User's Manual

URD1 – OTL 5696.1– 022 / 72740 Edition 0.4 HILONC- 3GPS APPLICATION NOTE
: Buzzer connection
3.3.2. Network LED
The HILONC-3GPS module can manage a network LED which can be connected to
2G_RF_IND
.
The transistors can be found in a single package referred to as the UMDXX or PUMDXX Family.
The value of resistor R depends on the characteristics of the LED; its purpose is to limit the current passing
through the diode.
Use the AT command to set the
2G_RF_IND
used to control the LED.
: Network LED connection
3.4. Power Requirements
Input Rating : 3.4V ~ 4.2VDC , 700mA , Operation Temperature : -40
℃
~85
℃
.
The host system must supply 3.4V ~ 4.2Vof power to the VBAT.
Within normal 2G and 3G operational modes, the maximum average current is approximately 1.1A
depending on RF output power. In 2G mode peak current can be as high as 2A under matched antenna
conditions. Peak current could be as high as 1.75A in the case of a mismatched antenna. In 3G mode and
under conditions of antenna mismatch, peak current may increase by up to 700mA.
VBAT traces are required to be as short and as wide as possible.

VBAT ceramic decoupling capacitors of at least 100μF/10V
are required to ensure good RF performance. It
is strongly recommended to place capacitors close to the
module’s
connection pad and connected via low
resistance tracks to VBAT and GND.
 Host power must be capable of sourcing enough current to accommodate maximum power in the event of
2G transmission bursts. This can be done, for example, by adding a large capacitor with a low ESR value.
 PCB tracks must be well dimensioned to support a maximum current of 2.2A. Voltage ripple caused by serial
resistance of the power supply path could result in instances of voltage drop.
The HILONC-3GPS does not support battery charging.
Note d’étude / Technical document :
01/08/20111 - Page 15 / 41