AD5232

Manufacturer Part NumberAD5232
Description2-Channel/ 256-Position Digital Potentiometer
ManufacturerAnalog Devices
AD5232 datasheet
 
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AD5232
Table X. Active Trimming of One POT Followed by a Save to
Nonvolatile Memory (PCB Calibrate)
SDI
SDO
Action
B040
XXXX
Loads 40
data into RDAC1 register,
H
H
H
Wiper W1 moves to 1/4 full-scale
position.
E0XX
B040
Increments RDAC1 register by one to
H
H
41
, Wiper W1 moves one resistor
H
segment away from terminal B.
E0XX
E0XX
Increments RDAC1 register by one to
H
H
42
, Wiper W1 moves one more
H
resistor segment away from terminal B.
Continue until desired wiper position
reached.
20XX
E0XX
Saves RDAC1 register data into
H
H
corresponding nonvolatile EEMEM1
memory ADDR = 0
EQUIPMENT CUSTOMER STARTUP SEQUENCE FOR A
PCB CALIBRATED UNIT WITH PROTECTED SETTINGS
PCB setting: Tie WP to GND [prevents changes in PCB
wiper set position]
Power V
and V
with respect to GND
DD
SS
Optional: Strobe PR pin [ensures full power ON preset of
wiper register with EEMEM contents in unpredictable supply
sequencing environments]
Table XI. Using Left Shift by One to Change Circuit Gain in
6 dB Steps
SDI
SDO
Action
C1XX
XXXX
Moves Wiper W2 to double the present
H
H
data value contained in RDAC2 regis-
ter, in the direction of the A terminal.
C1XX
XXXX
Moves Wiper W2 to double the present
H
H
data value contained in RDAC2 regis-
ter, in the direction of the A terminal.
Table XII. Storing Additional Data in Nonvolatile Memory
SDI
SDO
Action
3280
XXXX
Stores 80
data into spare EEMEM
H
H
H
location USER1.
3340
XXXX
Stores 40
data into spare EEMEM
H
H
H
location USER2.
Table XIII. Reading Back Data from Various Memory Locations
SDI
SDO
Action
94XX
XXXX
Prepares data read from USER3 location.
H
H
Assumption: USER3 previously loaded
with 80
.
H
00XX
XX80
NOP instruction #0 sends 16-bit word
H
H
out of SDO where the last 8 bits con-
tain the contents of USER3 location.
NOP command ensures device returns
to idle power dissipation state.
Analog Devices offers the AD5232EVAL board for sale to
simplify evaluation of these programmable devices controlled by
a personal computer via the printer port.
TEST CIRCUITS
Figures 13 to 22 define the test conditions used in the product
specification’s table.
.
H
V
MS2
V
~
V+
OFFSET
NC
DUT
I
W
A
W
B
V
MS
NC = NO CONNECT
DUT
V+ = V
DD
N
1LSB = V+/2
A
W
V+
B
V
MS
DUT
I
W
A
V
W
W
B
[
]
R
V
– V
/ I
V
W =
MS1
MS2
W
MS1
V
A
V+ = V
10%
DD
(
V
PSRR (dB) = 20 LOG
A
DD
W
V
V
MS %
B
PSS (%/%) =
V
MS
V
DD %
A
DUT
B
5V
W
~
V
IN
OP279
V
OUT
GND
OFFSET BIAS
)
MS
DD