FT93xRTC External Power Switch Circuit

FT93xRTC External Power Switch Circuit

This application note describes implementing a simple circuit for the FT930/FT931RTC external power supply switch. The Texas Instruments SN74AUC2G53 Single-Pole Double-Throw (SPDT) analog switch is used to select the power supplied by the 1.5V battery or by the 1.2V internal LDO. You can find other interesting Electronic circuits in this Circuits library

This circuit has two power source inputs (VCC1V2 and 1.5V Battery) and one output (VDDBAT). VCC33is used as a control signal via the resistor divider circuit R1 and R2.VCC1V2 is the internal regulator out put of the FT930/FT931;it connects to VCC33 internally.U1is a Texas Instruments SN74AUC2G53 Single-PoleDouble-Throw (SPDT) analog switch. It can operate from 0.8V to 2.7V with low power consumption. It can still operate if the battery voltage drops to 0.9V.

FT93xRTC External Power Switch Circuit – [PDF]

Please follow and like us:
Pin Share
About mixos

Mike is the founder and editor of Electronics-Lab.com, an electronics engineering community/news and project sharing platform. He studied Electronics and Physics and enjoys everything that has moving electrons and fun. His interests lying on solar cells, microcontrollers and switchmode power supplies. Feel free to reach him for feedback, random tips or just to say hello :-)

view all posts by admin
Notify of

Inline Feedbacks
View all comments
Get new posts by email:
Get new posts by email:

Join 97,426 other subscribers