the ADS5400HFS/EM to
be accessed by way of the TI ADC SPI User Interface. The TI ADC SPI User Interface has tabs across
the top of the User Interface window to choose the family of ADC EVM. At this time, the ADS5400HFS/EM
SPI format does not yet have a tab and is chosen instead by selecting the Register Interface tab and then
leaving the format selection on Select ADC. Later revisions of the TI ADC SPI User Interface may add a
device tab labeled as ADS5400HFS/EM.
The TI ADC SPI User Interface allows write access to the register space of the ADS5400HFS/EM. First,
the address of the register to be written is entered in the Address Byte field. Then the data value to be
written is entered in the Data Byte field. The write operation can then be completed by either pressing the
Send Data button or by hitting Enter on the keyboard. Both the address and data are by default entered in
hexadecimal notation, but the User Interface allows for the use of decimal, octal, or binary data formats as
well by using the mouse to change the data format from x to d, o, or b.
The address field of the register space in the ADS5400HFS/EM is 5 bits long. Three additional bits in the
SPI definition for the ADS5400HFS/EM are not currently supported by the SPI User Interface, and these
three additional bits (for read/write direction and for number of bytes to be written) must be set to 0 for use
with the SPI software. For example, a write to address 0b00101 binary is written to 0b00000101 in binary
or 0x05 in hexadecimal using the SPI User Interface. Later revisions to the SPI software may enable the
use of read-back from the SPI register space, but that is unsupported at this time.
SLAU471 – December 2012
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Figure 7. Hardware Device Manager
Copyright © 2012, Texas Instruments Incorporated
SPI Interface
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ADS5400EVM-CVAL