Data Sheet

Smart Machine Smart Decision

SIM800F_Hardware Design_V1.00 27 2015-07-31

port is still accessible, no matter which functionality mode it is in.

For detailed information about the AT Command “AT+CFUN=<fun>”, please refer to document

[1]

Table 7: Current consumption of Minimum Functionality Mode

<fun>

BS-PA-MFRMS Current consumption in sleep mode (mA)

0 N/A 0.55

9 0.85

5 0.95

2 1.30

4 N/A 0.60

4.4.2 Sleep Mode 1 (AT+CSCLK=1)

Users can control SIM800F module to enter or exit the sleep mode 1 (AT+CSCLK=1) by DTR signal. When DTR

is in high level and without interrupt (on air and hardware such as GPIO interrupt or data in serial port), SIM800F

will enter sleep mode 1 automatically. In this mode, SIM800F can still receive paging or SMS from network, but

the serial port is not accessible.

4.4.3 Wake Up SIM800F from Sleep Mode 1 (AT+CSCLK=1)

When SIM800F is in sleep mode 1 (AT+CSCLK=1), the following events can wake up the module:

 DTR is pulled down

 Receive a voice or data call from network

 Receive a SMS from network

Note: After module has received incoming call or new SMS, serial port can report URC, but the serial port can not input AT

command. Only after the DTR pin is pulled to low level for 50ms, the serial port can input AT command.

4.4.4 Sleep Mode 2 (AT+CSCLK=2)

In this mode, SIM800F will continuously monitor the serial port data signal. When there is no data transfer over 5

seconds on the RXD signal and there is no hardware interrupts (such as GPIO interrupt), SIM800F will enter sleep

mode 2 automatically. In this mode, SIM800F can still receive paging or SMS from network.

Note: The default setting of serial port is auto baud detection, in this case, the module cannot enter sleep mode 2 before

the synchronization of serial port baud rate between DTE and DCE.

4.4.5 Wake Up SIM800F from Sleep Mode 2 (AT+CSCLK=2)

When SIM800F is in sleep mode 2 (AT+CSCLK=2), the following events can wake up the module:

 Receive data via main serial port (the first several character will lose)

 Receive a voice or data call from network

 Receive a SMS from network