DS1856

Dual, Temperature-Controlled Resistors with Internally Calibrated Monitors and Password Protection


Please check latest availability status for a specific part variant.

Description

The DS1856 dual, temperature-controlled, nonvolatile (NV) variable resistors with three monitors consists of two 256-position, linear, variable resistors; three analog monitor inputs (MON1, MON2, MON3); and a direct-to-digital temperature sensor. The device provides an ideal method for setting and temperature-compensating bias voltages and currents in control applications using minimal circuitry. The variable resistor settings are stored in EEPROM memory and can be accessed over the 2-wire serial bus.

Relative to other members of the family, the DS1856 is essentially a DS1859 with a DS1852-friendly memory map. In particular, the DS1856 can be configured so the 128 bytes of internal Auxiliary EEPROM memory is mapped into Main Device Table 00h and Table 01h, maintaining compatibility between both the DS1858/DS1859 and the DS1852. The DS1856 also features password protection equivalent to the DS1852, further enhancing compatibility between the two.
DS1856: Typical Operating Circuit DS1856: Typical Operating Circuit Enlarge+

Key Features

  • SFF-8472 Compatible
  • Five Monitored Channels (Temperature, VCC, MON1, MON2, MON3)
  • Three External Analog Inputs (MON1, MON2, MON3) That Support Internal and External Calibration
  • Scalable Dynamic Range for External Analog Inputs
  • Internal Direct-to-Digital Temperature Sensor
  • Alarm and Warning Flags for All Monitored Channels
  • Two Linear, 256-Position, Nonvolatile Temperature-Controlled Variable Resistors
  • Resistor Settings Changeable Every 2°C
  • Three Levels of Security
  • Access to Monitoring and ID Information Configurable with Separate Device Addresses
  • 2-Wire Serial Interface
  • Two Buffers with TTL/CMOS-Compatible Inputs and Open-Drain Outputs
  • Operates from a 3.3V or 5V Supply
  • -40°C to +95°C Operating Temperature Range

Applications/Uses

  • Diagnostic Monitoring
  • Instrumentation and Industrial Controls
  • Optical Transceivers
  • Optical Transponders
  • RF Power Amps

See parametric specs for Fiber Monitoring and Control (19)


Part NumberADCsResolution
(bits)
DACs/ ResistorsFS Out
(kΩ)
StepsTemp. SensorMemoryVSUPPLY
(V)
Control InterfacePackage/PinsBudgetary
Price
See Notes
DS1856 5-Input Muxable122 Resistors
20kohms
50kohms
256InternalEEPROM
3.3
5
I2C
CSBGA/16
TSSOP/16
$2.97 @1k

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.

DS1854EVKIT: Evaluation Kit for the DS1854, DS1857, DS1858, and DS1859 Fiber Optic Monitor and Control Evaluation Kit
DS1857EVKIT: Evaluation Kit for the DS1854, DS1857, DS1858, and DS1859 Fiber Optic Monitor and Control Evaluation Kit
DS1858EVKIT: Evaluation Kit for the DS1854, DS1857, DS1858, and DS1859 Fiber Optic Monitor and Control Evaluation Kit
DS1859EVKIT: Evaluation Kit for the DS1854, DS1857, DS1858, and DS1859 Fiber Optic Monitor and Control Evaluation Kit
DS185XEVKIT: Evaluation Kit for the DS1854, DS1857, DS1858, and DS1859 Fiber Optic Monitor and Control Evaluation Kit
Product Reliability Reports: DS1856.pdf 
Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C   Material Composition  

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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Related Resources

Type ID Title
Evaluation Board4798DS1854EVKIT Evaluation Kit for the DS1854, DS1857, DS1858, and DS1859 Fiber Optic Monitor and Control Evaluation Kit
Evaluation Board4798DS1858EVKIT Evaluation Kit for the DS1854, DS1857, DS1858, and DS1859 Fiber Optic Monitor and Control Evaluation Kit
Evaluation Board4798DS1857EVKIT Evaluation Kit for the DS1854, DS1857, DS1858, and DS1859 Fiber Optic Monitor and Control Evaluation Kit
Evaluation Board4798DS185XEVKIT Evaluation Kit for the DS1854, DS1857, DS1858, and DS1859 Fiber Optic Monitor and Control Evaluation Kit
Evaluation Board4798DS1859EVKIT Evaluation Kit for the DS1854, DS1857, DS1858, and DS1859 Fiber Optic Monitor and Control Evaluation Kit