EVALUATION KIT AVAILABLE DS1856M Dual, Temperature-Controlled Resistors with Calibrated Monitors and Password Protection General Description Features The DS1856M dual, temperature-controlled, nonvolatile SFF-8472 Compatible (NV) variable resistors with three monitors consists of 13-Bit ADC two 256-position, linear, variable resistors three analog monitor inputs (MON1, MON2, MON3) and a direct-to- Two Linear, 256-Position, Nonvolatile digital temperature sensor. The device provides an Temperature-Controlled Variable Resistors with ideal method for setting and temperature-compensating 2C Resolution bias voltages and currents in control applications using Three Levels of Security minimal circuitry. The variable resistor settings are stored in EEPROM memory and can be accessed over Access to Monitoring and ID Information the 2-wire serial bus. Configurable with Separate Device Addresses The DS1856M includes 128 bytes of EEPROM memory 2-Wire Serial Interface at A2h slave address, Table 00/01. The DS1856M also includes three-levels of password protection. The Two Buffers with TTL/CMOS-Compatible Inputs DS1856-01 includes 256 bytes of A0h EEPROM memo- and Open-Drain Outputs ry. The DS1856B-M50+ and DS1856E-M50+ are drop- Operates from a 3.3V or 5V Supply in replacements for the DS1856B-050+ and DS1866E-050+, respectively. The enhancements -40C to +95C Operating Temperature Range include 256 bytes of EEPROM at A0h selectable MON2, MON3 references and a 13-bit ADC. These are Typical Operating Circuit backward compatible by default with the DS1856B-050+/DS1856E-050+. V CC Applications V = 3.3V CC Optical Transceivers 4.7k 4.7k DECOUPLING 0.1F Optical Transponders CAPACITOR 16 1 V CC SDA Instrumentation and Industrial Controls 2-WIRE 15 2 TO LASER BIAS H1 INTERFACE SCL RF Power Amps 14 CONTROL 3 L1 OUT1 Diagnostic Monitoring TO LASER 13 Tx-FAULT 4 H0 MODULATION IN1 12 DS1856M CONTROL L0 5 OUT2 LOS 6 11 Rx POWER* IN2 MON3 Ordering Information appears at end of data sheet. 10 7 Tx POWER* DIAGNOSTIC N.C. MON2 INPUTS 8 9 Tx BIAS* GND MON1 *SATISFIES SFF-8472 COMPATIBILITY For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim Integrateds website at www.maximintegrated.com. 19-6395 Rev 1 6/13DS1856M Dual, Temperature-Controlled Resistors with Calibrated Monitors and Password Protection ABSOLUTE MAXIMUM RATINGS (All voltages relative to ground.) Operating Temperature Range ...........................-40C to +95C Voltage Range on V ..........................................-0.5V to +6.0V Programming Temperature Range .........................0C to +70C CC Voltage Range on Inputs ..........................-0.5V to (V + 0.5V)* Storage Temperature Range .............................-55C to +125C CC Voltage Range on Resistor Inputs ............-0.5V to (V + 0.5V)* Lead Temperature (TSSOP only soldering, 10s) ............+300C CC Current into Resistors............................................................5mA Soldering Temperature (reflow) .......................................+260C Continuous Power Dissipation (T = +70C) A CSBGA (derate 16.1C/W above +70C) ..................887.1mW TSSOP (derate 11.1C/W above +70C) ...................888.9mW *Not to exceed 6.0V. Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. RECOMMENDED OPERATING CONDITIONS (T = -40C to +95C, unless otherwise noted.) A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Supply Voltage V (Note 1) 2.85 5.50 V CC Input Logic 1 (SDA, SCL) V (Note 2) 0.7 x V V + 0.3 V IH CC CC Input Logic 0 (SDA, SCL) V (Note 2) -0.3 +0.3 x V V IL CC Resistor Inputs (L0, L1, H0, H1) -0.3 V + 0.3 V CC Resistor Current I -3 +3 mA RES High-Impedance Resistor I 0.001 0.1 A ROFF Current Input logic 1 2 Input Logic Levels (IN1, IN2) V Input logic 0 0.8 DC ELECTRICAL CHARACTERISTICS (V = 2.85V to 5.5V, T = -40C to +95C, unless otherwise noted.) (Note 3) CC A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Supply Current I (Note 4) 1 2 mA CC Input Leakage I -200 +200 nA IL Low-Level Output Voltage V 3mA sink current 0 0.4 V OL1 (SDA, OUT1, OUT2) Full-Scale Input (MON1, MON2, At factory setting 2.4875 2.5 2.5125 V MON3) (Note 5) Full-Scale V Monitor At factory setting (Note 6) 6.5208 6.5536 6.5864 V CC I/O Capacitance C 10 pF I/O Digital Power-On Reset POD POD < POA (Note 7) 1.0 2.5 V Analog Power-On Reset POA 1.875 2.65 V 2 Maxim Integrated