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too big; otherwise the level of RESET could be lower than threshold value; RESET hardware parameters can

refer to the table below:

Table 7: Electronic characteristic of the RESET pin

Pin name

Symbol

Min

Typ

Max

Unit

VIH

2.4

VIL

0.6

RESET

Low power time

105

The reset scenarios are illustrated in the following figures.

Figure 16: Reset timing sequence

4.3. Power Saving Mode

SIM800H&SIM800L has two power saving modes: Minimum functionality mode and sleep mode. AT command

“AT+CSCLK=1”can be used to set SIM800H&SIM800L into sleep mode. AT command

“AT+CFUN=<fun>“ can be used to set SIM800H&SIM800L into minimum functionality. When

SIM800H&SIM800L is in sleep mode and minimum functionality mode, the current of module is lowest.

4.3.1.

Minimum Functionality Mode

There are three functionality modes, which could be set by AT command “AT+CFUN=<fun>“. The command

provides the choice of the functionality levels <fun>=0,1,4.

AT+CFUN=0： Minimum functionality.

AT+CFUN=1： Full functionality (default).

AT+CFUN=4： Flight mode (disable RF function).

Table 8: The current consumption of Minimum Functionality Mode (BS-PA-MFRMS=9)

<fun>

Current consumption(mA) (sleep mode)

0.83

1.04

0.92

Minimum functionality mode minimizes the current consumption to the lowest level. If SIM800H&SIM800L

SIM800H&SIM800L_Hardware Design_V2.02

2015-07-27

SIM800H 데이터시트(PDF) 26 Page - SIMCom