User's Manual

PH8/PH8-P Hardware Interface Overview
3.2 Power Supply
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PH8_PH8-P_HD_v02.000 Page 21 of 46 2011-10-21
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3.2 Power Supply
PH8/PH8-P needs to be connected to a power supply at the board-to-board connector - 5 lines
each BATT+ and GND.
The power supply of PH8/PH8-P has to be a single voltage source at BATT+. It must be able
to provide the peak current during the uplink transmission.
All key functions for supplying power to the device are handled by the power management IC.
It provides the following features:
• Stabilizes the supply voltages for the baseband using switching regulators and low drop lin-
ear voltage regulators.
• Switches the module's power voltages for the power-up and -down procedures.
• Delivers, across the VEXT line, a regulated voltage for an external application. This voltage
is not available in Power-down mode and can be reduced via AT command to save power.
• SIM switch to provide SIM power supply.