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PDF AD5171 Data sheet ( Hoja de datos )
| Número de pieza | AD5171 | |
| Descripción | 64-Position OTP Digital Potentiometer | |
| Fabricantes | Analog Devices | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de AD5171 (archivo pdf) en la parte inferior de esta página. Total 24 Páginas | ||
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64-Position OTP Digital Potentiometer
AD5171
FEATURES
64 position
One-time programmable (OTP) 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 temperature coefficient: 5 ppm/°C in potentiometer mode
Low temperature coefficient: 35 ppm/°C in rheostat mode
Compact standard 8-lead SOT-23 package
Low power: IDD = 10 μA maximum
Fast settling time: tS = 5 μs typical in power-up
I2C-compatible digital interface
Computer software replaces microcontroller in factory
programming applications
Full read/write of wiper register
Extra I2C device address pin
Low operating voltage: 2.7 V to 5.5 V
OTP validation check function
Automotive temperature range: −40°C to +125°C
APPLICATIONS
System calibrations
Electronics level settings
Mechanical trimmers and potentiometer replacements
Automotive electronics adjustments
Gain control and offset adjustments
Transducer circuit adjustments
Programmable filters up to 1.5 MHz BW1
GENERAL DESCRIPTION
The AD5171 is a 64-position, one-time programmable (OTP)
digital potentiometer2 that uses fuse link technology to achieve
the memory retention of the resistance setting function. OTP is
a cost-effective alternative over the EEMEM approach for users
who do not need to reprogram new memory settings in the
digital potentiometer. This device performs the same electronic
adjustment function as most mechanical trimmers and variable
resistors. 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, freezing the wiper position at a given
setting (analogous to placing epoxy on a mechanical trimmer).
FUNCTIONAL BLOCK DIAGRAM
SCL
SDA
I2C INTERFACE
AND
CONTROL LOGIC
A
W
AD0 B
VDD
GND
FUSE
LINK
WIPER
REGISTER
AD5171
Figure 1.
W1
8A
VDD 2 AD5171 7 B
GND
3
TOP VIEW
(Not to Scale)
6
AD0
SCL 4
5 SDA
Figure 2. Pin Configuration
When this permanent setting is achieved, the value does not
change regardless of supply variations or environmental stresses
under normal operating conditions. To verify the success of
permanent programming, Analog Devices, Inc., patterned the
OTP validation such that the fuse status can be discerned from
two validation bits in read mode.
For applications that program the AD5171 in factories, Analog
Devices offers device programming software that 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 the development time of the users.
An AD5171 evaluation kit includes the software, connector, and
cable that can be converted for factory programming applications.
The AD5171 is available in a compact 8-lead SOT-23 package.
All parts are guaranteed to operate over the automotive temper-
ature 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.
1 Applies to 5 kΩ parts only.
2 The terms digital potentiometer and RDAC are used interchangeably.
Rev. D
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.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113 ©2004–2008 Analog Devices, Inc. All rights reserved.
1 page  
AD5171
TIMING CHARACTERISTICS: 5 kΩ, 10 kΩ, 50 kΩ, AND 100 kΩ
VDD = 3 V to 5 V ± 10%, VA = VDD, VB = 0 V, −40°C < TA < +125°C, unless otherwise noted.
Table 2.
Parameter
INTERFACE TIMING CHARACTERISTICS (APPLY TO ALL PARTS2, 3)
SCL Clock Frequency
tBUF Bus Free Time Between Start and Stop
tHD;STA Hold Time (Repeated Start)
tLOW Low Period of SCL Clock
tHIGH High Period of SCL Clock
tSU;STA Setup Time for Start Condition
tHD;DAT Data Hold Time
tSU;DAT Data Setup Time
tF Fall Time of Both SDA and SCL Signals
tR Rise Time of Both SDA and SCL Signals
tSU;STO Setup Time for Stop Condition
OTP Program Time
Symbol Conditions
fSCL
t1
t2 After this period, the
first clock pulse is generated
t3
t4
t5
t6
t7
t8
t9
t10
t11
1 Typical specifications represent average readings at 25°C and VDD = 5 V.
2 Guaranteed by design; not subject to production test.
3 All dynamic characteristics use VDD = 5 V.
Min Typ1 Max Unit
400 kHz
1.3 μs
0.6 μs
1.3 μs
0.6 50 μs
0.6 μs
0.9 μs
0.1 μs
0.3 μs
0.3 μs
0.6 μs
400 ms
t8 t9 t6
SCL
SDA
t2
t8
t3
t1
PS
t4
t9
t5
t7
Figure 3. Interface Timing Diagram
t10
P
Rev. D | Page 5 of 24
5 Page 
10
VA = VB = OPEN
TA = 25°C
1
0.1
RAB = 5kΩ
RAB = 10kΩ
RAB = 50kΩ
RAB = 100kΩ
0.01
0
8 16 24 32 40 48
CODE (DECIMAL)
Figure 23. Theoretical IWB_MAX vs. Code
56
64
AD5171
CH1 MAX
103mA
CH1 MIN
–1.98mA
1
CH1 20.0mAΩ
M 200ns
A CH1 32.4mA
T 588.000ns
Figure 24. OTP Program Energy Plot for Single Fuse
Rev. D | Page 11 of 24
11 Page | ||
| Páginas | Total 24 Páginas | |
| PDF Descargar | [ Datasheet AD5171.PDF ] | |
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