Fibocom L831-EAU-01 - Module Start-Up

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L831-EAU-01 Hardware User Manual Page
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3.3.1 Module Start-Up
3.3.1.1 Start-up Circuit
By pulling up 1.8V/3.3V voltage externally, the module power-on pin FULL_CARD_POWER_OFF# can
power on, while the pull-up voltage VDD (1.8V/3.3V) is provided externally. The module provides two
power-on modes:

AP (Application Processor) controls 3.3V power module for powering on, the recommended circuit
design is shown in Figure 3-3:
 Battery-powered, AP controls FULL_CARD_POWER_OFF# module for powering on, the
recommended circuit design is shown in Figure 3-4:
Figure 3-3 Power-on Circuit of AP Controlling 3.3V Power Module
Figure 3- 4 Power-on Circuit of AP Controlling FULL_CARD_POWER_OFF# Module