In the GC864 hardware user guide you can read:
Nominal Supply Voltage
Normal operating Voltage Range
3.40 V – 4.20 V
Extended operating Voltage Range
3.22 V – 4.50 V
How can I see from outsite if the module support extended voltage range or not?
What exactly GC864 variant?
v7.02 Max: 4.2V Voltage range: 3.4 – 4.2V v7.03 Max Voltage: 4.5V Voltage range: 3.22 – 4.5V
voltage range (3.22 – 4.5V) represents the maximum and minimum voltages
can be applied to the module without damaging it or causing a shut
down. The hw user guide indicates as Normal Operating range the limits
used for Type Approval (3.4 – 4.2V )
The extended voltage range can be used only with a very stable power
supply taking care of every recommendation and suggestion present in our
HW User guide.
– Below 3.4V: TX output power is decreased, about 2-3dB below
Type Approval requirements, to limit current consumption and prevent
shutdown for low voltage level;
– Above 4.2V: MTBF declared is degraded due to higher heat
generation, considering maximum consumption condition (max power level,
gprs max uplink bandwidth, worst antenna SWR 3:1 mismatch).
– All component inside modem are rated in normal operative
conditions inside 3.25-4.5V range.
Thank you for your replay.
We use the GC864-QUAD V2
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