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CAT521 Folha de dados(PDF) 1 Page - Catalyst Semiconductor

Nome de Peças. CAT521
descrição  Configured Digitally Programmable Potentiometer
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Fbricantes  CATALYST [Catalyst Semiconductor]
Página de início  http://www.catalyst-semiconductor.com
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CAT521 Folha de dados(HTML) 1 Page - Catalyst Semiconductor

 
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Doc. No. 2003, Rev. F
© 2004 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
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14
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8
10
9
VDD
CLK
RDY/BSY
CS
DI
DO
PROG
VREFH
NC
VOUT
NC
NC
VREFL
GND
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2
3
4
5
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14
13
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11
8
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9
VDD
CLK
RDY/BSY
CS
DI
DO
PROG
VREFH
NC
VOUT
NC
NC
VREFL
GND
CAT521
Configured Digitally Programmable Potentiometer (DPP™):
Programmable Voltage Applications
FEATURES
s 8-bit DPP configured as a programmable
voltage source in DAC-like applications
s Buffered wiper output
s Non-volatile NVRAM memory wiper storage
s Output voltage range includes both supply rails
s 1 LSB accuracy, high resolution
s Serial Microwire-like interface
s Single supply operation: 2.7V - 5.5V
s Setting read-back without effecting outputs
APPLICATIONS
s Automated product calibration
s Remote control adjustment of equipment
s Offset, gain and zero adjustments in
self-calibrating and adaptive control systems
s Tamper-proof calibrations
s DAC (with memory) substitute
DESCRIPTION
The CAT521 is a 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 programmable DPP has an output voltage range
which includes both supply rails. The wiper is buffered
by a rail to rail op amp. The wiper setting, stored in
non-volatile NVRAM memory, is not lost when the
device is powered down and is automatically reinstated
when power is returned. The wiper can be dithered to
test new output values without effecting the stored
FUNCTIONAL DIAGRAM
PIN CONFIGURATION
settings and stored settings can be read back without
disturbing the DPP’s output.
The CAT521 is controlled with a simple 3-wire, Microwire-
like 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 CAT521 Tri-Stated 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 CAT521 is available in 0
°C to 70°C commercial and
-40
°C to 85°C industrial operating temperature ranges.
Both 14-pin plastic DIP and surface mount packages
are available.
DIP Package (P, L)
SOIC Package (J, W)
CAT521
CAT521
CAT521
ALO
GEN FR
TM
LEAD FREE
RDY/BSY
PROG
PROGRAM
CONTROL
DI
CS
CLK
SERIAL
DATA
OUTPUT
REGISTER
GND
V
DD
14
7
5
2
4
12
OUT
V
6
DO
8
9
31
+
SERIAL
CONTROL
NVRAM
WIPER
CONTROL
REGISTER
AND
V
REFH
VREFL


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