DS1631Z+ Analog Devices

DS1631/DS1631A/ High-Precision Digital DS1731 Thermometer and Thermostat General Description Benefits and Features The DS1631, DS1631A, and DS1731 digital thermome- Maximize System Accuracy in Broad Range of ters provide 9, 10, 11, or 12-bit temperature readings over Thermal Management Applications a -55C to +125C range. The DS1631 and DS1631A Operating Temperature Range: -55C to +125C thermometer accuracy is 0.5C from 0C to +70C with (-67F to +257F) 3.0V V 5.5V, and the DS1731 accuracy is 1C DS1631 and DS1631A: 0.5C Accuracy over 0C DD to +70C Range from -10C to +85C with 3.0V V 5.5V. The ther- DD mostat on all three devices provides custom hysteresis DS1731: 1C Accuracy over a -10C to +85C Range User-Selectable Output Resolution from 9 Bits to with user-defined trip points (T and T ). The T and H L H T registers and thermometer configuration settings are 12 Bits L stored in NV EEPROM so they can be programmed prior Reduce Cost with No External Components to installation. In addition, the DS1631A automatically Simplify Distributed Temperature-Sensing Applications begins taking temperature measurements at power-up, with Multidrop Capability which allows it to function as a stand-alone thermostat. Up to Eight Devices Can Operate on a 2-Wire Bus Pin descriptions for the DS1631/DS1631A/DS1731 are pro- Flexible and Nonvolatile User-Defined Thermostatic vided in Table 2 and user-accessible registers are summa- Modes with Custom Hysteresis rized in Table 3. A functional diagram is shown in Figure 1. Available in 8-Pin SOP and SO (DS1631 and Applications DS1631A Only) and the 8-Pin DIP (DS1631 Only) Network Routers and Switches Packages Cellular Base Stations Portable Products Any Space-Constrained Thermally Sensitive Product Pin Configurations TOP VIEW + SDA 1 8 VDD DS1631 SCL 2 7 A0 Ordering Information appears at end of data sheet. T 3 6 A OUT 1 4 5 GND A 2 SOP See Table 2 for Pin Descriptions. (DS1631U+, DS1631AU+, DS1731U+) + SDA 1 8 VDD DS1631 SCL 2 7 A0 3 6 T A OUT 1 GND 4 5 A2 SO (150mil and 208mil) (DS1631Z+, DS1631S+) 19-7488 Rev 1 1/15DS1631/DS1631A/ High-Precision Digital DS1731 Thermometer and Thermostat Absolute Maximum Ratings Voltage on any Pin Relative to Ground ................-0.5V to +6.0V Solder Dip Temperature (10s) .......See IPC/JEDEC J-STD-020A Operating Temperature Range ......................... -55C to +125C Specification Storage Temperature Range ............................ -55C to +125C Reflow Oven Temperature ...............................................+220C *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. DC Electrical Characteristics (V = 2.7V to 5.5V T = -55C to +125C.) DD A PARAMETER SYMBOL CONDITION MIN MAX UNITS Supply Voltage V (Note 1) 2.7 5.5 V DD 0C to +70C, 0.5 3.0V V 5.5V DD DS1631, DS1631A T C 0C to +70C, ERR Thermometer Error (Note 2) 1 2.7V V < 3.0V DD -55C to +125C 2 -10C to +85C, 1 3.0V V 5.5V DD DS1731 Thermometer Error T C -10C to +85C, ERR (Note 2) 1.5 2.7V V < 3.0V DD -55C to +125C 2 Low-Level Input Voltage V -0.5 0.3 x V V IL DD High-Level Input Voltage V 0.7 x V V + 0.3 V IH DD DD V 3mA sink current 0 0.4 SDA Low-Level Output OL1 V Voltage V 6mA sink current 0 0.6 OL2 Input Current Each I/O Pin 0.4 < V < 0.9V -10 +10 A I/O DD Temperature conversion 1 -55C to +85C mA Temperature conversion 1.25 Active Supply Current (Note 3) I DD +85C to +125C 2 E write 400 A Communication only 110 Standby Supply Current I 0C to +70C (Note 4) 800 nA STBY V 1mA source current (Note 1) 2.4 V OH T Output Logic Voltage OUT V 4mA sink current (Note 1) 0.4 V OL Maxim Integrated 2 www.maximintegrated.com