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AD5170EVAL Datasheet

  • AD5170EVAL

  • 256-Position Two-Time Programmable I2C Digital Potentiometer

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256-Position Two-Time Programmable
I
2
C Digital Potentiometer
AD5170
FEATURES
256-position
TTP (two-time programmable) set-and-forget resistance
setting allows second-chance permanent programming
Unlimited adjustments prior to OTP (one-time
programming) activation
OTP overwrite allows dynamic adjustments with user
defined preset
End-to-end resistance: 2.5 k鈩? 10 k鈩? 50 k鈩? 100 k鈩?/div>
Compact MSOP-10 (3 mm 脳 4.9 mm) package
Fast settling time: t
S
= 5 碌s typ in power-up
Full read/write of wiper register
Power-on preset to midscale
Extra package address decode pins AD0 and AD1
Single-supply 2.7 V to 5.5 V
Low temperature coefficient: 35 ppm/擄C
Low power, I
DD
= 6 碌A(chǔ) maximum
Wide operating temperature: 鈥?0擄C to +125擄C
Evaluation board and software are available
Software replaces 碌C in factory programming applications
FUNCTIONAL BLOCK DIAGRAM
A
W
B
V
DD
1
GND
FUSE
LINKS
2
RDAC
REGISTER
AD0
AD1
SDA
SCL
ADDRESS
DECODE
/
8
SERIAL INPUT
REGISTER
04104-0-001
Figure 1.
APPLICATIONS
Systems calibration
Electronics level setting
Mechanical Trimmers廬 replacement in new designs
Permanent factory PCB setting
Transducer adjustment of pressure, temperature, position,
chemical, and optical sensors
RF amplifier biasing
Automotive electronics adjustment
Gain control and offset adjustment
The AD5170 is programmed using a 2-wire, I
2
C廬 compatible
digital interface. Unlimited adjustments are allowed before
permanently (there are actually two opportunities) setting the
resistance value. During OTP activation, a permanent blow fuse
command freezes the wiper position (analogous to placing
epoxy on a mechanical trimmer).
Unlike traditional OTP digital potentiometers, the AD5170 has
a unique temporary OTP overwrite feature that allows for new
adjustments even after the fuse has been blown. However, the
OTP setting is restored during subsequent power-up
conditions. This feature allows users to treat these digital
potentiometers as volatile potentiometers with a programmable
preset.
For applications that program the AD5170 at the factory,
Analog Devices offers device programming software running
on Windows NT廬, 2000, and XP廬 operating systems. This
software effectively replaces any external I
2
C controllers, thus
enhancing the time-to-market of the user鈥檚 systems.
1
GENERAL OVERVIEW
The AD5170 is a 256-position, two-time programmable (TTP)
digital potentiometer
1
that employs fuse link technology to
enable two opportunities at permanently programming the
resistance setting. OTP is a cost-effective alternative to EEMEM
for users who do not need to program the digital potentiometer
setting in memory more than once. This device performs the
same electronic adjustment function as mechanical
potentiometers or variable resistors with enhanced resolution,
solid-state reliability, and superior low temperature coefficient
performance.
The terms digital potentiometer, VR, and RDAC are used interchangeably.
Rev. A
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
漏 2004 Analog Devices, Inc. All rights reserved.

AD5170EVAL 產(chǎn)品屬性

  • 開(kāi)發(fā)套件

  • 帶軟件的 CD，用于 AD5170 數(shù)字電位計(jì)的評(píng)估套件

  • 數(shù)據(jù)采集

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