Telit Communications S.p.A. GC864Q2 ユーザーズマニュアル
GC864 Hardware User Guide
1vv0300874 Rev.0 – 2010-01-25
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved.
Page 27 of 64
6.2.1.3.
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 GC864-QUAD V2 / GC864-DUAL V2 module.
allowed is 4.5V. A single 3.7V Li-Ion cell battery type is suited for supplying the power
to the Telit GC864-QUAD V2 / GC864-DUAL V2 module.
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 GC864-QUAD V2 / GC864-DUAL V2 and damage it.
BE USED DIRECTLY since their maximum voltage can rise over the absolute
maximum voltage for the GC864-QUAD V2 / GC864-DUAL V2 and damage it.
CAUTION:
DO NOT USE any Ni-Cd, Ni-MH, and Pb battery types directly connected with GC864-
QUAD V2 / GC864-DUAL V2. Their use can lead to overvoltage on the GC864-QUAD V2
/ GC864-DUAL V2 and damage it. USE ONLY Li-Ion battery types.
QUAD V2 / GC864-DUAL V2. Their use can lead to overvoltage on the GC864-QUAD V2
/ GC864-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.
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
GC864-QUAD V2 / GC864-DUAL V2 from power polarity inversion. Otherwise the
battery connector must be done in a way to avoid polarity inversions when connecting
the battery.
GC864-QUAD V2 / GC864-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.
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:
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
• Average current during idle (Power Saving disabled): 19mA