Giái pháp thay thế cho DS1307

The MCP79410 general purpose I²C™Compatible real-time clock/calendar (RTCC) is highly integrated with nonvolatile memory and advanced features normally found in higher priced devices. These features include a battery switchover circuit for backup power, a timestamp to log power failures and digital trimming for accuracy. Using a low-cost 32.768 kHz crystal or other clock source, time is tracked in either a 12-hour or 24-hour format with an AM/PM indicator and timing to the second, minute, hour, day of the week, day, month and year. As an interrupt or wakeup signal, a multifunction open drain output can be programmed as an Alarm Out or as a Clock Out that supports 4 selectable frequencies. In addition, non-volatile memory is included along with a Unique ID in a locked section of EEPROM that can be unlocked and programmed by the End User.

General purpose RTCC with features that target low power and smart energy applications.

* Low Power Operation

      -    VCC Min = 1.8V

      -    Icc < 5 μA      Typical Dynamic Current

* Low Backup Power

      -    VBAT Min = 1.3V

      -    Ibat < 700nA '     Typical Timekeeping & SRAM Retention Current

* Automatic Battery Switchover with Timestamp

      -    VCC to VBAT '     (Power lost)

      -    VBAT to VCC '     (Power restored)

* Dual alarms with single IRQ Output that operates on VCC or VBAT

* Clock Out frequencies of 32.768, 8.192 & 4.096 KHz and 1 Hz

* Digital Trimming Range from -127 to +127ppm in 1ppm steps

      -    1 ppm is approximately 86 milliseconds/day

* EEPROM has 8 Bytes/Page with Block Sector write protection

      -    Protect none, 1/4, 1/2 or all of array

* Factory standard or custom ID programming available

Parameter Name	Value
Max Communications Speed	400 KHz
Pin Count	8
Minimum Clock Count (seconds)	1 sec
Battery-backed SRAM (Bytes)	64
EEPROM (Kbits)	1
Unique ID (bits)	64
Unique ID Programming	Blank ID
Temperature Range (C)	-40 to +85

Detais...

MCP7941X I2C RTCC with EEPROM, SRAM, Unique ID and Battery Switchover