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AD5232 Non-Volatile Memory Digital Potentiometers Evaluation Board User Manual
Rev. G 10/7/02
7 STEPS TO SETUP THE EVALUATION BOARD
1.
2.
Install AD5232 s/w from CD ROM
Download NTPORT.OCX from web
6. Open AD5232 Rev G.exe and program
resistance settings
4. Connect JP14
on Eval Board
3. Connect Parallel Port Cable
W1
B1
+5V
GND
7. Measure Result on Meter
5. Provide Power Supply
Figure 1. Evaluation Kit Setup
No Programming Skill or Programming
Language Required!
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STEPS FOR OPERATING AD5232 EVALUATION KIT
1.
Installing AD5232 Rev G Evaluation Software
a. Run setup.exe under D:\AD5232 Evaluation Software Package
b. During the installation, hit ignore or yes to bypass error messages if they occur.
(Users may need to install the s/w few times to get successful installation)
2. Enabling PC Parallel Port Communications
(In addition to installing AD5232 Rev G, users need to install a 3rd party driver, NTPORT.OCX from UCT, to gain
access of the PC parallel port. UCT offers a free trial of such driver)
a. Unzip ntport.zip from the CD Rom. If ntport.zip cannot be found, download it from
http://www.uct.on.ca/. Click Download NTPORT.OCX, Click NTPORT free trial (user is
obligated to pay a nominal license fee after 30 days free trial)
b. Save ntport.zip in default or specified directory
c. unzip and extract all to the specified directory
d. Run setup.exe
e. If it prompts file violations during installation, hit Ignore to bypass it.
f. The following instructions are for users running Windows 2000 and XP (For Win NT, skip
and jump to step g)
Users must ensure the file DLPORTIO.SYS is placed in Winnt\system32\drivers or
Windows\system32\drivers directory.
1. Run LOADDRV.EXE under c:\program files\project1 or the specified directory. A dialog box
will appear as
(Error Message: if windows prompts you some error messages such as ‘Can’t connect to
service control manager’, you need to contact the IS department to grant you an authority
for further installation)
2. Change pathname to
c:\winnt\system32\drivers\dlportio.sys
(For Windows 2000)
c:\windows\system32\drivers\dlportio.sys (For Windows XP)
3. Hit Install button, then Start button. If the status message states successful, the driver is
installed and operating. Click OK button.
4. Go to Device Manager
(For Win 2000, go to Control Panel – Systems – Hardware – Device Manager,
For Win XP, go to System Properties – Hardware – Device Manager)
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5. The “Non-Plug and Play Divers“ entry may not be visible at first. If not, click on the View
menu item in Device Manager and click on View Hidden Devices to make sure that hidden driver
files are listed. Then it should be visible.
(Note: If you do not see dlportio, reboot windows or redo LOADDRV.EXE and then reboot
windows.)
6. From the non-plug and play drivers list in Device Manager locate the dlportio device and
double-click.
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7. The dlportio properties page for the driver will be shown. At Driver tab, select Current Status as
Start and Startup Type as AUTOMATIC.
(Note: If Startup is not active and you cannot change Type, your computer may be
administered by your IS department. You may need to consult them to change your PC
administrative setting)
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g.
The following instructions are for users running Windows NT only
Users must ensure that the file: DLPORTIO.SYS is placed in the Winnt\system32\drivers
directory. In order to load the DLPORTIO.SYS driver; use the driver loader program
LOADDVR.EXE
1. Open c:\program files\project1\loaddrv.exe
A dialog box will be appear as
(Error Message: if windows prompts you some error messages such as ‘Can’t connect to
service control manager’, you need to contact the IS department to grant you an authority
for further installation)
2. The pathname for DLPORTIO.SYS must be changed accordingly to the following operating
systems:
c:\winnt\system32\drivers\dlportio.sys
3. Hit Install button, then Start button. If the status message states successful, the driver is
installed and operating. Click OK button.
4. Automatic Driver Loading Under Windows NT
Once the DLPORTIO.SYS driver has been installed and run on an NT system it can be made to
start automatically every time NT is started. To place the driver into this mode select the
DEVICES icon from the Windows NT Control Panel. From “Devices” dialog box that will
appear select dlportio and click on the Startup... button
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5. The device Startup Type dialog box will be shown as illustrated below. From the option
buttons select Automatic. The driver will now automatically start each time that Windows NT is
restarted.
