DS1775 Digital Thermometer and Thermostat in SOT23 General Description Benefits and Features The DS1775 digital thermometer and thermostat Temperature Measurements Require No External provides temperature readings that indicate the devices Components temperature. Thermostat settings and temperature Measures Temperatures from -55C to +125C readings are all communicated to/from the DS1775 over (-67F to +257F) a simple 2-wire serial interface. No additional components 2.0C Thermometer Accuracy are required the device is truly a temperature-to-digital converter. Thermometer Resolution is Configurable from 9 Bits to 12 Bits (0.5C to 0.0625C Resolution) For applications that require greater temperature resolution, User-Definable Thermostat Settings the user can adjust the readout resolution from 9 to 12 bits. This is particularly useful in applications where Data is Read From/Written to Through a thermal runaway conditions must be detected quickly. 2-Wire Serial Interface The open-drain thermal alarm output, O.S., becomes 2.7V to 5.5V Wide Power-Supply Range active when the temperature of the device exceeds a Software Compatible with DS75 2-Wire Thermal user-defined temperature T . The number of consecutive OS Watchdog in Thermometer Mode faults required to set O.S. active is configurable by the user. The device can also be configured in the interrupt or Space-Conscious 5-Pin SOT23 Package with Low comparator mode, to customize the method which clears Thermal Time Constant the fault condition. As a digital thermometer, the DS1775 is software compatible Ordering Information appears at end of data sheet. with the DS75 2-wire thermal watchdog. The DS1775 is assembled in a compact 5-pin SOT23 package, allowing for low-cost thermal monitoring/control in space- constrained applications. The low thermal mass allows for time constants previously only possible with thermistors. Applications Personal Computers/Servers/Workstations Cell Phones Office Equipment Any Thermally-Sensitive System 19-6687 Rev 1 11/16DS1775 Digital Thermometer and Thermostat in SOT23 Absolute Maximum Ratings (Voltages relative to ground.) Storage Temperature Range ............................ -55C to +125C Voltage Range on V .........................................-0.3V to +7.0V Lead Temperature (soldering, 10s) .................................+300C DD Voltage Range on Any Other Pin .........................-0.3V to +7.0V 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 (2.7V V 5.5V, T = -55C to +125C, unless otherwise noted.) DD A PARAMETER SYMBOL CONDITION MIN TYP MAX UNITS Supply Voltage V (Note 1) 2.7 5.5 V DD 0.7 x V + DD Input Logic-High V (Note 1) V IH V 0.5 DD 0.3 x Input Logic-Low V (Note 1) -0.5 V IL V DD V 3mA sink current (Note 1) 0 0.4 OL1 SDA Output Logic-Low Voltage V V 6mA sink current (Note 1) 0 0.6 OL2 O.S. Saturation Voltage V 4mA sink current (Notes 1, 9) 0.8 V OL Input Current Each I/O Pin 0.4 < V < 0.9 x V (Note 2) -10 +10 A I/O DD I/O Capacitance C 10 pF I/O Standby Current I (Notes 3, 4) 1 A DD1 Active temp conversions (Notes 3, 4) 1000 Active Current I A DD Communication only (Notes 3, 4) 100 DIGITAL THERMOMETER -10C to +85C (Notes 9, 10) 0.5 2.0 Thermometer Error T C ERR -55C to +125C (Notes 9, 10) 1.0 3.0 Resolution 9 12 Bits 9-bit conversion 125 187.5 10-bit conversion 250 375 Conversion Time t ms CONVT 11-bit conversion 500 750 12-bit conversion 1000 1500 Maxim Integrated 2 www.maximintegrated.com