Signal Descriptions - LG LUM850T User Manual

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.
Power
Rail
3.3Vaux
(1) In case of the VCC is +3.3V
Definitions:
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 =
575 microseconds/slot.
The 100‐microsecond period < 575‐microsecond period.
2.3.2 USB Interface
The USB interface is compliant with the High Speed USB 2.0
specifications.
The USB interface is powered directly from host interface 3.3Vaux
supply.
Voltage
Normal (max)
Tolerance
±9%
TBD
LG Electronics Confidential
Peak (max)
(1)
2,750
(1)
6