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DS1855
Dual Nonvolatile Digital Potentiometer and Secure Memory
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Status
Description
The DS1855 Dual Nonvolatile (NV) Digital Potentiometer and Secure Memory consists of one 100-position linear taper potentiometer, one 256-position linear taper potentiometer, 256 bytes of EEPROM memory, and a 2-wire interface. The DS1855, which features a new software write protect, is an upgrade from the DS1845. This device provides an ideal method for setting bias voltages and currents in control applications using a minimum of circuitry. The EEPROM memory allows a user to store configuration or calibration data for a specific system or device as well as provide control of the potentiometer wiper settings. Any type of user information may reside in the first 248 bytes of this memory. The next two addresses of EEPROM memory are for potentiometer settings and the remaining 6 bytes of memory are reserved. These reserved and potentiometer registers should not be used for data storage. Access to this EEPROM is via an industry-standard 2-wire bus. The interface I/O pins consist of SDA and SCL. The wiper position of the DS1855, as well as EEPROM data, can be write-protected through hardware using the write-protect input pin (WP) or software using the 2-wire interface.
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Data Sheet
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Key Features
- Two linear taper potentiometers
- DS1855-010 (one 10k, 100 position and one 10k, 256 position)
- DS1855-020 (one 10k, 100 position and one 20k, 256 position)
- DS1855-050 (one 10k, 100 position and one 50k, 256 position)
- DS1855-100 (one 10k, 100 position and one 100k, 256 position)
- 256 bytes of EEPROM memory
- Access to data and potentiometer control via a 2-wire interface
- External write-protect pin to protect data and potentiometer settings
- Data and potentiometer settings also can be write-protected through software control
- Nonvolatile wiper storage
- Operates from 3V or 5V supplies
- Packaging: 14-pin TSSOP, 16-ball CSBGA, flip-chip package
- Industrial operating temperature: -40ºC to +85ºC
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Applications/Uses
- Automated Test Equipment (ATE)
- Cell Phones
- Consumer Audio
- Cordless Phones
- Digital Still Cameras
- Digital Television (Receivers, Set-Top Boxes)
- Industrial Sensor Transmitters/Transducers
- Industrial Sensor Transmitters/Transducers
- LCD Displays and Panels
- Notebook Computers
- Palmtops, Handy Terminals (incl. barcode)
- Portable Patient Monitoring/Drug Delivery
- Test and Measurement Equipment
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Key Specifications:
| Digital Potentiometers |
| Part Number |
Taper |
POTs |
Control Interface |
Wiper Memory |
Steps |
REND-TO-END
(kΩ) |
Res. Tol.
(%) |
Temp. Coeff.
(ppm/°C) |
Wiper Resistance
(Ω) |
ICC @5V
(µA) |
Smallest Available Pckg.
(mm2) |
Budgetary Price |
| typ |
typ |
max |
max w/pins |
See Notes |
| DS1855 |
Linear |
2 |
2-Wire Addressable |
Non-Volatile |
100+256 |
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20 |
750 |
250 |
60 |
5.2 |
$1.68 @1k |
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See All Digital Potentiometers (126)
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Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific prices and delivery, please see the price and availability page or contact an authorized distributor.
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Diagram
Block Diagram
More Information
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Information Index
Rev 1;
2001-10-05
This page last modified: 2009-10-15
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