LE910Cx
Hardware User Guide
1VV0301298 Rev. 1.05 - 2017-06-18
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59 of 117
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 LE910Cx module.
NOTE:
Do not use any Ni-Cd, Ni-MH, and Pb battery types directly connected to the LE910Cx module.
Their use can lead to overvoltage on the LE910Cx 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 (on both VBATT and
VBATT_PA together).
•
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 LE910Cx
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 900 mAh to withstand the current peaks of 2A.