DS1858 Rev 1 5/06 Dual Temperature-Controlled Resistors with Three Monitors General Description Features The DS1858 dual temperature-controlled nonvolatile Five Total Monitored Channels (Temperature, (NV) variable resistors with three monitors consists of V , MON1, MON2, MON3) CC two 50k 256-position linear variable resistors, three Three External Analog Inputs (MON1, MON2, analog monitor inputs (MON1, MON2, MON3), and a direct-to-digital temperature sensor. The device pro- MON3) vides an ideal method for setting and temperature-com- Internal Direct-to-Digital Temperature Sensor pensating bias voltages and currents in control Two 50k , Linear, 256-Position, Nonvolatile applications using minimal circuitry. The variable resis- tor settings are stored in EEPROM memory and can be Temperature-Controlled Variable Resistors accessed over the 2-wire serial bus. Resistor Settings Changeable Every 2C Access to Monitoring and ID Information Configurable with Separate Device Addresses Applications 2-Wire Serial Interface Optical Transceivers Two Buffers with TTL/CMOS-Compatible Inputs Optical Transponders and Open-Drain Outputs Instrumentation and Industrial Controls Operates from a 3.3V or 5V Supply RF Power Amps SFF-8472 Compatible Diagnostic Monitoring Ordering Information Typical Operating Circuit PART TEMP RANGE PIN-PACKAGE DS1858E-050 -40C to +95C 16 TSSOP V CC DS1858E-050+ -40C to +95C 16 TSSOP V = 3.3V CC 16 TSSOP DS1858E-050/T&R -40C to +95C (Tape-and-Reel) 4.7k 4.7k DECOUPLING 0.1 F CAP 16 1 DS1858B-050 -40C to +95C 16-Ball CSBGA V CC SDA 2-WIRE 15 2 TO LASER BIAS H1 INTERFACE +Denotes lead-free package. SCL 14 CONTROL 3 L1 OUT1 TO LASER 13 Tx-FAULT 4 H0 Pin Configurations MODULATION IN1 12 L0 CONTROL 5 DS1858 OUT2 LOS 6 11 Tx POWER* TOP VIEW IN2 MON3 DIAGNOSTIC 10 7 Rx POWER* GROUND TO 1 SDA V CC 16 WPEN MON2 INPUTS A V IN1 SCL H1 DISABLE WRITE CC 8 9 Tx BIAS* 0 TO 2.5V FS 2 SCL H1 15 PROTECT GND MON1 3 OUT1 14 L1 B OUT2 SDA H0 L1 *Rx POWER, Tx BIAS, AND Tx POWER CAN BE 4 IN1 H0 13 ARBITRARILY ASSIGNED TO THE MON INPUTS DS1858 OUT2 12 5 L0 C WPEN IN2 OUT1 MON3 6 IN2 MON3 11 10 7 WPEN MON2 D GND L0 MON1 MON2 GND MON1 8 9 1243 16-BALL CSBGA (4mm x 4mm) 16 TSSOP 1.0mm PITCH Maxim Integrated Products 1 For pricing delivery, and ordering information please contact Maxim/Dallas Direct at 1-888-629-4642, or visit Maxims website at www.maxim-ic.com. EVALUATION KIT AVAILABLEDual Temperature-Controlled Resistors with Three Monitors ABSOLUTE MAXIMUM RATINGS Voltage on V Relative to Ground.......................-0.5V to +6.0V Current into Resistors............................................................5mA CC Voltage on Inputs Relative Operating Temperature Range ...........................-40C to +95C to Ground* ................................................-0.5V to V + 0.5V Programming Temperature Range .........................0C to +70C CC Voltage on Resistor Inputs Relative Storage Temperature Range .............................-55C to +125C to Ground* ................................................-0.5V to V + 0.5V Soldering Temperature .......................................See IPC/JEDEC CC *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 DC OPERATING CONDITIONS (T = -40C to +95C, unless otherwise noted.) A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Supply Voltage V (Note 1) 3.0 5.5 V CC Input Logic 1 (SDA, SCL, WPEN) V (Note 2) 0.7 x Vcc V + 0.3 V IH CC Input Logic 0 (SDA, SCL, WPEN) 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 V Input logic 1 1.5 IH Input Logic Levels (IN1, IN2) V V Input logic 0 0.9 IL DC ELECTRICAL CHARACTERISTICS (V = 3.0V to 5.5V, T = -40C to +95C, unless otherwise noted.) CC A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Supply Current I (Note 3) 1 2 mA CC Input Leakage I -1 +1 A IL Input Current each I/O Pin 0.4 x V < V < 0.9 x V -10 +10 A CC I/O CC V 3mA sink current 0 0.4 OL1 Low-Level Output Voltage (SDA) V V 6mA sink current 0 0.6 OL2 Full-Scale Input (MON1, MON2, (Note 4) 2.4875 2.5 2.5125 V MON3) Full-Scale V Monitor (Note 5) 6.5208 6.5536 6.5864 V CC I/O Capacitance C 10 pF I/O WPEN Pullup R 40 65 100 k WPEN V 3mA sink current 0 0.4 V OL1 OUT1, OUT2 Voltage V 6mA sink current 0 0.6 V OL2 Digital Power-On Reset POD 1.0 2.2 V Analog Power-On Reset POA 2.0 2.6 V 2 DS1858