SimCom SIM800L User Manual

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SIM800L(MT6261)_Hardware Design_V1.01 23 2016-07-07
VIL<0.7V
Undefined
Active
t>55ms
VBAT
PWRKEY
(INPUT)
t>3s
VDD_EXT
STATUS
t>1s
Serial port
T>1.5s
Figure 12: Timing of power on module
When power on procedure is completed, SIM800L will send following URC to indicate that the module is ready
to operate at fixed baud rate.
RDY
This URC does not appear when autobauding function is active.
Note: Customer can use AT command “AT+IPR=x” to set a fixed baud rate and save the configuration to non-volatile flash
memory. After the configuration is saved as fixed baud rate, the Code “RDY” should be received from the serial port every time
when SIM800L is powered on. For details, please refer to the chapter “AT+IPR” in document [1].
4.2.2. Power down SIM800L
SIM800L will be powered down in the following situations：
 Normal power down procedure: power down SIM800L by the PWRKEY pin.
 Normal power down procedure: power down SIM800L by AT command “AT+CPOWD=1”.
 Abnormal power down: over-voltage or under-voltage automatic power down.
4.2.2.1. Power down SIM800L by the PWRKEY Pin
Customer can power down SIM800L by pulling down the PWRKEY pin for at least 1.5 second and release.
Please refer to the power on circuit. The power down timing is illustrated in the following figure.
PWRKEY
VDD_EXT
STATUS
V
IL
<0.7V
Serial port
UndefinedActive
(INPUT)
T3=2s
1.5s<T1<33s
T2≥2s
Figure 13: Timing of power down SIM800L by PWRKEY
This procedure makes the module log off from the network and allows the software to enter into a secure state to
save data before completely shut down. Before the power down procedure, the module will send URC:
NORMAL POWER DOWN
SIMCOM CONFIDENTIAL FILE

SimCom SIM800L Specifications

General

Brand	SimCom
Model	SIM800L
Category	Recording Equipment
Language	English