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AD5231BRU50 データシート(PDF) 10 Page - Analog Devices

部品番号 AD5231BRU50
部品情報  Nonvolatile Memory, 1024-Position Digital Potentiometers
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メーカー  AD [Analog Devices]
ホームページ  http://www.analog.com
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AD5231BRU50 データシート(HTML) 10 Page - Analog Devices

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REV. 0
AD5231
–10–
OPERATIONAL OVERVIEW
The AD5231 digital potentiometer is designed to operate as a
true variable resistor replacement device for analog signals that
remain within the terminal voltage range of VSS < VTERM < VDD.
The basic voltage range is limited to a |VDD – VSS| < 5.5 V. The
digital potentiometer wiper position is determined by the RDAC
register contents. The RDAC register acts as a scratch pad regis-
ter allowing as many value changes as necessary to place the
potentiometer wiper in the correct position. The scratch pad
register can be programmed with any position value using the
standard SPI serial interface mode by loading the complete repre-
sentative data word. Once a desirable position is found this value
can be saved into an EEMEM register. Thereafter the wiper
position will always be set at that position for any future ON-
OFF-ON power supply sequence. The EEMEM save process
takes approximately 25 ms, during this time the shift register is
locked preventing any changes from taking place. The RDY pin
indicates the completion of this EEMEM save.
There are 16 instructions that facilitate users’ programming
needs. Refer to Table III. The instructions are:
1. Do Nothing
2. Restore EEMEM Setting to RDAC
3. Save RDAC Setting to EEMEM
4. Save RDAC Setting or User Data to EEMEM
5. Decrement 6 dB
6. Decrement 6 dB
7. Decrement One Step
8. Decrement One Step
9. Reset EEMEM setting to RDAC
10. Read EEMEM to SDO
11. Read Wiper Setting to SDO
12. Write Data to RDAC
13. Increment 6 dB
14. Increment 6 dB
15. Increment One Step
16. Increment One Step
Scratch Pad and EEMEM Programming
The scratch pad register (RDAC register) directly controls the
position of the digital potentiometer wiper. When the scratch
pad register is loaded with all zeros, the wiper will be connected
to the B-Terminal of the variable resistor. When the scratch pad
register is loaded with midscale code (1/2 of full-scale position),
the wiper will be connected to the middle of the variable resistor.
And when the scratch pad is loaded with full-scale code, all ones,
the wiper will connect to the A-Terminal. Since the scratch pad
register is a standard logic register, there is no restriction on the
number of changes allowed. The EEMEM registers have a program
erase/write cycle limitation described in the Flash/EEMEM
Reliability section.
Basic Operation
The basic mode of setting the variable resistor wiper position
(programming the scratch pad register) is accomplished by
loading the serial data input register with the command instruc-
tion #11, which includes the desired wiper position data. When
the desired wiper position is found, the user would load the
serial data input register with the command instruction #2,
which makes a copy of the desired wiper position data into the
nonvolatile EEMEM register. After 25 ms the wiper position
will be permanently stored in the nonvolatile EEMEM location.
Table I provides an application-programming example listing
the sequence of serial data input (SDI) words and the serial data
output appearing at the SDO Pin in hexadecimal format.
Table I. Set and Save RDAC Data to EEMEM Register
SDI
SDO
Action
B00100H
XXXXXXH
Loads data 100H into RDAC
register, Wiper W moves to 1/4
full-scale position.
20XXXXH B00100H
Saves copy of RDAC register
contents into EEMEM register.
At system power ON, the scratch pad register is automatically
refreshed with the value last saved in the EEMEM register. The
factory preset EEMEM value is midscale but thereafter, the
EEMEM value can be changed by user.
CS
CLK
SDI
IDD*
2mA/DIV
5V/DIV
5V/DIV
5V/DIV
* SUPPLY CURRENT RETURNS TO MINIMUM POWER CONSUMPTION
IF INSTRUCTION #0 (NOP) IS EXECUTED IMMEDIATELY AFTER
INSTRUCTION #1 (READ EEMEM)
4ms/DIV
TPC 19. IDD vs. Time (Read) Program Mode
CODE – Decimal
100
1
0.01
1024
0.1
10
RAB = 10k
RAB = 50k
RAB = 100k
896
768
640
512
384
128
256
0
VA = VB = OPEN
TA = 25 C
TPC 20. IWB_MAX vs. Code


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