DS2890V 데이터 시트보기 (PDF) - Dallas Semiconductor -> Maxim Integrated

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DS2890V

1-Wire® Digital Potentiometer

Dallas Semiconductor -> Maxim Integrated 

DS2890

RESUME COMMAND [A5H]

In a typical application the DS2890 may be accessed several times to complete a control adjustment. In a

multi-drop environment this means that the 64-bit ROM sequence of a Match ROM command has to be

repeated for every access. To maximize the data throughput in a multi-drop environment the Resume

Command function was implemented. As shown in Figure 19, this function checks the status of the RC

flag and, if it is set, directly transfers control to the potentiometer functions, similar to a Skip ROM

command. The only way to set the RC flag is through successfully executing the Match ROM, Search

ROM, Conditional Search ROM, or Overdrive Match ROM command. Once the RC flag is set, the

device can repeatedly be accessed through the Resume Command function. Accessing another device on

the bus will clear the RC flag, preventing two or more devices from simultaneously responding to the

Resume Command function.

POTENTIOMETER FUNCTION EXAMPLE

At regular speed with an auxiliary supply (VDD within range): turn on the charge pump, set the wiper

position to mid-point, increment the wiper twice, and decrement the wiper once.

MASTER MODE

TX

RX

TX

TX

TX

RX

TX

RX

TX

RX

TX

TX

TX

RX

TX

RX

TX

RX

TX

DATA (LSB FIRST)

Reset

Presence

CCh

55h

4Ch

<data byte>

96h

<data bits>

Reset

Presence

CCh

0Fh

7Fh

<data byte>

96h

<data bits>

Reset

Presence

CCh

COMMENTS

Reset Pulse (480 - 960 µs)

Presence Pulse

Issue Skip ROM Command

Issue Write Control Register Command

Issue Control Register value for WN=0, CPC=1

Read back Control Register value (4Ch) and verify

Issue Release Code to update Control Register

If 0’s are read, update was successful; if 1’s are read,

the update failed

Reset Pulse (480 - 960 µs)

Presence Pulse

Issue Skip ROM Command

Issue Write Position Command

Write Wiper Position value

Read back Wiper Position byte and verify

Issue Release Code to update Wiper Position

If 0’s are read, update was successful; if 1’s are read,

the update failed

Reset Pulse

Presence Pulse

Issue Skip ROM Command

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