Note
Due to the large variations in computer platforms and configurations, Analog Devices, Inc. cannot guarantee this
software to work on all systems. Should you encounter problem, you may consult
www.analogdigitalpotentiometers@analog.com or call 1-408-382-3082 for application support.
Uninstall
To uninstall AD5232 and NTPORT, use Add/Remove Programs in Control Panel
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3.
Connect Parallel Port Cable to LPT1
4.
Evaluation Board Configuration
1. For single supply, connect JP14 and JP13 to ground Vss of U1 and U3, apply 5V to pin +5V
(Some boards do not come with jumper caps. Users should get suitable caps or simply short the
jumpers for proper operations)
2. For dual supplies, connect JP15 and JP12 to provide –2.5V to Vss of U1 and U3, apply +2.5V to pin +5V
and –2.5V to pin –5V
3. The states of PR, WP, and RDY can be selected from the DIP switches provided.
4. SDO can be monitored TPSDO. 1k to 10kohm pull-up resistors are needed for both SDO and RDY pins.
5.
Apply Power Supply according Step 4.1 and 4.2.
6.
How to Use The Evaluation Board
1. Open AD5232 Rev G.exe from Windows Start - Programs - AD5232 Rev G, the program is shown in
Figure 2.
2. Users can use Direct Control such as moving the scroll bars or pressing the buttons to control the devices.
Users can also adjust the Bit Pattern and then hit Run to program the device. Their operations are selfexplanatory.
3. User can also approximate RWA and RWB by first entering the measured RAB after power is applied.
Figure 2. AD5232 Software Graphical Interface
7.
Measure Result
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Evaluation Board Schematic
General purpose opamp AD820, U3A can be configured as various building block circuits in conjunction with
AD5235 for various circuit evaluations, see appendix. Other opamps in P-DIP can replace AD820.
For single supply, 2.5V Voltage reference AD1582 can be used to offset opamp bias point for AC operation.
AD5232/AD5235 Main Circuit
+5 (Lower to +2.5 if Dual Supplies)
+5V
1
J1
1
2
1
2
1
2
1
2
9
2
8
2
7
1
6
1
5
1
4
1
3
1
2
1
1
R R R
10 10 10
DGND
U1A
TPSDO
1
2
3
4
TP/CS
TPCLK
+5
TPSDI
R1
1k
16 151413
SDI
CS
CLK RDY
SDO
PR
GND
WP
VSS
VDD
A2
A1
C10 C11
4.7u 0.1u
High
TPRDY
TP/PR
TP/WP 1
2
3
4
12
11
10
9
S1
R_SDI100
100
DB25
JP14
Note
Header
1. Signal Ground with Net DGND
JP15
2. Power Ground with Net AGND
U1B
16
1
CLK RDY 15
2
SDI CS 14
3
SDO PR
4
13
GND WP
5
VSS VDD 12
6
11
A1
A2
7
W1 W2 910
8
B1
B2
AD5232/AD5235TSSOP
GND
1
C13
C12
4.7u
0.1u
8
7
6
5
SW-
W1 B1 B2W2
5 6 7 8 AD5235CSP
R_/CS
R_CLK100
Low
1
A1
1
W1
1
B1
1
A2
1
W2
1
B2
-5V
1
Header
-5
(Lower to -2.5V if Dual Supplies)
Additional Opamp For General Purpose
V+
V1
JP5
Header
JP7
Vo
1
JP6
JP8
JP4
+5
C5
0.1
7
1,5,
Header
Vi_DC
1
JP2
JP3
Vi_AC
1
U2
GND
3
Vi
VOUT
0.1u AD1582
+5
C7
C9
Header
1
2.5VR
2
3
JP1
6
U3
AD820AR
Vo
JP10 JP11
4
Header
-5
2
1
JP9
JP12
JP13
Head
C6
Head
+5
0.1u
2
C8
1u
3
1
7
U3
8
6
5
4AD820
Replacable Opamp in
Figure 3. Evaluation Board Schematic
Note
Should you encounter problem, you may consult www.analogdigitalpotentiometers@analog.com or call 1-408-3823082 for application support. If you are interested of the source code, you may contact alan.li@analog.com for
further information.
