CAT524 Catalyst Semiconductor, CAT524 Datasheet

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CAT524

Manufacturer Part Number
CAT524
Description
Configured Digitally Programmable Potentiometer (DPP): Programmable Voltage Applications
Manufacturer
Catalyst Semiconductor
Datasheet

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© 2001 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
CAT524
Configured Digitally Programmable Potentiometer (DPP™): Programmable Voltage Applications
FEATURES
DESCRIPTION
The CAT524 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
machines and cellular telephones on automated high
volume production lines, it is also well suited for
self-calibrating systems and for applications where
equipment which requires periodic adjustment is either
difficult to access or in a hazardous environment.
The four independently programmable DPPs have an
output range which includes both supply rails. 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 automati-
cally reinstated when power is returned. Each wiper can
be dithered to test new output values without effecting
FUNCTIONAL DIAGRAM
PROG
Four 8-bit DPPs configured as programmable
voltage sources in DAC-like applications
Common reference inputs
Buffered wiper outputs
Non-volatile NVRAM memory wiper storage
Output voltage range includes both supply rails
4 independently addressable buffered
output wipers
1 LSB accuracy, high resolution
Serial P interface
Single supply operation: 2.7V-5.5V
Setting read-back without effecting outputs
CLK
CS
DI
7
5
2
4
CAT524
PROGRAM
CONTROL
CONTROL
RDY/BSY
SERIAL
GND
3
8
NVRAM
V
1
DD
V
REF
V
REF
L
14
9
H
REGISTER
OUTPUT
SERIAL
DATA
+
+
+
+
13
12
11
10
6
V
V
V
V
DO
OUT
OUT
OUT
OUT
1
2
3
4
1
the stored settings, and stored settings can be read back
without disturbing the DPP’s output.
The CAT524 is controlled with a simple 3 wire serial
interface. A Chip Select pin allows several devices to
share a common serial interface. Communication back
to the host controller is via a single serial data line thanks
to the Tri-Stated CAT524 Data Output pin. A RDY/BSY
output working in concert with an internal low voltage
detector signals proper operation of the non-volatile
NVRAM memory Erase/Write cycle.
The CAT524 is available in the 0 to 70 C commercial
and –40 C to 85 C industrial operating temperature
ranges. Both 14-pin plastic DIP and SOIC packages are
offered.
RDY/BSY
APPLICATIONS
PROG
V DD
CLK
Automated product calibration
Remote control adjustment of equipment
Offset, gain and zero adjustments in
self-calibrating and adaptive control systems
Tamper-proof calibrations
DAC (with memory) substitute
DO
CS
DI
DIP Package (P)
1
2
3
4
5
6
7
CAT
524
14
13
12
11
10
PIN CONFIGURATION
9
8
V REF H
V OUT 1
V OUT 2
V OUT 3
V OUT 4
V REF L
GND
RDY/BSY
PROG
V DD
CLK
DO
CS
DI
Doc. No. 25076-00 4/01 M-1
SOIC Package (J)
1
2
3
4
5
6
7
CAT
524
14
13
12
11
10
9
8
V REF H
V OUT 1
V OUT 2
V OUT 3
V OUT 4
V REF L
GND

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CAT524 Summary of contents

Page 1

... NVRAM memory Erase/Write cycle. The CAT524 is available in the commercial and – industrial operating temperature ranges. Both 14-pin plastic DIP and SOIC packages are offered. ...

Page 2

... CAT524 ABSOLUTE MAXIMUM RATINGS* Supply Voltage V to GND ...................................... –0.5V to +7V DD Inputs CLK to GND ............................ –0. GND .............................. –0. GND ............................... –0. PROG to GND ........................ –0. GND ........................ –0. REF GND ......................... –0. REF Outputs D to GND ............................... –0. ...

Page 3

... L see note pF +5V LOAD pF +3V LOAD MHz MHz OUT / CAT524 Min Typ Max Units 0.99 V 0.995 V — — 0.005 V 0. — — 1 — — 100 k — — ...

Page 4

... CAT524 A. C. TIMING DIAGRAM Doc. No. 25076-00 Rev. 4/01 M-1 4 ...

Page 5

... CLOCK The CAT524’s clock controls both data flow in and out of the IC and EEPROM memory cell programming. Serial data is shifted into the DI pin and out of the DO pin on the clock’s rising edge. While it is not necessary for the clock ...

Page 6

... DATA OUTPUT Data is output serially by the CAT524, LSB first, via the Data Out (DO) pin following the reception of a start bit and two address bits by the Data Input (DI). becomes active whenever CS goes high and resumes its high impedance Tri-State mode when CS returns low ...

Page 7

... EEPROM then a change would occur at the read cycle’s conclusion. TEMPORARILY CHANGE OUTPUT The CAT524 allows temporary changes in DAC’s output to be made without disturbing the settings retained in EEPROM memory. This feature is particularly useful when testing for a new output setting and allows for user adjustment of preset or default values without losing the original factory settings ...

Page 8

... R = ——————————— DPP V L REF + OFFSET + -V REF – -V for Dual Power Supply Systems 15K 10 F 1N5231B 5. REF CAT524 + CAT514 – LM 324 GND V L REF 4.02 K 1.00K Digitally Controlled Voltage Reference + ) - (V ) REF OFFSET OFFSET 1 A ...

Page 9

... WINDOW 2 + – + – 10K +5V WINDOW 3 + – + – 10K +5V WINDOW 4 + – + – 10K +5V WINDOW 5 + – Overlapping Window Comparator 9 CAT524 REF WINDOW 1 1 WINDOW 2 2 WINDOW 3 3 WINDOW 4 4 WINDOW 5 WINDOW STRUCTURE V REF WINDOW OUT WINDOW OUT WINDOW OUT WINDOW 4 ...

Page 10

... CONTROL & DATA +5V CONTROL CAT524 & DATA GND Doc. No. 25076-00 Rev. 4/01 M-1 +5V 2. REF H 4.7 A LM385-2.5 +15V DPP + +5V – 10K 10K CAT524 DPP + – 5M GND REF 10K Current Sink with 4 Decades of Resolution 51K + – 10K REF 5M 5M DPP – ...

Page 11

... Digital Stereo Control 0. TREB CAP BASS CAP 0. OUTPUT 1 Z LM1040 LOUDNESS VOLUME BALANCE BYPASS TREBLE BASS 15 OUTPUT 2 0. BASS CAP 21 TREB CAP STEREO 24 0.01 F GND ENHANCE 12 GND Doc. No. 25076-00 Rev. 4/01 CAT524 +12V 0.1 F OUT 1 OUT 2 ...

Page 12

... ORDERING INFORMATION Prefix Device # CAT 524 Optional Product Company ID Number Notes: (1) The device used in the above example is a CAT524JI-TE13 (SOIC, Industrial Temperature, Tape & Reel) Doc. No. 25076-00 Rev. 4/01 M-1 Suffix J I Package P: PDIP J: SOIC Temperature Range Blank = Commercial (0˚C to +70˚ Industrial (-40˚C to +85˚C) ...

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