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DS1856E-030 Datasheet(PDF) 1 Page - Maxim Integrated Products |
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DS1856E-030 Datasheet(HTML) 1 Page - Maxim Integrated Products |
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1 / 31 page  Dual, Temperature-Controlled Resistors with Inter- nally Calibrated Monitors and Password Protection ______________________________________________ Maxim Integrated Products 1 For pricing delivery, and ordering information please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. General 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. Applications Optical Transceivers Optical Transponders Instrumentation and Industrial Controls RF Power Amps Diagnostic Monitoring 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 Ordering Information Rev 1; 4/05 PART RES0/RES1 RESISTANCE (k Ω) PIN-PACKAGE DS1856E-050 50/50 16 TSSOP DS1856E-050/T&R 50/50 16 TSSOP DS1856B-050 50/50 16-Ball CSBGA A TOP VIEW B C D 1 CSBGA (4mm x 4mm) 1.0mm PITCH 3 24 MON3 OUT1 IN2 MON1 L0 GND N.C. L1 H0 SDA OUT2 H1 VCC SCL IN1 MON2 16 15 14 13 12 11 10 9 1 2 3 4 5 6 7 8 SDA VCC H1 L1 H0 L0 MON3 MON2 MON1 TSSOP SCL OUT1 IN2 IN1 OUT2 N.C. GND DS1856 Pin Configurations DS1856 SDA 1 2 3 4 5 6 7 8 16 0.1 µF 15 14 13 12 11 10 9 SCL OUT1 IN1 OUT2 IN2 N.C. GND VCC H1 L1 H0 L0 MON3 MON2 MON1 Rx POWER* DIAGNOSTIC INPUTS TO LASER MODULATION CONTROL TO LASER BIAS CONTROL DECOUPLING CAPACITOR Tx POWER* Tx BIAS* *SATISFIES SFF-8472 COMPATIBILITY VCC VCC = 3.3V 4.7k Ω 4.7k Ω Tx-FAULT LOS 2-WIRE INTERFACE Typical Operating Circuit Ordering Information continued at end of data sheet. +Denotes lead free. *Future product—contact factory for availability. T&R denotes tape-and-reel. All parts operate at the -40°C to +95°C temperature range. |
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