User's Manual

Smart Machine Smart Decision

SIM7100A_User Manual_V1.01 2014-12-11

5.2.3 Sleep mode

If peripheral equipments stops working, and there is no on air or hardware interrupts (such as GPIO

interrupts or data on UART), SIM7100A will enter sleep mode automatically. In this mode, SIM7100A can

still receive paging，voice call or SMS from network. If USB interface of SIM7100A is connected to host

CPU, but host CPU does not support USB suspending, then SIM7100A will not enter sleep mode. After

USB is disconnected, SIM7100A will enter sleep mode.

Note: When UART interface is connected with host CPU, SIM7100A cannot 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 GPIO43 or DTR to wake up the module from host

CPU and to use GPIO41 or 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.

5.2.4 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 SIM7100A 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 SIM7100A is in minimum functionality or flight mode, it

can return to full functionality by the AT command “AT+CFUN=1”.

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 SIM7100A is connected to USB bus, but it does not transfer data.

Table 47: Current consumption

OFF state

OFF state supply current Power down 10uA

UMTS Sleep/Idle Mode (without USB connection)

WCDMA supply current

(GNSS off)

Sleep mode@DRX=9 1.1 mA

Sleep mode @DRX=8 1.3 mA

Sleep mode @DRX=6 2.8 mA

Idle mode @DRX=6 15 mA