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CAT525PI

更新时间： 2024-11-28 23:40:03
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其他 - ETC 数字电位计
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12页 87K
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Digital Potentiometer

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CAT525PI 数据手册

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CAT525  
Configured Digitally Programmable Potentiometer (DPP™): Programmable Voltage Applications  
APPLICATIONS  
FEATURES  
■ Automated product calibration  
■ Four 8-bit DPPs configured as programmable  
voltage sources in DAC-like applications  
■ Remote control adjustment of equipment  
■ Independent reference inputs  
■ Offset, gain and zero adjustments in  
self-calibrating and adaptive control systems  
■ Buffered wiper outputs  
■ Tamper-proof calibrations  
■ Non-volatile NVRAM memory wiper storage  
■ Output voltage range includes both supply rails  
■ DAC (with memory) substitute  
■ 4 independently addressable buffered  
output wipers  
■ 1 LSB accuracy, high resolution  
■ Serial Microwire-like interface  
■ Single supply operation: 2.7V-5.5V  
■ Setting read-back without effecting outputs  
DESCRIPTION  
test new output values without effecting the stored  
settings and stored settings can be read back without  
disturbing the DPP’s output.  
The CAT525 is a quad 8-bit digitally programmable  
potentiometer (DPP™) configured for programmable  
voltage and DAC-like applications. Intended for final  
calibrationofproductssuchascamcorders,faxmachines  
and cellular telephones on automated high volume  
production lines and systems capable of self calibration,  
it is also well suited for applications were equipment  
requiring periodic adjustment is either difficult to access  
or located in a hazardous environment.  
Control of the CAT525 is accomplished with a simple 3  
Microwire-like 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 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  
deviceispowereddownandareautomaticallyreinstated  
when power is returned. Each wiper can be dithered to  
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.  
FUNCTIONAL DIAGRAM  
PIN CONFIGURATION  
V
V
REF H3  
REF H1  
V
V
REF H4  
REF H2  
2
1
20  
19  
SOIC Package (J)  
DIP Package (P)  
5
9
RDY/BSY  
V
V
V
V
REFH2  
1
2
3
4
5
20  
19  
18  
17  
16  
15  
18  
17  
16  
15  
REFH3  
V
+
–
V
V
V
REFH2  
1
2
3
4
5
20  
19  
18  
17  
16  
15  
14  
13  
12  
11  
REFH3  
V
OUT1  
PROGRAM  
CONTROL  
PROG  
V
REFH4  
REFH1  
V
REFH4  
REFH1  
WIPER  
CONTROL  
REGISTERS  
AND  
+
–
V
V
OUT1  
DD  
V
OUT2  
OUT1  
DD  
V
CLK  
4
6
NVRAM  
V
OUT2  
CLK  
CLK  
CS  
DI  
OUT2  
+
–
DATA  
CONTROLLER  
V
V
OUT3  
OUT3  
RDY/BSY  
CS  
RDY/BSY  
CS  
V
OUT3  
V
OUT4  
6
7
7
V
OUT4  
6
CAT525  
CAT525  
+
–
V
OUT4  
14  
13  
12  
11  
V
REFL4  
DI  
DO  
7
V
DI  
DO  
REFL4  
28kΩ  
(ea)  
8
9
V
REFL3  
8
V
REFL3  
H.V.  
CHARGE  
PUMP  
SERIAL  
DATA  
OUTPUT  
REGISTER  
8
PROG  
GND  
V
DO  
9
REFL2  
V
REFL1  
PROG  
GND  
V
REFL2  
V
REFL1  
10  
10  
11  
12  
V
13  
14  
V
CAT525  
REFL2  
REFL4  
V
V
REFL1  
REFL3  
© 2001 by Catalyst Semiconductor, Inc.  
Characteristics subject to change without notice  
Doc. No. 2001, Rev. A  
1
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