DS1629

DS1629 2-Wire Digital Thermometer and Real-Time Clock FEATURES  Measures Temperatures from -55°C to +125°C; Fahrenheit Equivalent is -67°F to 257°F  Real-Time Clock Counts Seconds, Minutes, Hours, Date of the Month, Month, Day of the Week, and Year with Leap Year Compensation Through the Year 2100  Thermometer Accuracy is ±2.0°C (typ)  Thermometer Resolution is 9 Bits (Expandable)  Thermostatic and Time Alarm Settings Are User Definable; Dedicated Open-Drain Alarm Output  32 Bytes SRAM for General Data Storage  Data is Read From/Written to via a 2-Wire Serial Interface (Open Drain I/O Lines)  Wide Power Supply Range (2.2V to 5.5V)  Applications Include PCs/PDAs, Cellular Telephones, Office Equipment, Data Loggers, or Any Thermally Sensitive System  8-Pin (150-mil) SO Package PIN CONFIGURATION SDA SCL ALRM GND 1 8 VDD 2 7 OSC 3 6 X1 4 5 X2 SO (150 mils) PIN DESCRIPTION SDA - 2-Wire Serial Data Input/Output SCL - 2-Wire Serial Clock GND - Ground ALRM - Thermostat and Clock Alarm Output X1 - 32.768kHz Crystal Input X2 - 32.768kHz Crystal Feedback Output OSC - Buffered Oscillator Output VDD - Power-Supply Voltage (+2.2V to +5V) DESCRIPTION The DS1629 2-wire digital thermometer and real-time clock (RTC) integrates the critical functions of a real-time clock and a temperature monitor in a small outline 8-pin SO package. Communication to the DS1629 is accomplished via a 2-wire interface. The wide power-supply range and minimal power requirement of the ...