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Table 1. AD5232 16-bit Serial Data Word
MSB
C3
C2
C1
C0
A3
A2
A1
A0
D7
D6
D5
D4
D3
D2
D1
L
SB
D0
Command bits are identified as Cx, address bits are Ax, and data bits are Dx. Command instruction codes are defined in table 2.
Table 2. AD5232 Dual 8-bit Instruction/Operation Truth Table
Inst
No.
Instruction Byte 1
B15 •••••••••••••••• B8
Data Byte 0
B7 •••••••••••••••••••• B0
0
C3 C2 C1 C0 A3 A2 A1 A0
0 0 0 0 X X X X
D7 D6 D5 D4 D3 D3 D2 D1 D0
X X X X X X X X X
NOP: Do nothing
1
0
0
0
1
<< ADDR >>
X
X
X
X
X
X
X
X
X
Write contents of EEMEM to RDAC Register
2
0
0
1
0
<< ADDR >>
X
X
X
X
X
X
X
X
X
SAVE WIPER SETTING: Write contents of RDAC
to EEMEM
3
0
0
1
1
<< ADDR >>
D7 D6 D5 D4 D3 D3 D2 D1 D0
Write contents of Serial Register Data Byte 0 to
EEMEM
4
0
1
0
0
<< ADDR >>
X
X
X
X
X
X
X
X
X
DEC 6dB: Right Shift contents of RDAC, LSB rolls
over to MSB position
5
0
1
0
1
X
X
X
X
X
X
X
X
X
X
X
DEC All 6dB: Right Shift contents of all RDAC
Registers, LSB rolls over to MSB position
6
0
1
1
0
<< ADDR >>
X
X
X
X
X
X
X
X
X
Decrement contents of RDAC by One, does not
rollover at zero-scale
7
0
1
1
1
X
X
X
X
X
X
X
X
X
X
X
X
X
Decrement contents of all RDAC Registers by One,
does not rollover at zero-scale
8
1
0
0
0
0
0
0
0
X
X
X
X
X
X
X
X
X
RESET: Load all RDACs with their corresponding
EEMEM previously-saved values
9
1
0
0
1
<< ADDR >>
X
X
X
X
X
X
X
X
X
Write contents of EEMEM to Serial Register Data
Byte 0. SDO activated
10
1
0
1
0
<< ADDR >>
X
X
X
X
X
X
X
X
X
Write contents of RDAC to Serial Register Data
Byte 0. SDO activated
11
1
0
1
1
<< ADDR >>
D7 D6 D5 D4 D3 D3 D2 D1 D0
Write contents of Serial Register Data Byte 0 to
RDAC
12
1
1
0
0
<< ADDR >>
X
X
X
X
X
X
X
X
X
INC 6dB: Left Shift contents of RDAC, stops at all
ones
13
1
1
0
1
X
X
X
X
X
X
X
X
X
X
X
INC All 6dB: Left Shift contents of all RDAC
Registers, stops at all ones
14
1
1
1
0
<< ADDR >>
X
X
X
X
X
X
X
X
X
Increment contents of RDAC by One, does not
rollover at full-scale
15
1
1
1
1
X
X
X
X
X
X
X
X
X
X
Increment contents of all RDAC Registers by One,
does not rollover at full-scale
X
X
X
X
X
X
X
Operation
NOTES:
1.
The SDO output shifts-out the last 16-bits of data clocked into the serial register for daisy chain operation. Exception, following Instruction
#9 or #10 the selected internal register data will be present in data byte 0 & 1. Instructions following #9 & #10 must be a full 24-bit data
word to completely clock out the contents of the serial register.
2.
The RDAC register is a volatile scratch pad register that is refreshed at power ON from the corresponding non-volatile EEMEM register.
3.
The increment, decrement and shift commands ignore the contents of the shift register Data Byte 0.
4.
Execution of the Operation column noted in the table takes place when the CS strobe returns to logic high.
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APPLICATION PROGRAMMING EXAMPLES
PCB setting: Tie WP to GND [prevents changes in PCB
wiper set position]
Power VDD & VSS with respect to GND
Optional: Strobe PR pin [insures full power ON preset of
wiper register with EEMEM contents in unpredictable
supply sequencing environments]
The following command sequence examples have been
developed to illustrate a typical sequence of events for the
various features of the AD5232 nonvolatile digital
potentiometer. [PCB = Printed Circuit Board containing the
AD523X part]. Instruction numbers (Commands),
addresses and data appearing at SDI and SDO pins are
listed in hexadecimal.
