GSM/GPRS/GNSS Module Series
MC60 Series Hardware Design
MC60_Series_Hardware_Design Confidential / Released 34 / 114
Large Capacitance
Capacitor
Power Supply
LDO/DCDC
LDO
RTC
Core
GSM Part
GNSS Part
Backup
Domain
VBAT
VRTC
MC60
SYSTEM_3.3V
Figure 13: VRTC is Powered by a Capacitor
A rechargeable or non-chargeable coin-cell battery can also be used here. For more information, please
visit http://www.sii.co.jp/en.
As SYSTEM_3.3V is used for battery charging, it is recommended to keep it powered for the longest time
in all system power supplies.
3.6. Operating Modes
3.6.1. Operating Modes of GSM Part
The table below briefly summarizes the various operating modes of GSM part mentioned in the following
chapters.
Table 9: Operating Modes Overview of GSM Part
Modes
Function
GSM Normal
Operation
GSM/GPRS
Sleep
After enabling Sleep mode by
AT+QSCLK=1
, the GSM part will
automatically enter into Sleep mode if DTR is set to high level
and there is no interrupt (such as GPIO interrupt or data on
UART port). In this case, the current consumption of the GSM
part will reduce to the minimal level.
During Sleep mode, the GSM part can still receive paging
NOTE
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