2.3 Signal Descriptions
2.3.1 Power Supply
Power is provided to the LUM850T / LUM900T through Power pins
that range from 3.0V to 3.6V.
In case of the VCC is +3.3V
Peak – The highest averaged current value over any 100‐microsecond period
Normal – The highest averaged current value over any 1‐second period
Note: For Peak, the value of "100‐microsecond period" was derived as follows:
The period of time that the current is to be measured and averaged over
must be less than a single
GPRS slot time. This enables measurement of the average peak current
within a single GPRS slot.
There are 4.6 milliseconds/GPRS frame and eight slots per GPRS frame =
The 100‐microsecond period < 575‐microsecond period.
2.3.2 USB Interface
The USB interface is compliant with the High Speed USB 2.0
The USB interface is powered directly from host interface 3.3Vaux
LG Electronics Confidential