Gemalto M2M GmbH XT55 사용자 설명서
XT55/56 Hardware Interface Description
Confidential / Preliminary
Confidential / Preliminary
s
XT55/56_hd_v02.96
Page 91 of 125
18.08.2005
Table 27: Electrical description of application interface
Function
Signal name
IO Signal form and level
Comments
GSM_BATT+ I
V
I
= 3.3V to 4.8V
V
I
norm = 4.2V
Inorm ≈ 1.6A (during Tx burst)
Imax< 2A
Imax< 2A
GSM power
supply
supply
GND
1 Tx, peak current 577µs every 4.616ms
2 Tx, peak current 1154µs every
4.616ms
2 Tx, peak current 1154µs every
4.616ms
Power supply input.
5 GSM_BATT+ pins to be
connected in parallel. 5 GND
pins to be connected in
parallel.
The power supply must be
able to meet the
requirements of current
consumption in a Tx burst
(up to 3A).
Sending with two timeslots
doubles the duration of
current pulses to 1154µs
(every 4.616ms)!
5 GSM_BATT+ pins to be
connected in parallel. 5 GND
pins to be connected in
parallel.
The power supply must be
able to meet the
requirements of current
consumption in a Tx burst
(up to 3A).
Sending with two timeslots
doubles the duration of
current pulses to 1154µs
(every 4.616ms)!
GSM_POWER I
V
I
min = 3.0V
V
I
max = 15V
This line signalizes to the
processor that the charger is
connected.
If unused keep pin open.
processor that the charger is
connected.
If unused keep pin open.
GSM_BATT_TEM
P
P
I
Connect NTC with R
NTC
≈ 10k
Ω @ 25°C
to ground.
Input to measure the battery
temperature over NTC
resistor.
NTC should be installed
inside or near battery pack to
enable the charging
algorithm and deliver
temperature values.
If unused keep pin open.
temperature over NTC
resistor.
NTC should be installed
inside or near battery pack to
enable the charging
algorithm and deliver
temperature values.
If unused keep pin open.
Charge
interface
interface
GSM_CHARGE O
I
GSM_CHARGE
= -300µA ... -600µA
@ 3V < V
GSM_CHARGE
< V
LOAD
This line is a current source
for the charge FET with a
10k
for the charge FET with a
10k
Ω resistance between
gate and source.
If unused keep pin open.
If unused keep pin open.
External
supply
voltage
GSM_VDD O
GSM_VDDmin = 2.84V,
GSM_VDDmax = 2.96V
Imax = -10mA
C
GSM_VDDmax = 2.96V
Imax = -10mA
C
L
max = 1µF
Supply voltage, e.g. for an
external LED or level shifter.
The external digital logic
must not cause any spikes or
glitches on voltage
GSM_VDD.
Not available in POWER
DOWN mode.
GSM_VDD signalizes the
“ON” state of the module.
If unused GSM_VDD keep
pin open.
external LED or level shifter.
The external digital logic
must not cause any spikes or
glitches on voltage
GSM_VDD.
Not available in POWER
DOWN mode.
GSM_VDD signalizes the
“ON” state of the module.
If unused GSM_VDD keep
pin open.
VDD Low
Power
GSM_VDDLP I/O
R
I
=1k
Ω
V
O
max ≈ 4.0V (output)
V
I
min = 2.2V, V
I
max = 5.5V (input)
I
I
typ = 10µA at GSM_BATT+ = 0V
Mobile in POWER DOWN mode:
V
V
I
min = 1.2V
Supplies the RTC with power
via an external capacitor or
buffer battery if no V
via an external capacitor or
buffer battery if no V
GSM_BATT+
is applied.
If unused keep pin open.
If unused keep pin open.