User's Manual

GE864
GE864GE864
GE864-
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-QUAD V2 / GE864
QUAD V2 / GE864QUAD V2 / GE864
QUAD V2 / GE864-
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-DUAL V2 Hardware User Guide
DUAL V2 Hardware User GuideDUAL V2 Hardware User Guide
DUAL V2 Hardware User Guide
1vv0300875 Rev.1 – 2010-03-29
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved. Page 29 of 73
6.2.1.3.
6.2.1.3.6.2.1.3.
6.2.1.3. Battery Source Power Supply Design Guidelines
Battery Source Power Supply Design GuidelinesBattery Source Power Supply Design Guidelines
Battery Source Power Supply Design Guidelines
The desired nominal output for the power supply is 3.8V and the maximum voltage
allowed is 4.5V. A single 3.7V Li-Ion cell battery type is suited for supplying the power
to the Telit GE864-QUAD V2 / GE864-DUAL V2 module.
CAUTION:
CAUTION:CAUTION:
CAUTION:
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 GE864-QUAD V2 / GE864-DUAL V2 and damage it.
CAUTION:
CAUTION:CAUTION:
CAUTION:
DO NOT USE any Ni-Cd, Ni-MH, and Pb battery types directly connected with GE864-
QUAD V2 / GE864-DUAL V2. Their use can lead to overvoltage on the GE864-QUAD V2
/ GE864-DUAL V2 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 typically used.
Make sure the low ESR capacitor (usually a tantalum one) is rated at least 10V.
A protection diode can be inserted close to the power input, in order to save the
GE864-QUAD V2 / GE864-DUAL V2 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 500mAh in order to withstand the current peaks
of 2A; the suggested capacity is from 500mAh to 1000mAh.
6.2.2. Thermal Design Guidelines
The thermal design for the power supply heat sink must be done with the following
specifications:
• Average current consumption during transmission @PWR level max:
500mA
• Average current consumption during transmission @ PWR level min:
100mA
• Average current during Power Saving (CFUN=5): from 1.6 to 3.9mA
• Average current during idle (Power Saving disabled): 19mA