ADS8699IPWR datasheet(35/74 Pages) TI2

35 / 74 page

7.4 Device Functional Modes

The device features the multiSPI digital interface for communication and data transfer between the device and

the host controller. The multiSPI interface supports many data transfer protocols that the host uses to exchange

data and commands with the device. The host can transfer data into the device using one of the standard SPI

modes. However, the device can be configured to output data in a number of ways to suit the application

demands of throughput and latency. The data output in these modes can be controlled either by the host or the

device, and the timing can either be system synchronous or source synchronous. For detailed explanation of the

supported data transfer protocols, see the Data Transfer Protocols section.

This section describes the main components of the digital interface module as well as supported configurations

and protocols. As shown in Figure 7-19, the interface module is comprised of shift registers (both input and

output), configuration registers, and a protocol unit. During any particular data frame, data are transferred both

into and out of the device. As a result, the host always perceives the device as a 32-bit input-output shift register,

as shown in Figure 7-19.

Interface Module

Configuration Registers

RST

CONVST

SCLK

ALARM/SDO-1/GPO

RVS

Digital

Control

Logic

Output Register (Data and Flags from Device)

Input Register

D31

D30

B31

B30

ADC

Command Processor

SCLK

Counter

SDI

LSB

LSB+1

MSB-1

MSB

SDO-0

Unified Shift Register

Figure 7-19. Device Interface Module

The Pin Configuration and Functions section provides descriptions of the interface pins; the Data Transfer Frame

section details the functions of shift registers, the SCLK counter, and the command processor; the Data Transfer

Protocols section details supported protocols; and the Register Maps section explains the configuration registers

and bit settings.

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ADS8691, ADS8695, ADS8699

SBAS777B – DECEMBER 2016 – REVISED MARCH 2021

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