SDI
SDO
Action
B140H
XXXXH
Loads 40H data into RDAC2 register,
Wiper W2 moves to 1/4 full-scale
position
B080H
B140H
Loads 80H data into RDAC1 register,
Wiper W1 moves to 1/2 full-scale
position
Table 5 Equipment customer startup sequence for a PCB
calibrated unit with protected settings
SDI
SDO
Action
C1XXH
XXXXH
Moves wiper W2 to double the present
data value contained in RDAC2
register, in the direction of the A
terminal
C1XXH
XXXXH
Moves wiper W2 to double the present
data value contained in RDAC2
register, in the direction of the A
terminal
Table 3. Set two digital POTs to independent data values
SDI
SDO
Action
B040H
XXXXH
Loads 40H data into RDAC1
register, Wiper W1 moves to 1/4
full-scale position
E0XXH
E0XXH
B040H
E0XXH
Table 6. Using Left shift by one to change circuit gain in
6dB steps
Increments RDAC1 register by one
to 41H, Wiper W1 moves one
resistor segment away from
terminal B.
Increments RDAC1 register by one
to 42H, Wiper W1 moves one more
resistor segment away from
terminal B.
E0XXH
SDO
Action
3280H
XXXXH
Stores 80H data into spare EEMEM
location USER1
3340H
XXXXH
Stores 40H data into spare EEMEM
location USER2
Table 7. Storing additional data in nonvolatile memory
Continue until desired wiper position reached
20XXH
SDI
Saves RDAC1 register data into
corresponding nonvolatile
EEMEM1 memory ADDR=0H
SDI
SDO
Action
94XXH
XXXXH
Prepares data read from USER3
location. Assumption USER3
previously loaded with 80H
NOP instruction #0 sends 16-bit word
out of SDO where the last 8 bits
contain the contents of USER3
location. NOP command insures device
returns to idle power dissipation state.
Table 8. Reading back data from various memory locations
00XXH
Table 4. Active trimming of one POT followed by a save to
nonvolatile memory (PCB calibrate)
10
XX80H
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APPENDIX
APPLICATIONS
AD5232/AD5235/ADN2850
1
16
CLK RDY
2
15
SDI
CS
3
14
SDO
PR
4
13
GND WP
5
12
VSS VDD
6
11
A1*
A2*
7
10
W1
W2
8
9
B1
B2
JP15
RDAC
A
R2
B
external
U1
+5 (+2.5V)
7
R1
external
R2
-INPUT
-5 (-2.5V)
Vi_DC
Vo
1,5,8
2
1
Vo
AD820AR
JP1
4
JP3
6
U3
3
1
Vi_AC
JP12
C9
1
- R2/(R1+RAB)*Vi < Vo < -(R2+RAB)/R1*Vi
-5 (-2.5V)
1
Bipolar Unity Gain Amplifier
1
1
A2* (Input Signal Here)
AD5232/AD5235/ADN2850
1
16
CLK RDY
-INPUT
2
15
SDI
CS
FB
3
14
SDO
PR
4
13
GND WP
5
12
VSS VDD
R
R
Vo
6
11
A1*
