CAT525
Configured Digitally Programmable Potentiometer (DPP™): Programmable Voltage Applications
FEATURES
s
Four 8-bit DPPs configured as programmable
APPLICATIONS
s
Automated product calibration
s
Remote control adjustment of equipment
s
Offset, gain and zero adjustments in
voltage sources in DAC-like applications
s
Independent reference inputs
s
Buffered wiper outputs
s
Non-volatile NVRAM memory wiper storage
s
Output voltage range includes both supply rails
s
4 independently addressable buffered
self-calibrating and adaptive control systems
s
Tamper-proof calibrations
s
DAC (with memory) substitute
output wipers
s
1 LSB accuracy, high resolution
s
Serial
µ
P interface
s
Single supply operation: 2.7V-5.5V
s
Setting read-back without effecting outputs
DESCRIPTION
The CAT525 is a quad 8-Bit digitally programmable
potentiometer (DPP™) configured for programmable
voltage and DAC-like applications. Intended for final
calibration of products such as camcorders, fax ma-
chines and cellular telephones on automated high vol-
ume production lines and systems capable of self cali-
bration, it is also well suited for applications were equip-
ment requiring periodic adjustment is either difficult to
access or located in a hazardous environment.
The CAT525 offers four independently programmable
DPPs each having its own reference inputs and each
capable of rail to rail output swing. The wipers are
buffered by rail to rail op amps. Wiper settings, stored in
non-volatile NVRAM memory, are not lost when the
device is powered down and are automatically rein-
FUNCTIONAL DIAGRAM
V
H1
REF
V
H3
REF
V
H4
REF
19
V
H2
REF
2
1
20
stated when power is returned. Each wiper can be
dithered to test new output values without effecting the
stored settings and stored settings can be read back
without disturbing the DPP’s output.
Control of the CAT525 is accomplished with a simple 3
wire serial interface. A Chip Select pin allows several
CAT525's to share a common serial interface and
communications back to the host controller is via a single
serial data line thanks to the CAT525’s Tri-Stated Data
Output pin. A RDY/BSY output working in concert with
an internal low voltage detector signals proper operation
of non-volatile NVRAM Memory Erase/Write cycle.
The CAT525 is available in the 0°C to 70°C commercial
and –40°C to 85°C industrial operating temperature
ranges and offered in 20-pin plastic DIP and Surface
mount packages.
PIN CONFIGURATION
DIP Package (P)
SOIC Package (J)
VREF H2
VREF H1
DVD
CLK
RDY/BSY
CS
DI
DO
PROG
GND
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
VREF H3
VREF H4
VOUT1
VOUT2
VOUT3
VOUT4
VREF L4
VREF L3
VREF L2
VREF L1
RDY/BSY
5
+
PROG
9
PROGRAM
CONTROL
–
18
VOUT1
VREF H2
VREF H1
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
VREF H3
VREF H4
VOUT1
VOUT2
VOUT3
VOUT4
VREF L4
VREF L3
VREF L2
VREF L1
+
–
17
VOUT2
DVD
CLK
CLK
4
DATA
CONTROLLER
NVRAM
+
–
16
V
3
OUT
CS
6
RDY/BSY
7
+
–
7K
(ea)
15
VOUT4
CS
DI
DO
CAT525
14
13
12
11
CAT525
14
13
12
11
H.V.
CHARGE
PUMP
SERIAL
DATA
OUTPUT
REGISTER
8
DO
PROG
11
12
13
14
VREFL4
CAT525
GND
VREFL2
V
L1
REF
VREFL3
© 2001 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
1
Doc. No. 25078-00 4/01-A M-1
CATALYST [ CATALYST SEMICONDUCTOR ]
