Installation Instructions

SIM5216A _HD_V1.02 Hardware Design
SIM5216A _HD_V1.02 26.08.2010
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3.3.2 Minimizing power losses
Please pay special attention to the supply power when you are designing your applications.
Please make sure that the input voltage will never drop below 3.3V even in a transmit burst
during which the current consumption may rise up to 2A. If the power voltage drops below
3.3V, the module may be switched off. Using the board-to-board connector will be the best
way to reduce the voltage drops. You should also remove the resistance from the power
supply lines on the host board or from battery pack.
3.3.3 Monitoring power supply
To monitor the supply voltage, you can use the AT command(AT+CBC) which include two
parameters: voltage supply status and voltage value (in mV). It returns the battery voltage of
1-100 percent of capacity and actual value measured at VBAT and GND.
The voltage is continuously measured at intervals depending on the operating mode. The
displayed voltage (in mV) is averaged over the last measuring period before the AT command was
executed.
3.4 Power up and power down scenarios
3.4.1 Turn on SIM5216A
SIM5216A can be turned on by various ways, which are described in the following chapters:
z Via POWER_ON pin: starts normal operating mode;
POWER_ON has been pulled up to VBAT in module. You can turn on the SIM5216A by driving
the POWER_ON to a low level voltage for period time. The power on scenarios illustrate as
following figure.
Figure 5: Timing of turn on system