A2*
7
10
external
JP8
W1
W2
+5 (+2.5V)
8
9
B1
B2
JP4
U1
1,5,8
2
6
U3
JP2
3
AD820AR
R
R
7
Vi
A
Vo
RDAC
Vo
4
B
JP12
-1 < Vo/Vi < 1
-5 (-2.5V)
R
R1
A
iS
JP15
Vo
JP7
R
JP6
U1
+5 (+2.5V)
7
RDAC
Vi_DC
B
Vo
D1
-5 (-2.5V)
1,5,8
2
1
3
6
U3
AD820AR
JP1
4
D1
R1
1
High Sensitivity I-V Converter
-INPUT
1
FB
AD5232/AD5235/ADN2850
1
16
CLK RDY
2
15
SDI
CS
3
14
SDO
PR
4
13
GND WP
5
12
VSS VDD
6
11
A1*
A2*
7
10
W1
W2
8
9
B1
B2
1
Vi
Vo
R1
1
Inverting Gain & Attentuator
JP12
Vo = -k*R*iS
k = 1 + RWB/R1 + RWB/R
-5 (-2.5V)
11
Vo
a
A
D
5232/A
D
5235/A
D
N
2850
1
CLKRD
Y
2
SD
I
CS
3
SD
O PR
4
G
N
D W
P
5
V
SSV
D
D
6
A
1* A
2*
7
W
1 W
2
8
B1
B2
BuferedV
o
Buffered
Voltage
Output
V
i
JP14
A
16
15
14
13
12
11
10
9
V
i_A
C
FB
(D
on'tuseV
i_D
C)
1
JP8
1
+5
JP4
U
1
1,5,8
7
2
V
o
JP2
RD
A
C
4
U
3
3
6
V
o
A
D
820A
R
B
JP13
R1
Vi
A
RDAC
B
-INPUT
Vo
1
1
Inverting Linear Gain & Attentuator
AD5232/AD5235/ADN2850
1
16
CLK RDY
2
15
SDI
CS
3
14
SDO
PR
4
13
GND
WP
5
12
VSS VDD
6
11
A1*
A2*
7
10
W1
W2
8
9
B1
B2
+5 (+2.5V)
U1
7
JP15
R1
Vo
6
U3
3
Vo
AD820AR
JP1
Vi_DC
4
-5 (-2.5V)
1,5,8
2
JP4 JP6
1
JP12
G = - RWB/R1
Vo=-Vi*(D*RAB)/(2^n*R1)
-5 (-2.5V)
A
RDAC
U1
B
+5 (+2.5V)
JP4
JP15
7
Vi
Vi_DC
Vo
Vo
1
Inverting Quasi Log Gain & Attentuator
-INPUT
1
1
AD5232/AD5235/ADN2850
1
16
CLK RDY
2
15 FB
SDI
CS
3
14
SDO
PR
4
13
GND
WP
5
12
VSS VDD
6
11
A1*
A2*
7
10
W1
W2
8
9
B1
B2
1,5,8
2
1
3
JP3
Vo
AD820AR
JP1
4
-5 (-2.5V)
6
U3
Vi_AC
C9
JP12
1
G = - RWB/RWA
Vo=-Vi*(D/2^n-1)
-5 (-2.5V)
1
FB
AD5232/AD5235/ADN2850
1
16
CLK RDY
2
15
-INPUT
SDI
CS
3
14
SDO
PR
4
13
GND
WP
5
12
VSS VDD
R2
6
11
A1*
A2*
7
10
JP8
W1
W2
+5 (+2.5V)
8
9
B1
B2
JP4
U1
RDAC
B
R2
7
A
JP15
2
Vi_DC
Vo
3
1
AD820AR
JP3 JP1
-5 (-2.5V)
G = - R2/RWA
Vo=-Vi*(2^n*R2)/((2^n-D)*RAB)
Vi_AC
C9
JP12
1
-5 (-2.5V)
12
1,5,8
6
U3
4
Vi
1
Vo
1
Inverting Exponential Gain & Attentuator
Vo
a
AD5232/AD5235/ADN2850
1
16
CLK RDY
2
15
SDI
CS
3
14
SDO
PR
4
13
GND WP
5
12
VSS VDD
6
11
A1*
A2*
7
10
W1
W2
8
9
B1
B2
R1
A
RDAC B
U1
JP14 JP5
-INPUT
Vo
1
1
Non-Inverting Linear Gain
+5
R1
7
JP6
1,5,8
2
Vi_DC
Vo
Vi
1
JP2
3
6
U3
Vo
4
AD820AR
JP13
G = 1 + RWB/R1
Vo=Vi*(1+D*RAB/(2^nR1))
RDAC B
1
Vo
U1
JP14
+5
7
A
-INPUT
1
Non-Inverting Quasi Log Gain
1
GND
AD5232/AD5235/ADN2850
1
16
CLK RDY
2
15
SDI
CS
3
14
SDO
PR
4
13
GND WP
5
12
VSS VDD
6
11
A1*
A2*
7
10
W1
W2
8
9
B1
B2
1,5,8
2
Vi_DC
Vo
Vi
JP2
1
3
6
U3
Vo
AD820AR
4
JP3
Vi_AC
