Installation Instructions

SIM5216A _HD_V1.02 Hardware Design

SIM5216A _HD_V1.02 26.08.2010

3.4.2.3 Under-voltage automatic warning

Software will constantly monitor the voltage applied on the VBAT, if the measured battery voltage

is no more than 3.4V, the following URC will be presented:

warning! voltage is low : 3.3v

Note: Under-voltage automatic warning function default is disabled. One can enable it by

AT+CVALARM.

3.4.2.4 Under-voltage automatic shutdown

Besides the Under-voltage automatic warning, system will monitor the working voltage and power

off the module if the voltage is lower to a specified value which can be set by AT+CPMVT in

order to protect the module.

Note: this feature default is disabled, One can use AT+CPMVT to active it.

At this moment, no more AT commands can be executed. The module will be logged off from

the network and enters POWER DOWN mode, only the RTC is still active (if backup battery is

connected to VRTC pin).

3.5 Power saving

There are two methods to achieve SIM5216A module extreme low power. “AT+CFUN” is used to

set module into minimum functionality mode and GPIO4 hardware interface signal can be used to

set system to be Flight mode (Close RF).

3.5.1 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

z 0: minimum functionality, (same as CFUN=4,disable both transmit and receive RF circuits

of the phone);

z 1: full functionality (Default);

z 4: disable both transmit and receive RF circuits of the phone;

If SIM5216A has been set to minimum functionality by “AT+CFUN”, then the RF function

function will be closed, in this case, the serial port is still accessible, but all AT commands referred

to RF function or SIM card function will not be accessible.

When SIM5216A is in minimum functionality or has disabled all RF functionality by

“AT+CFUN”, it can return to full functionality by “AT+CFUN”, not need to reset module.

NOTE: In fact, Flight mode is identical with minimum functionality mode .Different titles lie