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FIBOCOM NL668-LA Series Hardware Guide
Page 26 of 61
Figure 5-2 Button switch power on reference circuit
Figure 5-3 shows power on timing.
Figure 5-3 Power on timing
Note:
Before pull down PWRKEY pin, the Voltage of VBAT must be stable, recommended time
interval between VBAT enable and pull down PWRKEY pin at least 30ms.
5.1.1.2 Power Off
The module supports three power off methods as table 5-2.