G = 1 + RWB/RWA
Vo=Vi*(1+D/(2^n-D))
JP13
C9
1
A
RDAC
B
R2
R2
JP8
+5
U1
7
JP14
Vo
1
-INPUT
1
Non-Inverting Exponential Gain
1
GND
AD5232/AD5235/ADN2850
1
16
CLK RDY
2
15
SDI
CS
3
14
SDO
PR
4
13
GND WP
5
12
VSS VDD
6
11
A1*
A2*
7
10
W1
W2
8
9
B1
B2
2
Vi
Vo
Vi_DC
JP2
1
3
U3
1,5,8
6
AD820AR
4
JP3
G = 1 + R2/RWA
Vo=Vi*(1+2^nR2/((2^n-D)RAB))
Vi_AC
JP13
C9
1
13
Vo
a
+5 (+2.5V)
AD5232/AD5235/ADN2850
1
16
CLK RDY
2
15
SDI
CS
3
14
SDO
PR
4
13
GND WP
5
12
VSS VDD
6
11
A1*
A2*
JP15 7
10
W1
W2
8
9
B1
B2
+2.5
R1
1M, 0.1%
R1
external
-INPUT JP8
U1
R2
external
A
-5 (-2.5V)
1,5,8
2
Vo
RDAC
Vo
+5 (+2.5V)
7
Ultra Fine Adjustment
3
6
U3
Vo
AD820AR
B
4
-5 (-2.5V) JP1
JP12
R2
1M, 0.1%
-5 (-2.5V)
-2.5
VW = V+*(RWB/(R2+RAB) -V-*(RWA/(R1+RAB))
AD5232/AD5235/ADN2850
1
16
CLK RDY
2
15
SDI
CS
3
14
SDO
PR
4
13
GND WP
5
12
VSS VDD
6
11
A1*
A2*
JP15 7
10
W1
W2
8
9
B1
B2
R1
Vi
R2
R1
FB
R2
-INPUT
external
JP4
U1
Vo
JP8
+5 (+2.5V)
7
Phase Shifter
1,5,8
2
B
RDAC
-5 (-2.5V)
JP2
3
C1
C1
JP1
Vi_AC
6
U3
Vo
AD820AR
4
A
Vo
1
JP12
G = 180 - 2tan^-1wRC
-5 (-2.5V)
Level Detector
VA
A
RDAC
JP2
-5 (-2.5V)
JP8
+5 (+2.5V)
7
AD5232/AD5235/ADN2850
1
16
CLK RDY
2
15
SDI
CS
3
14
SDO
PR
4
13
GND WP
5
12 +5 (+2.5V)
VSS VDD
6
11
A1*
A2*
JP15 7
10
W1
W2
8
9
B1
B2
JP4
U1
2
3
U3
Vo
6
AD820AR
4
B
1,5,8
Vref
JP13
VB
14
Vo
a
PCB LAYOUT
Figure 4. Evaluation Board Layout
PCB LAYOUT CONSIDERATION
To stabilize voltage supplies, bypassed +5V and –5V with a 4.7u or 10uF capacitor with proper polarities. Add
0.1uF decoupling capacitors, very close to the supply pins of active component, can minimize high frequency noise
as well.
15
a
AD5232 Parallel Port Connection (For Visual Basic Program Developer Only. Users Can Ignore)
/PR (not used) /CS CLK SDI
GND
SDO
http://www.doc.ic.ac.uk/~ih/doc/par/
8 output pins accessed via the DATA Port
5 input pins (one inverted) accessed via the STATUS Port 4
output pins (three inverted) accessed via the CONTROL Port
The remaining 8 pins are grounded
(NTPORT1.Address = 888)
(NTPORT1.Address = 889)
(NTPORT1.Address = 890)
TIMING DEFINATION IN VISUAL BASIC SOURCE CODE cmdRUN
(For Visual Basic Program Developer Only. Users Can Ignore)
bit 3
(Pin 5)
bit 2
(Pin 4)
bit 1
(Pin 3)
bit 0
(Pin 2)
/PR
/CS
CLK
SDI
Binary Code
1100 1001 1011 1000 1010
Decimal Code
12
No Activity
9
11
Send out
BIT_TOGO=1
8
10
Send out
BIT_TOGO=0
16
1100
12
Latch Data