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Is it possible to supply power only to RTC ?

Latest Updated:03/25/2009

Question:

Is it possible to supply power only to the RTC and to stop supplying power to modules other than the RTC?

Answer:

SH7709S, SH7729R, SH7706, SH7720:
In hardware standby mode, it is possible to stop supplying power to the power supply pins except for the RTC power supply pins.
Power supply of modules other than the RTC is in OFF state when turning off modules other than the RTC.
At this time, the status of pins except the pins related to the RTC module is undefined.

Regarding SH7709S, SH7729R, SH7706, SH7720 RTC, except for when in hardware standby mode, power must be supplied to all power supply pins, including these RTC power supply pins, even if only the RTC is used (at the time of software standby mode).

SH7727, SH7705 are not supported.
Both in hardware standby mode and in all other modes, power must be supplied to all power supply pins, including these RTC power supply pins.

Suitable Products
SH7729R
SH7720
SH7709S
SH7706