MCP79410/MCP79411/MCP79412 2 I C Real-Time Clock/Calendar with EEPROM, SRAM, Unique ID and Battery Switchover Device Selection Table Description: Part EEPROM SRAM The MCP7941X series of low-power Real-Time Clocks Unique ID Number (Kbits) (Bytes) (RTC) uses digital timing compensation for an accurate clock/calendar, a programmable output control for MCP79410 1K 64 Blank versatility, a power sense circuit that automatically MCP79411 1K 64 EUI-48 switches to the backup supply, and nonvolatile memory for data storage. Using a low-cost 32.768 kHz crystal, MCP79412 1K 64 EUI-64 it tracks time using several internal registers. For Features: 2 communication, the MCP7941X uses the I C bus. Real-Time Clock/Calendar (RTCC), Battery The clock/calendar automatically adjusts for months Backed: with fewer than 31 days, including corrections for - Hours, Minutes, Seconds, Day of Week, Day, leap years. The clock operates in either the 24-hour Month and Year or 12-hour format with an AM/PM indicator and settable alarm(s) to the second, minute, hour, day of - Dual alarm with single output the week, date or month. Using the programmable On-Chip Digital Trimming/Calibration: CLKOUT, frequencies of 32.768, 8.192 and 4.096 - Range -127 to +127 ppm kHz and 1 Hz can be generated from the external - Resolution 1 ppm crystal. Programmable Open-Drain Output Control: Along with the on-board Serial EEPROM and battery- - CLKOUT with 4 selectable frequencies backed SRAM memory, a 64-bit protected space is - Alarm output available for a unique ID or MAC address to be 64 Bytes SRAM, Battery Backed programmed at the factory or by the end user. 1 Kbits EEPROM (128x8): The device is fully accessible through the serial - 8 bytes/page interface while VCC is between 1.8V and 5.5V, but can operate down to 1.3V for timekeeping and SRAM - Block/sector write protection retention only. - Protect none, 1/4, 1/2 or all of array The RTC series of devices are available in the standard Separate 64-Bit Unique ID: 8-lead SOIC, TSSOP, MSOP and 2x3 TDFN packages. - User or factory programmable - Protected area Package Types -EUI-48 or EUI-64 MAC address MSOP - Custom ID programming X1 1 8 VCC Automatic VCC Switchover to VBAT Backup Supply X2 2 7 MFP TDFN Power-Fail Time-Stamp for Battery Switchover V 3 6 SCL BAT Low-Power CMOS Technology: X1 1 8 VCC VSS 4 5 SDA 7 MFP X2 2 - Dynamic Current: 400 A max read VBAT SCL 3 6 SOIC, TSSOP - Dynamic Current: 3mA max EEPROM write VSS 5 4 SDA - Battery Backup Current: <700nA 1.8V 1 8 X1 VCC 100 kHz and 400 kHz Compatibility 2 7 X2 MFP ESD Protection >4,000V 3 6 V SCL BAT More than 1 Million Erase/Write Cycles 4 5 VSS SDA Packages include 8-Lead SOIC, TSSOP, 2x3 TDFN, MSOP Pb-Free and RoHS Compliant Temperature Ranges: - Industrial (I): -40C to +85C. 2010 Microchip Technology Inc. Preliminary DS22266A-page 1MCP7941X FIGURE 1-1: TYPICAL OPERATING CIRCUIT X1 RTCC VDD Time-Stamp/ SRAM Alarms X2 MFP 2 VBAT VBAT Switch I C SCL VSS SDA EEPROM ID DS22266A-page 2 Preliminary 2010 Microchip Technology Inc. Oscillator