User's Manual

LE940B6 Hardware User Guide
1VV0301331 Rev. 1.8 - 2017-03-15
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6.2.1.3. Battery Source Power Supply – Design Guidelines
• The desired nominal output for the power supply is 3.8V, and the maximum allowed voltage
is 4.2V. Hence, a single 3.7V Li-Ion cell battery type is suitable for supplying the power to the
LE940B6 module.
NOTE:
Do not use any Ni-Cd, Ni-MH, and Pb battery types directly connected to the LE940B6 module.
Their use can lead to overvoltage on the LE940B6 and damage it. Use only Li-Ion battery types.
• A bypass low ESR capacitor of adequate capacity must be provided to cut the current
absorption peaks; a 100μF tantalum capacitor is usually suitable.
• Make sure that the low ESR capacitor (usually a tantalum one) is rated at least 10V.
• A protection diode must be inserted close to the power input to protect the LE940B6 module
from power polarity inversion. Otherwise, the battery connector must be done in a way to
avoid polarity inversions when connecting the battery.
• The battery capacity must be at least 500 mAh to withstand the current peaks of 2A. The
suggested capacity is from 500 mAh to 1000 mAh.