Click here to ask about the production status of specific part numbers. MAX31826 1-Wire Digital Temperature Sensor with 1Kb Lockable EEPROM General Description Benefits and Features The MAX31826 digital thermometer provides 12-bit Unique 1-Wire Interface Requires Only One Port Pin for Communication temperature measurements and communicates over a 1-Wire bus that by definition requires only one data line Integrated Temperature Sensor and EEPROM (and ground) for communication with a central microcon- Reduce Component Count troller. It has a -55C to +125C operating temperature Measures Temperatures from -55C to +125C range and is accurate to 0.5C over the -10C to +85C (-67F to +257F) range. In addition, the device can derive power directly 0.5C Accuracy from -10C to +85C from the data line (parasite power), eliminating the need 12-Bit Temperature Resolution (0.0625C) for an external power supply. 1Kb EEPROM Can Be Locked to Prevent Further Each device has a unique 64-bit serial code, which Writes allows multiple devices to function on the same 1-Wire Multidrop Capability Simplifies Multisensor Systems bus. Therefore, it is simple to use one microcontroller Each Device Has a Unique 64-Bit Serial Code (the master device) to control many devices distributed Stored in On-Board ROM over a large area. The device includes 128 bytes (1Kb) Four Pin-Programmable Bits to Uniquely of EEPROM for storage of system data. The EEPROM Identify Up to 16 Sensor Locations on a Bus can be locked to permanently prevent any further data Can Be Powered from Data Line (3.0V to 3.7V writes. Four location address inputs simplify mapping of Power-Supply Range) individual devices to specific locations. 8-Pin MAX and TDFN Packages Applications Industrial Systems System Calibration Ordering Information appears at end of data sheet. Building Automation Module Identification Consumer Equipment Block Diagram V PU 4.7k MEMORY CONTROL LOGIC DQ PARASITE- POWER MAX31826 CIRCUIT 64-BIT ROM GND AND 1Kb SCRATCHPAD 2 1-Wire PORT EEPROM C PP 16-BIT TEMPERATURE REGISTER POWER- V SUPPLY DD SCRATCHPAD 1 8-BIT CRC GENERATOR SENSE 8-BIT CONFIGURATION REGISTER ADDRESS PIN INPUT LATCH AD0 AD1 AD2 AD3 1-Wire and MAX are registered trademarks of Maxim Integrated Products, Inc. 19-6264 Rev 1 1/21MAX31826 1-Wire Digital Temperature Sensor with 1Kb Lockable EEPROM Absolute Maximum Ratings Voltage Range on Any Pin Relative to Ground ....-0.5V to +4.5V Storage Temperature Range ............................ -55C to +125C Continuous Power Dissipation (T = +70C) Lead Temperature (soldering, 10s) .................................+300C A MAX (derate 4.5mW/C above +70C) .....................362mW Soldering Temperature (reflow) .......................................+260C Operating Temperature Range ......................... -55C to +125C 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. DC Electrical Characteristics (T = -55C to +125C, unless otherwise noted.) (Note 1) A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Supply Voltage V Local power (Note 2) +3.0 +3.7 V DD Parasite power +3.0 +3.7 Pullup Supply Voltage V V PU (Notes 2, 3) Local power +3.0 V DD -10C to +85C -0.5 0.25 +0.5 Thermometer Error (Note 4) T C ERR -55C to +125C -2 +2 Input Logic-Low V (Notes 2, 5) -0.3 +0.8 V IL lower of 3.7V Local power +2.4 or (V + DD 0.3V) Input Logic-High (Notes 2, 6) V V IH lower of 3.7V Parasite power +3.0 or (V + DD 0.3V) Sink Current I V = 0.4V (Note 2) 4.0 mA L I/O Standby Current I (Notes 7, 8) 350 1000 nA DDS Active Current I V = 3.7V (Note 9) 650 1200 A DD DD Active Current with 800 1500 A Communication POR Time t Local or parasite power 4 7.8 ms POR Input Leakage Current -1 +1 A (AD0AD3 Pins) DQ Input Current I (Note 10) 5 A DQ Maxim Integrated 2 www.maximintegrated.com