User's Manual

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Note d’étude / Technical document : URD1– OTL
5665.3 – 003 / 72238 Edition 01
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4.4 NETWORK LED
The HiLoNC V2 module can manage a network LED. The LED can be connected either to one of the available
GPIO or to a PWM (but not the one dedicated to the buzzer).
The transistors can be found a in a single package referenced as UMDXX or PUMDXX Family.
Value of resistor R depends on characteristic of chosen LED; it is used to limit the current through the diode.
Use the AT command to set the GPIO or PWM used to control the LED.
Figure 12: Network LED connection
4.5 POWER SUPPLY
The HiLoNC V2 module can be supplied by a battery or any DC/DC converter compliant with the module supply
range 3.2V to 4.5V and 2.2 A.
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The PCB tracks must be well dimensioned to support 2.2 A maximum current (Burst current 1.8A plus the
extra current for the other used I/Os). The voltage ripple caused by serial resistance of power supply path
(Battery internal resistance, tracks and contact resistance) could result in the voltage drops.
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To prevent any issue in the power up procedure the typical rise time for VBAT should be 1ms.
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The HiLoNC V2 module does not manage the battery charging.
4.5.1 Burst conditions
- Communication mode (worst case: 2 continuous GSM time-slot pulse):
Figure 13: GSM/GPRS Burst Current rush
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A 47µF with Low ESR capacitor is highly recommended for VBAT and close to the module pads 30 & 31.
GPIO or
PWM
HiLoNC V2
VBAT
R