实时时钟中电源分布讨论

Intersil Real Time Clock (RTC) products now include many products with a variety of functions. Common functions include a low power 32,768kHz oscillator and also the ability to keep time in SRAM registers after initial time and date is set.

Application Note 1549


Addressing Power Issues in Real Time Clock
Applications
Introduction Many applications prefer to have these connections
powered separately. Examples include:
Intersil Real Time Clock (RTC) products now include
many products with a variety of functions. Common RTC device is powered down while the I2C bus and
functions include a low power 32,768kHz oscillator and microcontroller are active (not recommended since it
also the ability to keep time in SRAM registers after initial will violate RTC data sheet, but RTC devices are OK