Telit Wireless Solutions GL865 V3, Руководство пользователя

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HW User Guide
1vv0301018 Rev. 15 Page 27 of 72 2019-01-07
Battery Source Power Supply Design Guidelines
• The desired nominal output for the power supply is 3.8V and the maximum voltage
allowed is 4.2V, hence a single 3.7V Li-Ion cell battery type is suited for supplying
the power to the Telit GL865 V3/V3.1 module.
WARNING:
The three cells Ni/Cd or Ni/MH 3.6 V Nom. battery types or 4V PB
types MUST NOT BE USED DIRECTLY since their maximum voltage
can rise over the absolute maximum voltage for the GL865 V3/V3.1
and damage it.
NOTE:
DON'T USE any Ni-Cd, Ni-MH, and Pb battery types directly
connected with GL865 V3/V3.1. Their use can lead to overvoltage on
the GL865 V3/V3.1 and damage it. USE ONLY Li-Ion battery types.
•
A Bypass low ESR capacitor of adequate capacity must be provided in order to cut
the current absorption peaks, a 100μF tantalum capacitor is usually suited.
•
Make sure the low ESR capacitor (usually a tantalum one) is rated at least 10V.
•
A protection diode should be inserted close to the power input, in order to save the
GL865 V3/V3.1 from power polarity inversion. Otherwise the battery connector
should be done in a way to avoid polarity inversions when connecting the battery.
•
The battery capacity must be at least 500mAh in order to withstand the current peaks
of 2A; the suggested capacity is from 500mAh to 1000mAh.