6
LG
Electronics
Confidential
2.3
Signal
Descriptions
2.3.1
Power
Supply
Power
Rail
Voltage
Tolerance
Normal
(max)
Peak
(max)
3.3Vaux
±
9%
TBD
2,750
Power
is
provided
to
the
LUM850T
/
LUM900T
through
Power
pins
that
range
from
3.0V
to
3.6V.
(1)
(1)
(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.
