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DS3234 Dataheets PDF



Part Number DS3234
Manufacturers Maxim Integrated Products
Logo Maxim Integrated Products
Description Extremely Accurate SPI Bus RTC
Datasheet DS3234 DatasheetDS3234 Datasheet (PDF)

www.DataSheet4U.com Rev 0; 2/06 Extremely Accurate SPI Bus RTC with Integrated Crystal and SRAM General Description The DS3234 is a low-cost, extremely accurate SPI™ bus real-time clock (RTC) with an integrated temperaturecompensated crystal oscillator (TCXO) and crystal. The DS3234 incorporates a precision, temperature-compensated voltage reference and comparator circuit to monitor VCC. When VCC drops below the power-fail voltage (VPF), the device asserts the RST output and also disables read .

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www.DataSheet4U.com Rev 0; 2/06 Extremely Accurate SPI Bus RTC with Integrated Crystal and SRAM General Description The DS3234 is a low-cost, extremely accurate SPI™ bus real-time clock (RTC) with an integrated temperaturecompensated crystal oscillator (TCXO) and crystal. The DS3234 incorporates a precision, temperature-compensated voltage reference and comparator circuit to monitor VCC. When VCC drops below the power-fail voltage (VPF), the device asserts the RST output and also disables read and write access to the part when VCC drops below both VPF and VBAT. The RST pin is monitored as a pushbutton input for generating a reset externally. The device switches to the backup supply input and maintains accurate timekeeping when main power to the device is interrupted. 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 DS3234 is available in commercial and industrial temperature ranges, and is offered in an industry-standard 300-mil, 20-pin SO package. The DS3234 also integrates 256 bytes of battery-backed SRAM. In the event of main power loss, the contents of the memory are maintained by the power source connected to the VBAT pin. The RTC maintains seconds, minutes, hours, day, date, month, and year information. The date at the end of the month is automatically adjusted for months with fewer than 31 days, including corrections for leap year. The clock operates in either the 24-hour or 12-hour format with AM/PM indicator. Two programmable time-of-day alarms and a programmable square-wave output are provided. Address and data are transferred serially by an SPI bidirectional bus. Features ♦ Accuracy ±2ppm from 0°C to +40°C ♦ Accuracy ±3.5ppm from -40°C to +85°C ♦ Battery Backup Input for Continuous Timekeeping ♦ Operating Temperature Ranges Commercial: 0°C to +70°C Industrial: -40°C to +85°C ♦ Low-Power Consumption ♦ Real-Time Clock Counts Seconds, Minutes, Hours, Day, Date, Month, and Year with Leap Year Compensation Valid Up to 2099 ♦ Two Time-of-Day Alarms ♦ Programmable Square-Wave Output ♦ 4MHz SPI Bus Supports Modes 1 and 3 ♦ Digital Temp Sensor Output: ±3°C Accuracy ♦ Register for Aging Trim ♦ RST Input/Output ♦ 300-Mil, 20-Pin SO Package ♦ Underwriters Laboratory (UL) Recognized DS3234 Ordering Information PART DS3234S# TEMP RANGE 0°C to +70°C PINPACKAGE 20 SO TOP MARK DS3234S Applications Servers Telematics Utility Power Meters GPS DS3234SN# -40°C to +85°C 20 SO DS3234SN # Denotes a RoHS-compliant device that may include lead that is exempt under the RoHS requirements. Lead finish is JESD97 Category e3, and is compatible with both lead-based and lead-free soldering processes. A "#" anywhere on the top mark denotes a RoHS-compliant device. Pin Configuration TOP VIEW Typical Operating Circuit VCC VCC SS SCLK MOSI MISO RST CPU CS SCLK DIN DOUT RST N.C. N.C. N.C. N.C. N.C. VCC INT/SQW 32kHz VBAT VPU CS 1 N.C. 2 32kHz 3 VCC 4 INT/SQW 5.


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