The MCP79521 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. This ID is preprogrammed with a 48-bit MAC Address, but it can also be ordered blank for the end user to program.
Additional Features General purpose SPI RTCC with features that target low power, security & communications applications.
Low Power Operation
VCC Min = 1.8V
Icc < 5 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)
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
EEPROM has 8 Bytes/Page with Block Sector write protection
Protect: None, 1/4, 1/2 or all of array
Factory standard MAC address programming or custom ID available
The MCP79521 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. This ID is preprogrammed with a 48-bit MAC Address, but it can also be ordered blank for the end user to program.
Additional Features
General purpose SPI RTCC with features that target low power, security & communications applications.
- Low Power Operation
- VCC Min = 1.8V
- Icc < 5 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
- 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
- EEPROM has 8 Bytes/Page with Block Sector write protection
- Protect: None, 1/4, 1/2 or all of array
- Factory standard MAC address programming or custom ID available
