I2C™ & SPI Real-Time Clock/Calendar Families
Battery Switchover, Non-Volatile Memory, Unique Peripherals
Microchip Technology Incorporated
MCP795XX SPI RTCC Features
■ Three types of user memory
– SRAM: 64 bytes
– EEPROM: 1 and 2 Kbits
– Unique ID: 128 bits
■ Alarms
– Counts down to 0.01 seconds
■ Digital trimming
– Adjustment range of ~22 seconds/day
■ Watchdog timer
– Dual retriggers using SPI bus or GPIO
– From 15 msec to 64 sec
■ Event detect inputs
– High speed - Programmable count
– Low speed - Programmable debounce
■ Boot clock (boot devices only)
– 32 KHz clock output at powerup
■ Operating speed
– 10 MHz @ 4.5V
Feature Rich, Low Cost Timekeeping Solutions
Microchip’s Real-Time Clocks are highly integrated with non-volatile memory and cost effective features for real life applications.
This includes a battery switchover with timestamp to maintain timekeeping so the time and duration of any power failure can be
logged. When higher accuracy is needed, digital trimming can compensate for crystal frequencies that drift over temperature.
MCP794XX I2C RTCC Features
■ Three types of user memory
– SRAM: 64 bytes
– EEPROM: 0 and 1 Kbits
– Unique ID: 64 bits
■ Alarms
– Counts down to the second
■ Digital Trimming
– Adjustment range of ~11 seconds/day
■ Operating Speed
– 400 kHz
Baseline Features for all RTCCs
Timing
■ Programmable alarm/clock output
■ Wide digital trimming range for accuracy
■ Timestamp @ VCC Fail and VCC Restore
User Memory
■ Battery-backed SRAM
■ EEPROM
■ Unique ID/MAC address
Industry Standard Pinout
Low Power
■ Wide operating and backup voltages
– VCC = 1.8V to 5.5V
– VBAT = 1.3V to 5.5V
■ Standby currents
– ICC < 2 μA @ 3V
– IBAT < 700 nA @ 1.8V
Backup Power
– Automatic battery switchover