ADS7066 datasheet(21/48 Pages) TI

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Table 7-4. Output Data Frames

CRC_EN

OSR[2:0]

APPEND_STATUS[1:0]

OUTPUT DATA FRAME

DAISY-CHAIN

MODE

CRC module

disabled

(CRC_EN =

averaging

No flags (00b or 11b)

{Conversion result [15:0], 8'b0}

Supported

Channel ID (01b)

{Conversion result [15:0], CHID[3:0], 4'b0}

Supported

Status flags (10b)

{Conversion result [15:0], status flags[3:0], 4'b0}

Supported

Averaging

enabled

No flags (00b or 11b)

{Conversion result [19:0], 4'b0}

Supported

Channel ID (01b)

{Conversion result [19:0], CHID[3:0]}

Supported

Status flags (10b)

{Conversion result [19:0], status flags[3:0]}

Supported

CRC module

enabled

(CRC_EN =

averaging

No flags (00b or 11b)

{Conversion result [15:0], CRC[7:0], 8'b0}

Supported

Channel ID (01b)

{Conversion result [15:0], CHID[3:0], 4'b0, CRC[7:0]}

Not supported

Status flags (10b)

{Conversion result [15:0], status flags[3:0], 4'b0, CRC[7:0]}

Not supported

Averaging

enabled

No flags (00b or 11b)

{Conversion result [19:0], 4'b0, CRC[7:0]}

Not supported

Channel ID (01b)

{Conversion result [19:0], CHID[3:0], CRC[7:0]}

Not supported

Status flags (10b)

{Conversion result [19:0], status flags[3:0], CRC[7:0]}

Not supported

7.3.10 Device Programming

7.3.10.1 Enhanced-SPI Interface

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 7-5, 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.

Table 7-5. SPI Protocols for Configuring 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 7-5

SPI-01

Low

Falling

01b

Figure 7-6

SPI-10

High

Falling

10b

Figure 7-5

SPI-11

High

Rising

11b

Figure 7-6

On power-up, the device defaults to 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.

SCLK

SDO

MSB

MSB-1

MSB-2

LSB+1

LSB

CPOL = 0

CPOL = 1

Figure 7-5. Standard SPI Timing Protocol

(CPHA = 0)

SCLK

SDO

MSB

MSB-1

LSB+1

LSB

CPOL = 0

CPOL = 1

Figure 7-6. Standard SPI Timing Protocol

(CPHA = 1)

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ADS7066

SBAS928B – FEBRUARY 2020 – REVISED MAY 2023

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