AD5232 Analog Devices, AD5232 Datasheet - Page 14

• Manufacturer Part Number: AD5232
• Description: 2-Channel/ 256-Position Digital Potentiometer
• Manufacturer: Analog Devices

Table X. Active Trimming of One POT Followed by a Save to
Nonvolatile Memory (PCB Calibrate)
SDI
B040
E0XX
E0XX
20XX
EQUIPMENT CUSTOMER STARTUP SEQUENCE FOR A
PCB CALIBRATED UNIT WITH PROTECTED SETTINGS
Table XI. Using Left Shift by One to Change Circuit Gain in
6 dB Steps
SDI
C1XX
C1XX
SDI
3280
3340
SDI
94XX
00XX
AD5232
Table XIII. Reading Back Data from Various Memory Locations
PCB setting: Tie WP to GND [prevents changes in PCB
wiper set position]
Power V
Optional: Strobe PR pin [ensures full power ON preset of
wiper register with EEMEM contents in unpredictable supply
sequencing environments]
Table XII. Storing Additional Data in Nonvolatile Memory
H
H
H
H
H
H
H
H
H
H
DD
SDO
XXXX
B040
E0XX
E0XX
SDO
XXXX
XXXX
SDO
XXXX
XXXX
SDO
XXXX
XX80
and V
H
H
H
H
H
SS
H
H
H
H
H
with respect to GND
Action
Loads 40
Wiper W1 moves to 1/4 full-scale
position.
Increments RDAC1 register by one to
41
segment away from terminal B.
Increments RDAC1 register by one to
42
resistor segment away from terminal B.
Continue until desired wiper position
reached.
Saves RDAC1 register data into
corresponding nonvolatile EEMEM1
memory ADDR = 0
Action
Moves Wiper W2 to double the present
data value contained in RDAC2 regis-
ter, in the direction of the A terminal.
Moves Wiper W2 to double the present
data value contained in RDAC2 regis-
ter, in the direction of the A terminal.
Action
Stores 80
location USER1.
Stores 40
location USER2.
Action
Prepares data read from USER3 location.
Assumption: USER3 previously loaded
with 80
NOP instruction #0 sends 16-bit word
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.
H
H
, Wiper W1 moves one resistor
, Wiper W1 moves one more
H
.
H
H
H
data into RDAC1 register,
data into spare EEMEM
data into spare EEMEM
H
.
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.
V+
V
MS2
~
OFFSET
V
DD
GND
V
V+
A
A
B
B
DUT
A
V
W
IN
W
NC
A
~
DUT
A
B
V
B
A
DUT
OFFSET BIAS
V
MS
DUT
W
W
W
NC = NO CONNECT
V
MS1
W
B
PSRR (dB) = 20 LOG
PSS (%/%) =
V+ = V
I
W
OP279
V
V+ = V
1LSB = V+/2
MS
R
W =
DD
I
V
5V
W
[
MS
DD
V
MS1
10%
N
– V
V
V
DD %
MS %
MS2
V
OUT
]
(
/ I
W
V
V
MS
DD
)