Users Manual

GSM/GPRS Module Series
M66 Hardware Design
M66_Hardware_Design Confidential / Released 33 / 82
3.5.4. Summary of State Transition
Table 6: Summary of State Transition
3.6. RTC Backup
The RTC (Real Time Clock) function is supported. The RTC is designed to work with an internal power
supply.
There are three kinds of designs for RTC backup power:
 Use VBAT as the RTC power source.
When the module is turned off and the main power supply (VBAT) is remained, the real time clock is still
active as the RTC core is supplied by VBAT. In this case, the VRTC pin can be kept floating.
 Use VRTC as the RTC power source.
If the main power supply (VBAT) is removed after the module is turned off, a backup supply such as a
coin-cell battery (rechargeable or non-chargeable) or a super-cap can be used to supply the VRTC pin to
keep the real time clock active.
 Use VBAT and VRTC as the RTC power source.
As only powering the VRTC pin to keep the RTC will lead an error about 5 minutes a day, it is
recommended to power VBAT and VRTC pin at the same time when RTC function is needed. The
recommended supply for RTC core circuits are shown as below.
Current Mode
Next Mode
Power Down Normal Mode Sleep Mode
Power Down Use PWRKEY
Normal Mode
AT+QPOWD, use
PWRKEY pin
Use AT command
AT+QSCLK=1 and pull up
DTR
SLEEP Mode Use PWRKEY pin
Pull DTR down or incoming
call or SMS or GPRS