Monitoring Power Supply; Power Up And Power Down Scenarios; Turn On Sim5218E - SimCom SIM5218E Hardware Design

SIM5218E Hardware Design

3.3.3 Monitoring power supply

To monitor the supply voltage, you can use the AT command which include two parameters:
voltage supply status and voltage value (in mV). It returns the battery voltage 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 SIM5218E

SIM5218E can be turned on by various ways, which are described in following chapters:
Via POWER_ON pin: starts normal operating mode;
You can turn on the SIM5218E 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
Note1: Ton >= 64ms.
Note2: Commonly, the AT command can be set after 2-3S from the SIM5218E is power on.
If VBAT was supply to SIM5218E, SIM5218E could be automatically power on by connecting
Power ON pin to Low level directly. Below is the reference circuit.
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SIM5218E_HD_V1.03 11.06.2009