DS1845

Dual NV Potentiometer and Memory


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Description

The DS1845 Dual NV Potentiometer and 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 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. Access to this EEPROM is via an industry standard 2-wire bus. The wiper position of the DS1845, as well as EEPROM data, can be hardware write-protected using the Write Protect (WP) input pin. Up to eight DS1845s can be installed on a single 2-wire bus. Access to an individual device is achieved by using a device address that is determined by the logic levels of address pins A0 though A2. Additionally, the DS1845 will operate from 3 volt or 5 volt supplies. Three package options are available: Flip Chip Package, 16-ball CSBGA and 14-pin TSSOP.
DS1845: Pin Assignment DS1845: Pin Assignment Enlarge+

Key Features

  • Two linear taper potentiometers
    • DS1845-010 one 10k, 100 position & one 10k, 256 position
    • DS1845-050 one 10k, 100 position & one 50k, 256 postition
    • DS1845-100 one 10k, 100 position & one 100k, 256 position
  • 256 bytes of EEPROM memory
  • Access to data and potentiometer control via an I2C compatible 2-wire interface
  • External Write Enable pin to protect data and potentiometer settings
  • Nonvolatile wiper storage
  • Operates from 3V or 5V supplies
  • Packaging: Flip Chip Package, 16-ball CSBGA, 14-pin TSSOP
  • Industrial operating temperature: -40°C to +85°C
Part NumberTaperPOTsControl InterfaceWiper MemoryStepsREND-TO-END
(kΩ)
Res. Tol.
(%)
Temp. Coeff.
(ppm/°C)
Wiper Resistance
(Ω)
ICC @5V
(µA)
Package/PinsBudgetary
Price
typtypmaxSee Notes
DS1845 Linear22-Wire AddressableNon-Volatile100+256
10+10
10+100
10+50
2075025040
CSBGA/16
FCHIP/14
TSSOP/14
$1.87 @1k
See All Digital Potentiometers (120)
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 and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C  

Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

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