DS75 DS75 LX LX DS75LX Digital Thermometer and Thermostat with Extended Addressing www.maxim-ic.com GENERAL DESCRIPTION FEATURES This low-voltage (1.7V to 3.7V) digital thermometer 1.7V to 3.7V Operating Range and thermostat provides 9, 10, 11, or 12-bit digital Tri-State Address Pins Allow Up to 27 Unique temperature readings over a -55C to +125C range Bus Addresses Temperature Measurements Require No with 2C accuracy over a -25C to +100C range. At power-up, the DS75LX defaults to 9-bit resolution for External Components Measures Temperatures from -55C to +125C software compatibility with the LM75. Communication with the DS75LX is achieved through a simple 2-wire (-67F to +257F) serial interface. Three tri-state address pins allow up 2C Accuracy from -25C to +100C to 27 DS75LX devices to operate on the same 2-wire Thermometer Resolution Is User- bus, which greatly simplifies distributed temperature- Configurable from 9 (Default) to 12 Bits (0.5C sensing applications. to 0.0625C Resolution) 9-Bit Conversion Time is 25ms (max) The DS75LX thermostat has a dedicated open-drain Thermostatic Settings are User-Definable output (O.S.) and programmable fault tolerance, Data is Read/Written Through 2-Wire Serial which allow the user to define the number of Interface (SDA and SCL Pins) consecutive error conditions that must occur before Data Lines Filtered Internally for Noise O.S. is activated. There are two thermostatic Immunity (50ns Deglitch) operating modes that control thermostat operation Bus Timeout Feature Prevents Lockup based on user-defined trip-points (T and T ). OS HYST Problems on 2-Wire Interface Multidrop Capability Simplifies Distributed Temperature-Sensing Applications APPLICATIONS Pin/Software Compatible with the LM75 Any Thermally Sensitive System Available in 8-Pin SOP ( MAX ) and SO Cellular Base Stations Packages Telecom Switches and Routers Servers PIN CONFIGURATIONS ORDERING INFORMATION PIN PART TEMP RANGE PACKAGE 8 SDA 1 V DD 8 SO DS75LXS+ -55C to +125C (150 mils) A SCL 2 7 8 SO 0 DS75LXS+T&R -55C to +125C (150 mils), O.S. A 2500 Piece 3 6 1 8 SOP DS75LXU+ -55C to +125C GND 4 5 A 2 (MAX) 8 SOP SO (150 mils) DS75LXU+T&R -55C to +125C (MAX), 3000 Piece + Denotes lead-free package. 8 SDA 1 V T&R denotes tape-and-reel. DD 2 7 SCL A 0 Note: A + symbol will also be marked on the package near the 3 6 pin 1 indicator. O.S. A 1 4 5 GND A 2 MAX is a registered trademark of Maxim Integrated Products, Inc. SOP/ MAX 1 of 13 050307 DS1386/DS1386P ABSOLUTE MAXIMUM RATINGS Voltage Range on V , Relative to Ground -0.3V to +4.0V DD Voltage Range on Any Other Pin, Relative to Ground -0.3V to +6.0V Operating Temperature Range -55C to +125C Storage Temperature Range -55C to +125C Soldering Temperature See IPC/JEDEC J-STD-020 These are stress ratings only and functional operation of the device at these or any other conditions above those indicated in the operation sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods of time may affect reliability. The Dallas Semiconductor DS75LX is built to the highest quality standards and manufactured for long-term reliability. All Dallas Semiconductor devices are made using the same quality materials and manufacturing methods. However, the DS75LX is not exposed to environmental stresses, such as burn-in, that some industrial applications require. For specific reliability information on this product, contact the factory in Dallas at (972) 371- 4448. DC ELECTRICAL CHARACTERISTICS (1.7V V 3.7V, T = -55C to +125C.) DD A PARAMETER SYMBOL CONDITIONS MIN MAX UNITS Supply Voltage V (Note 1) 1.7 3.7 V DD -25C to +100C Thermometer Error 2.0 T C ERR (Note 2) -55C to +125C 3.0 Input Logic-High SDA, V (Note 3) 0.7 x V V + 0.3 V IH DD DD SCL Input Logic-Low SDA, V V - 0.3 0.3 x V V IL SS DD SCL V 3mA sink current 0 0.4 OL1 SDA Output Logic-Low V Voltage (Note 3) V 6mA sink current 0 0.6 OL2 4mA sink current O.S. Saturation Voltage V 0.8 V OL (Notes 2, 3) Input Current SDA, SCL 0.4 < V < 0.9V -10 +10 A I/O DD I/O Capacitance C 10 pF I/O Address Input Sink A0, A1, or A2 tied to V DD I 0.2 3.5 A LAH Current (Notes 4, 5) Address Input Source A0, A1, or A2 tied to GND I 0.2 3.5 A LAL Current (Notes 4, 5) Address Voltage High V (Note 6) V - .04 V AH DD Address Voltage Low V (Note 6) V + .04 V AL SS Standby Current I (Notes 4, 5) 13 A DD1 Active Current Active temp conversions 1000 I A DD (Notes 1, 4, 5) Communication only 100 AC ELECTRICAL CHARACTERISTICS (1.7V V 3.7V, T = -55C to +125C.) DD A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Resolution 9 12 Bits 9-bit conversions 25 10-bit conversions 50 Temperature Conversion t ms CONVT Time 11-bit conversions 100 12-bit conversions 200 2 of 13