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DS32X35 Datasheet(PDF) 1 Page - Maxim Integrated Products |
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DS32X35 Datasheet(HTML) 1 Page - Maxim Integrated Products |
1 / 21 page General Description The DS32x35 accurate real-time clock (RTC) is a tem- perature-compensated clock/calendar that includes an integrated 32.768kHz crystal and a bank of nonvolatile memory in a single package. The nonvolatile memory is available in two densities: 2048 x 8 and 8192 x 8 bits. The integration of the crystal resonator enhances the long-term accuracy of the device as well as reduces the piece part count in a manufacturing line. The device operates as a slave device on an I2C serial interface, and is available in both commercial and industrial tem- perature ranges in a 300-mil, 20-pin SO package. The DS32x35 includes a bank of nonvolatile memory that does not require a backup energy source to main- tain memory contents. In addition, there are no read or write cycle limitations. The memory array can be accessed at maximum cycle rates for the life of the product with no wear-out mechanisms. Other device features include two time-of-day alarms, a selectable output that provides either an interrupt or pro- grammable square wave, and a calibrated 32.768kHz square-wave output. A reset input/output pin provides a power-on reset. Additionally, the reset pin is monitored as a pushbutton input for generating a reset externally. A precision temperature-compensated reference and comparator circuit monitors the status of VCC and auto- matically switches to the backup supply when neces- sary. The backup supply maintains operation of the TCXO, clock, alarms, and RTC I2C operation. Applications Servers Utility Power Meters Telematics GPS Features o Integrated 32.768kHz Crystal o Fast (400kHz) I2C Interface o RTC Counts Seconds, Minutes, Hours, Day, Date, Month, and Year with Leap Year Compensation Valid Up to 2100 o RTC Accuracy ±2ppm from 0°C to +40°C o RTC Accuracy ±3.5ppm from -40°C to 0°C and +40°C to +85°C o Nonvolatile Memory with 10 Years of Guaranteed Backup Time and Write Protection o Two Available Densities of Nonvolatile Memory 2048 Bytes (DS32B35) 8192 Bytes (DS32C35) o No Cycle Limitations on Memory o Power-Switching Circuit Selects Between Main Power and Battery Backup for the RTC o Programmable Square Wave with Frequency of 32.768kHz, 8.192kHz, 4.096kHz, or 1Hz o Two Time-of-Day Alarms o Reset Output/Pushbutton Reset (Debounced) Input o Programmable Output Provides Interrupt or Square Wave o Calibrated 32.768kHz Open-Drain Output o Temp Sensor with ±3°C Accuracy o 3.3V Operating Voltage o Commercial and Industrial Temperature Ranges o 300-mil, 20-Pin SO Package o Underwriters Laboratories (UL) Recognized Accurate I2C RTC with Integrated TCXO/Crystal/FRAM ______________________________________________ Maxim Integrated Products 1 Rev 0; 12/06 For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. Pin Configuration and Ordering Information appear at end of data sheet. DS32x35 VCC SCL RPU RPU = tR/CB RPU INT/SQW 32kHz VBAT PUSHBUTTON RESET SDA RST N.C. N.C. N.C. N.C. N.C. VCC VCC GND VCC CPU N.C. GND N.C. N.C. N.C. SCL WP Typical Operating Circuit |
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