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AD5171 Datasheet(PDF) 1 Page - Analog Devices

Part No. AD5171
Description  64-Position OTP Digital Potentiometer
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

AD5171 Datasheet(HTML) 1 Page - Analog Devices

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64-Position OTP Digital Potentiometer
AD5171
FEATURES
64 positions
OTP (one-time programmable)1 set-and-forget resistance
setting—low cost alternative over EEMEM
Unlimited adjustments prior to OTP activation
5 kΩ, 10 kΩ, 50 kΩ, 100 kΩ end-to-end resistance
Low tempco 5 ppm/oC in potentiometer mode
Rev. PrC
Low tempco 35 ppm/°C in rheostat mode
Compact standard SOT-23-8 package
Low power, IDD = 8 µA max
Fast settling time, ts = 5 µs typ in power-up
I2C compatible digital interface
Computer software replaces µc in factory programming
applications
Full read/write of wiper register
Extra I2C device address pin
Power-on preset to midscale
6 V one-time programming voltage
Low operating voltage, 2.7 V to 5.5 V
OTP validation check function
Automotive temperature range −40°C to +125°C
APPLICATIONS
Systems calibrations
Electronics level settings
Mechanical potentiometers and trimmers® replacements
Automotive electronics adjustments
Gain control and offset adjustments
Transducer circuits adjustments
Programmable filters up to 1.5 MHz BW
GENERAL DESCRIPTION
The AD5171 is a 64-position, one-time programmable (OTP)
digital potentiometer2, which employs fuse link technology to
achieve the memory retention of resistance setting function.
OTP is a cost-effective alternative over the EEMEM approach
for users who do not need to reprogram new memory setting in
the digital potentiometer. This device performs the same
electronic adjustment function like most mechanical trimmers
and variable resistors do. The AD5171 is programmed using a
2-wire I2C compatible digital control. It allows unlimited
adjustments before permanently setting the resistance value.
During the OTP activation, a permanent fuse blown command
is sent after the final value is determined; therefore freezing the
wiper position at a given setting (analogous to placing epoxy on
a mechanical trimmer). When this permanent setting is
achieved, the value will not change regardless of supply
variations or environmental stresses under normal operating
conditions. To verify the success of permanent programming,
Analog Devices patterned the OTP validation such that the fuse
status can be discerned from two validation bits in read mode.
For applications that program AD5171 in the factories, Analog
Devices offers a device programming software, which operates
across Windows® 95 to XP® platforms including Windows NT®.
This software application effectively replaces the need for
external I2C controllers or host processors and therefore
significantly reduces users’ development time.
An AD5171 evaluation kit is available, which includes the
software, connector, and cable that can be converted for the
factory programming applications.
The AD5171 is available in a compact SOT-23-8 package. All
parts are guaranteed to operate over the automotive
temperature range of −40°C to +125°C. Besides its unique OTP
feature, the AD5171 lends itself well to other general-purpose
digital potentiometer applications due to its temperature
performance, small form factor, and low cost.
GND
I2C INTERFACE
AND
CONTROL LOGIC
A
W
B
WIPER
REGISTER
FUSE
LINK
VDD
AD0
SDA
SCL
AD5171
Figure 1. Functional Block Diagram
TOP VIEW
(Not to Scale)
8
7
6
5
1
2
3
4
W
VDD
GND
SCL
A
B
AD0
SDA
AD5171
Figure 2. Pin Configuration
1One-time programmable (OTP) - Unlimited adjustments before permanent
setting.
2The terms digital potentiometer and RDAC are used interchangeably.
Information furnished by Analog Devices is believed to be accurate and reliable.
However, no responsibility is assumed by Analog Devices for its use, nor for any
infringements of patents or other rights of third parties that may result from its use.
Specifications subject to change without notice. No license is granted by implication
or otherwise under any patent or patent rights of Analog Devices. Trademarks and
registered trademarks are the property of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.326.8703
© 2003 Analog Devices, Inc. All rights reserved.
Preliminary Technical Data


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