The MCP79510-I/MS is a SPI Real-time Clock and Calendar (RTCC) IC, 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 blank unique ID in a locked section of EEPROM. The ID is blank in this device, but can also be ordered with a 48 or 64-bit MAC address. Along with a 32,768kHz crystal, this RTCC tracks time using several internal registers and then communicates the data over a 5MHz SPI bus that is fast enough to support a programmable millisecond alarm. As part of the power sense circuit, a time saver function is implemented to store the time when main power is lost and again, when power is restored to log the duration of a power failure.
- Hours, Minutes, Seconds, Hundredth of Seconds, Day of Week, Month, Year Real-time Clock/Calendar
- Crystal Oscillator Requires External 32.768kHz Tuning Fork Crystal and Load Capacitors
- 1Hz, 4.096kHz, 8.192kHz, 32.768kHz Clock Out Function
- 2 Programmable Alarms
- Programmable Open Drain Output, Alarm or Interrupt
- ±255PPM Range in 1 PPM Steps On-chip Digital Trimming/Calibration
- Logs Time When VCC Fails and VCC is Restored Power-fail Time-stamp at Battery Switchover
- Low-power Consumption
- 1.3 to 3.6V VBAT
- <1μA at 3V VCC Standby Current
- <700nA at 1.8V VBAT Timekeeping Current
- Backup Power for Timekeeping and SRAM Retention Automatic Battery Switchover from VCC to VBAT
- 64-byte Battery-backed SRAM
- 2kb and 1kb EEPROM Memory
- Software Block Write-protect (1/4, 1/2 or Entire Array)
- Write Page Mode (up to 8 Bytes)
- 1M Erase/Write Cycles Endurance
- SPI Clock Speed up to 5MHz
时钟与计时, 车用
