Microchip Technology, Inc. Enhanced Feature Battery-Backed SPI Real-Time Clock/Calendar MCP795W11

The MCP795W11 SPI RTCC is highly integrated with memory and advanced features normally found in higher priced devices. By starting with a basic real-time clock, digital trimming was added for higher accuracy, a battery switchover for backup power, a timestamp to log power failures and three types of memory, which includes SRAM, EEPROM and a unique ID in a locked section of EEPROM that is preprogrammed with a 48-bit MAC Address that can also be ordered blank for the end user to program. By adding a watchdog timer and two programmable event detect inputs, lower power and more system robustness can be achieved by off-loading MCU functions and allowing it to sleep for longer periods of time. Additional Features Full Featured RTCC targets smart energy, communications and home appliance applications. Low Power Operation VCC Min = 1.8V Icc < 1 µA Typical Standby Current Low Backup Power VBAT Min = 1.3V Ibat < 700nA Typical Timekeeping & SRAM Retention Current Automatic Battery Switchover with Timestamp VCC to VBAT (VCC Lost) VBAT to VCC (VCC Restored) Dual configurable alarms with a 0.01 sec count on one alarm IRQ (VCC or VBAT) WDO (VCC) Clock Out frequencies: 32.768, 8.192 & 4.096 KHz and 1 Hz Digital Trimming Range from -255 to + 255 ppm in 1 ppm steps Adjusts up to 22 seconds/day Watchdog Timer - Dual Retriggers SPI Bus or EVHS digital input Dual Configurable Event Detects High speed with programmable pulse count (EVHS) Low speed with programmable debounce delay (EVLS) EEPROM has 8 Bytes/Page with Block Sector write protection Protect: None, 1/4, 1/2 or all of array Unique ID is factory programmed with MAC Address