Minimize Power Consumption; Current Consumption - SimCom SIM5215 Hardware Design

5.2.2

Minimize Power Consumption

There are two modes that SIM5215&SIM5216 achieves low power consumption.
Sleep mode
If peripheral equipments stops working, and there is no on air or hardware interrupts (such as GPIO
interrupts or data on UART), SIM5215&SIM5216 will enter sleep mode automatically. In this mode,
SIM5215&SIM5216 can still receive paging，voice call or SMS from network. If USB interface of
SIM5215&SIM5216 is connected to host CPU, but host CPU does not support USB suspending, then
SIM5215&SIM5216 will not enter sleep mode. After USB is disconnected, SIM5215&SIM5216 will enter
sleep mode.
Note: When UART interface is connected with host CPU, SIM5215&SIM5216 can not enter sleep mode until RXD is
pulled down by the host CPU. If the module is in the idle mode, make sure to pull the RXD to low level by host CPU.
SIMCom recommends using UART_DTR to wake up the module from host CPU and to use UART_RI to wake up the
host CPU. Before designing, pay attention to how to realize waking function and refer to Document [24] and Document
[25] for more detail.
Minimum functionality mode
Minimum functionality mode ceases a majority function of module, thus minimizing the power
consumption. This mode is set by the AT command which provides a choice of the functionality levels.
AT+CFUN=0: Minimum functionality
●
AT+CFUN=1: Full functionality (Default)
●
AT+CFUN=4: Disable RF function of the module (Flight mode)
●
If SIM5215&SIM5216 has been set to minimum functionality mode, the module will firstly enter sleep
mode, then the RF function and SIM card function will be closed. In this case, the serial port is still
accessible, but RF function or SIM card will be unavailable. When SIM5215&SIM5216 is in minimum
functionality or flight mode, it can return to full functionality by the AT command "AT+CFUN=1".
Note: For flight mode, please refer to Chapter 3.10.2.
5.3

Current Consumption

The current consumption in suspended mode and without USB connection is listed in the table below.
Here, "suspended mode" means that SIM5215&SIM5216 is connected to USB bus, but it does not transfer
data.
SIM5215&SIM5216_Hardware Design_V2.02
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2012-08-31