Charger Requirements; Power Saving; Minimum Functionality Mode - SimCom SIM548C HD V1.01 Hardware Design

SIM548C Hardware Design
AT command
AT+CALARM
AT+CCLK
AT+CPOWD
AT+CBC
AT+CFUN

3.5.5 Charger requirements

Following is the requirements of charger for the GSM part of the module.
- Simple transformer power plug
- Output voltage: 5.0V-5.25V
- Charging current limitation: 650mA
- A 10V peak voltage is allowed for maximum 1ms when charging current is switched off.
- A 1.6A peak current is allowed for maximum 1ms when charging current is switched on.

3.6 Power saving

There are two methods for the module to enter into low current consumption status. "AT+CFUN"
is used to set module into minimum functionality mode and DTR hardware interface signal can be
used to lead system to be in SLEEP mode (or slow clocking mode).

3.6.1 Minimum functionality mode

Minimum functionality mode reduces the functionality of the module to a minimum and, thus,
minimizes the current consumption to the lowest level. This mode is set with the "AT+CFUN"
command which provides the choice of the functionality levels <fun>=0，1，4
0: minimum functionality;
1: full functionality (default);
SIM548C_HD_V1.01
Function
Set alarm time
Set data and time of RTC
Power down
Indicated charge state and voltage
Start or close the protocol
Set AT command" AT+CFUN =1",module
can be transferred from GHOST mode to
Charging in normal mode, In GHOST
mode , the default value is
38
09.05.2008