MAX6902 Datasheet | Maxim Integrated

Description The MAX6902 SPI™-patible real-time clock contains a real-time clock/calendar and 31 x 8 bits of static random-access memory (SRAM). The real-time clock/calendar provides seconds, minutes, hours, day, date, month, year, and century information. A time/date programmable polled ALARM is included in the MAX6902. The end-of-the-month date is automatically adjusted for months with fewer than 31 days, including corrections for leap year up to the year 2100. The clock operates in either the 24hr or 12hr format with an AM/PM indicator. The MAX6902 operates with a supply voltage of +2V to +5.5V, is available in the ultra-small 8-pin TDFN package, and works over the -40°C to +85°C industrial temperature range. Features o Real-Time Clock Counts Seconds, Minutes, Hours, Day of Week, Date of Month, Month, Year, and Century o Leap-Year pensation Valid up to Year 2100 o +2V to +5.5V Wide Operating Voltage Range o SPI Interface: 4MHz at 5V; 1MHz at 2V o 31 x 8-Bit SRAM for Scratchpad Data Storage o Uses Standard 32.768k Hz, 12.5p F Watch Crystal o Low Timekeeping Current (400n A at 2V) o Single-Byte or Multiple-Byte (Burst Mode) Data Transfer for Read or Write of Clock Registers or SRAM o Ultra-Small 8-Pin 3mm x 3mm x 0.8mm TDFN Package o Programmable Time/Date Polled ALARM Function o No External Crystal Bias Resistors or Capacitors Required Applications Point-of-Sale Equipment Intelligent Instruments Fax Machines Battery-Powered Products Portable Instruments Ordering Information PART MAX6902ETA-T TEMP RANGE -40°C to +85°C PINPACKAGE 8 TDFN TOP MARK AGT Related Real-Time Clock Products PART MAX6900 MAX6901 MAX6902 SERIAL INTERFACE I2C™ patible 3 Wire SPI patible SRAM 31 ✕ 8 31 ✕ 8 31 ✕ 8 ALARM FUNCTION - Polled Polled OUTPUT FREQUENCY - 32k Hz - PINPACKAGE 6 TDFN 8 TDFN 8 TDFN Typical Operating Circuit +3.3V 0.1µF 6 +3.3V VCC MAX6902 1 µc 5 2 3 SCLK CS DOUT DIN GND 4 X1 8 32.768k Hz CRYSTAL Pin Configuration TOP VIEW SCLK 1 DOUT DIN 2 8 7 X1 X2 VCC...