AMC131M01DFMR datasheet(37/81 Pages) TI

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result and does not provide another DRDY pulse until the second following instance when data are ready

because of how the pulse is generated. See the Collecting Data for the First Time or After a Pause in Data

Collection section for more information about the behavior of DRDY when data are not consistently read.

8.5.1.6 Conversion Synchronization or System Reset (SYNC/RESET)

The SYNC/RESET pin is a multifunction digital input pin that serves primarily to allow the host to synchronize

conversions to an external process or to reset the device. See the Synchronization section for more details

regarding the synchronization function. See the SYNC/RESET Pin section for more details regarding how the

device is reset.

8.5.1.7 SPI Communication Frames

SPI communication on the AMC131M01 is performed in frames. Each SPI communication frame consists of

several words. The word size is configurable as either 16, 24, or 32 bits by programming the WLENGTH[1:0] bits

in the MODE register.

The interface is full duplex, meaning that the interface is capable of transmitting data on DOUT while

simultaneously receiving data on DIN. The input frame that the host sends on DIN always begins with a

command. The first word on the output frame that the device transmits on DOUT always begins with the

response to the command that was sent in the previous input frame.

The number of words in a command depends on the command provided. For most commands, there are three

words in a frame. On DIN, the host provides the command, the command CRC if input CRC is enabled or a word

of zeros if input CRC is disabled, and one additional word of zeros. Simultaneously on DOUT, the device outputs

the response from the previous frame command, one word of ADC data representing the single ADC channel,

and a CRC word. If The ADC is disabled, this frame structure of three words still applies, and the data of the

disabled channel reads all zeros. Figure 8-19 shows a typical command frame structure.

DRDY

SCLK

DIN

DOUT

Channel 0 Data

CRC

Response

Hi-Z

Channel 0 Data

Response

Command

CRC

Command

CRC

Figure 8-19. Typical Communication Frame

There are some commands that require more than three words. In the case of a read register (RREG) command

where multiple registers are read, the response to the command contains the acknowledgment of the command

followed by the register contents requested, which can require a larger frame depending on how many registers

are read. See the RREG section for more details on the RREG command.

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AMC131M01

SBASA57 – SEPTEMBER 2023

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