參數(shù)資料
型號(hào)： AD5232BRU10
廠商： ANALOG DEVICES INC
元件分類(lèi)： 數(shù)字電位計(jì)
英文描述： 8-Bit Dual Nonvolatile Memory Digital Potentiometer
中文描述： DUAL 10K DIGITAL POTENTIOMETER, 3-WIRE SERIAL CONTROL INTERFACE, 256 POSITIONS, PDSO16
封裝： MO-153AB, TSSOP-16
文件頁(yè)數(shù)： 10/20頁(yè)
文件大?。?/td> 268K
代理商： AD5232BRU10
REV. 0
–10–
AD5232
Also the left shift
commands were modified so that if the data in
the RDAC register is greater than or equal to midscale and the
data is left shifted then the data in the RDAC register is set to
full-scale. T his makes the left shift function as close to ideally
logarithmic as is possible.
T he right shift #4 and #5 commands
will be ideal only if the
LSB is zero (i.e., ideal logarithmic–no error). If the LSB is a
one then the right shift function generates a linear half L SB
error, which translates to a code dependent logarithmic error
for odd codes only as shown in the attached plots, (see Figure
5). T he plot shows the errors of the odd codes for the AD5232.
0000 0000
0000 0001
0000 0010
0000 0100
0000 1000
0001 0000
0010 0000
0100 0000
1000 0000
1111 1111
1111 1111
LEFT SHIFT
1111 1111
0111 1111
0011 1111
0001 1111
0000 1111
0000 0111
0000 0011
0000 0001
0000 0000
0000 0000
0000 0000
RIGHT SHIFT
LEFT
SHIFT
(+6 dB)
RIGHT
SHIFT
(
–
6 dB)
Figure 6. Detail Left and Right Shift Function for the
8-Bit AD5232
Actual conformance to a logarithmic curve between the data
contents in the RDAC register and the wiper position for each
Right Shift #4 and #5 command execution contains an error
only for the odd codes. Even codes are ideal except zero right
shift or greater than half-scale left shift. T he graph in Figure 7
shows plots of Log_Error [i.e., 20
×
log 10 (error/code)]. For
example, code 3 Log_Error = 20
×
log 10 (0.5/3) = –15.56 dB,
which is the worst case. T he plot of Log_Error is more signifi-
cant at the lower codes.
CODE, FROM 1 TO 255 BY 2
20
40
60
80 100
0
120 140 160 180 200 220 240 260
0
–
10
–
20
–
30
–
40
–
50
–
60
d
LOG_ERROR (CODE) FOR 8-BIT
Figure 7. Plot of Log_Error Conformance for Odd Codes
Only (Even Codes Are Ideal)
ADVANCE D CONT ROL MODE S
T he AD5232 digital potentiometer contains a set of user program-
ming features to address the wide applications available to these
universal adjustment devices. Key programming features include:
Independently Programmable Read and Write to all registers.
Simultaneous refresh of all RDAC wiper registers from
corresponding internal EEMEM registers.
Increment and Decrement instructions for each RDAC wiper
register.
Left and right bit shift of all RDAC wiper registers to achieve
6 dB level changes.
Nonvolatile storage of the present scratch pad RDAC register
values into the corresponding EEMEM register.
Fourteen extra bytes of user-addressable electrical-erasable memory.
Increment and Decrement Commands
T he increment and decrement commands (#14, #15, #6, #7)
are useful for the basic servo adjustment application. T his com-
mand simplifies microcontroller software coding by eliminating
the need to perform a readback of the current wiper position,
then add one to the register contents using the microcontroller’s
adder. T he microcontroller simply sends an increment command
(#14) to the digital POT , which will automatically move the
wiper to the next resistance segment position. T he master incre-
ment command (#15) will move all POT wipers by one position
from their present position to the next resistor segment position.
T he direction of movement is referenced to T erminal B. T hus
each increment #15 command will move the wiper tap position
farther away from T erminal B.
Logarithmic T aper Mode Adjustment
Programming instructions allow a decrement and an increment
wiper position control by individual POT or in a ganged POT
arrangement where both wiper positions are changed at the
same time. T hese settings are activated by the 6 dB decrement
and 6 dB increment instructions #4 and #5 and #12 and #13
respectively. For example, starting with the wiper connected to
T erminal B executing nine increment instructions (#12) would
move the wiper in +6 dB steps from the 0% of R
BA
(B terminal)
position to the 100% of R
BA
position of the AD5232 8-Bit
potentiometer. T he 6 dB increment instruction doubles the
value of the RDAC register contents each time the command is
executed. When the wiper position is greater than midscale, the
last 6 dB increment instruction will cause the wiper to go to the
Full-Scale 255 code position. Any additional +6 dB instruction
will no longer change the wiper position from full scale (RDAC
register code = 255).
Figure 6 illustrates the operation of the 6 dB shifting function
on the individual RDAC register data bits for the 8-bit AD5232
example. Each line going down the table represents a successive
shift operation. Very important: the left shift #12 and #13 com-
mands
were modified so that if the data in the RDAC register is
equal to zero and the data is left shifted, it is then set to code 1.
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