Giái pháp thay thế cho DS1307The 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 availableParameter NameValue 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 +85Detais...MCP7941X I2C RTCC with EEPROM, SRAM, Unique ID and Battery Switchover

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