SBAS978A June 2019 – May 2020 ADS7028
PRODUCTION DATA.
Refer to the PDF data sheet for device specific package drawings
The device features an enhanced-SPI interface that allows the host controller to operate at slower SCLK speeds and still achieve full throughput. As described in Table 6, the host controller can use any of the four SPI-compatible protocols (SPI-00, SPI-01, SPI-10, or SPI-11) to access the device.
PROTOCOL | SCLK POLARITY
(At the CS Falling Edge) |
SCLK PHASE
(Capture Edge) |
CPOL_CPHA[1:0] | DIAGRAM |
---|---|---|---|---|
SPI-00 | Low | Rising | 00b | Figure 30 |
SPI-01 | Low | Falling | 01b | Figure 31 |
SPI-10 | High | Falling | 10b | Figure 30 |
SPI-11 | High | Rising | 11b | Figure 31 |
On power-up or after coming out of any asynchronous reset, the device supports the SPI-00 protocol for data read and data write operations. To select a different SPI-compatible protocol, program the CPOL_CPHA[1:0] field. This first write operation must adhere to the SPI-00 protocol. Any subsequent data transfer frames must adhere to the newly-selected protocol.