İlginç bir Melez Çip (Bat.Backup RTC+Clock+EEPROM+SRAM)

[M.Salim GÜLLÜCE]

Battery-Backed I 2C Real-Time Clock/Calendar with SRAM, EEPROM and Protected EEPROM

Timekeeping Features
• Real-Time Clock/Calendar (RTCC):
- Hours, minutes, seconds, day of week, day, month, year
- Leap year compensated to 2399
- 12/24-hour modes
• Oscillator for 32.768 kHz Crystals:
- Optimized for 6-9 pF crystals
• On-Chip Digital Trimming/Calibration:
- ±1 ppm resolution
- ±129 ppm range
• Dual Programmable Alarms
• Versatile Output Pin:
- Clock output with selectable frequency
- Alarm output
- General purpose output
• Power-Fail Timestamp:
- Time logged on switchover to and from Battery mode

Low-Power Features
• Wide Voltage Range:
- Operating voltage range of 1.8V to 5.5V
- Backup voltage range of 1.3V to 5.5V
• Low Typical Timekeeping Current:
- Operating from V CC : 1.2 μA at 3.3V
- Operating from V BAT : 925 nA at 3.0V
• Automatic Switchover to Battery Backup

User Memory
• 64-Byte Battery-Backed SRAM
• 1 Kbit EEPROM Memory:
- Software write-protect
- Page write up to eight bytes
- Endurance: 1M Erase/Write cycles
• 64-Bit Protected EEPROM Area:
- Robust write unlock sequence
- EUI-48™ MAC address (MCP79411)
- EUI-64 ™ MAC address (MCP79412)

Datasheet Dökümanı

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