Real Time Clock; Vbackup Description - Fibocom G610 Hardware User Manual

CTS_N enabled, the data will not be lost. And G610 will go back to Idle mode for response.
b) The G610 serial interfaces be set NONE FLOW (AT+IFC=0,0)(The default value)
If the G610 serial interfaces be set NONE FLOW by AT+IFC command, and the DTE serial
interfaces was running with NONE FLOW, the TXD data will be sent to G610 anytime,
be lost. But then G610 will go back to idle mode if data and CTS_N enabled at the same time.
3.5.3.2 Permanent termination of Sleep Mode
The G610 Sleep mode is enabled and disabled by the ATS24 command.
 ATS24 : ATS24 = 0 disables Sleep mode. The value of ATS24 (>0) will be saved but the
mode will not be save by re-power G610.

3.6 Real Time Clock

G610 incorporates a Real Time Clock (RTC) mechanism that performs many internal functions,
one of which is keeping time. The RTC subsystem is embedded in the PMU and operates in all of
the G610 operating modes (Off, Idle, Sleep), as long as power is supplied above the minimum
operating level.
When the main power was not supply, the backup battery or capacitor can be supplied to RTC
by interface connector VBACKUP.
When the main power supply and VBACKUP is disconnected from G610, the RTC timer will
reset and the current time and date will be lost. On the next G610 power-up the time and date will
need to be set again automatically or manually.

3.6.1 VBACKUP description

G610 Pin#
8
 When main power BATT is supplied. The VBACKUP output 2.0V/0.3mA current for
external battery or capacitor charging
 When main power BATT is disconnected. The VBACKUP supply the RTC by. External
battery or capacitor. The RTC power consumption is about 12uA. The voltage cannot be
over 2.2V.
 The VBACKUP is supplied by a capacitor. The backup time can be calculated by
capacitance approximately.
G610 GPRS Module Hardware User Manual
G610 Signal name
VBACKUP
Description
Real time clock power
the data will
Page 22 of 47