Specifications

L506 Hardware Design

Figures 3-17Power on Timing sequence

Note: the STATUS pin can be used to identify whether has been power on, when the module has

access to electricity and initialization is completed, the STATUS output high level, or has

maintained low level.

3.9.3 Power off sequence

The following methods can be used to power down. These procedures will make module disconnect

from the network and allow the software to enter a safe state, and then save data before completely

powering the module off.

● Method 1: Power off L506 by pulling the PWRKEY pin down (This function needs to apply

to our company)

● Method 2: Power off L506 by AT command “AT+CPOF”

● Method 3: over-voltage or under-voltage automatic power down.

● Method 4: over-temperature or under-temperature automatic power down.

Note: 1. About the AT command “AT+CPOF” detail please refer document [1].

2. Over-voltage or under-voltage may cause automatic power down.

3. Over-temperature or under-temperature may cause automatic power down.

3.9.4 Reset sequence

L506 can lower module RESET pin to restart the module.

Table 3-17 Reset pin electrical properties

Symbol

Net name

Min.

Typ.

Max.

Unit

Treset

Reset pin low level hold time

180

600

VIH

Reset pin input high level

1.17

1.8

2.1

VIL

Reset pin input low level

-0.3

0.3