AMC131M01DFMR datasheet(41/81 Pages) TI

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8.5.3 Commands

Table 8-9 contains a list of all valid commands, a short description of the functionality, the binary command word,

and the expected response that appears in the following frame.

Table 8-9. Command Definitions

COMMAND

DESCRIPTION

COMMAND WORD

RESPONSE

NULL

No operation

0000 0000 0000 0000

STATUS register

RESET

Reset the device

0000 0000 0001 0001

1111 1111 0010 0011

STANDBY

Place the device into standby mode

0000 0000 0010 0010

WAKEUP

Wake the device from standby mode to conversion mode

0000 0000 0011 0011

LOCK

Lock the interface such that only the NULL, UNLOCK, and

RREG commands are valid

0000 0101 0101 0101

UNLOCK

Unlock the interface after the interface is locked

0000 0110 0101 0101

RREG

Read nnn nnnn plus 1 registers beginning at address a aaaa a

101a aaaa annn nnnn

dddd dddd dddd dddd

111a aaa annn nnnn (1)

WREG

Write nnn nnnn plus 1 registers beginning at address a aaaa a

011a aaaa annn nnnn

010a aaaa ammm mmmm (2)

(1)

When nnn nnnn is 0, the response is the requested register data dddd dddd dddd dddd. When nnn nnnn is greater than 0, the

response begins with 111a aaaa annn nnnn, followed by the register data.

(2)

In this case, mmm mmmm represents the number of registers that are actually written minus one. This value can be less than nnn

nnnn in some cases.

8.5.3.1 NULL (0000 0000 0000 0000)

The NULL command is the no-operation command that results in no registers read or written, and the state of

the device remains unchanged. The intended use case for the NULL command is to read conversion data from

the ADC. The command response for the NULL command is the contents of the STATUS register. Any invalid

command also gives the NULL response.

8.5.3.2 RESET (0000 0000 0001 0001)

The RESET command resets the ADC to the register defaults. The command is latched by the device at the

end of the frame. A reset occurs immediately after the command is latched. The host must wait for tREGACQ after

reset before communicating with the device to make sure the registers have assumed the default settings. The

device sends an acknowledgment of FF23h when the ADC is properly reset. The device responds with 0011h if

the command word is sent but the frame is not completed, and therefore, the device is not reset. See the RESET

Command section for more information regarding the operation of the reset command. Figure 8-21 illustrates a

properly sent RESET command frame.

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AMC131M01

SBASA57 – SEPTEMBER 2023

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