Hardware Interface Description - KORE Telematics
Hardware Interface Description - KORE Telematics
Hardware Interface Description - KORE Telematics
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XT55/56 <strong>Hardware</strong> <strong>Interface</strong> <strong>Description</strong><br />
Confidential / Released<br />
s<br />
Table 27: Electrical description of application interface<br />
Function Signal name IO Signal form and level Comments<br />
GSM power<br />
supply<br />
GSM_BATT+ I V I = 3.3V to 4.8V<br />
V I norm = 4.2V<br />
Inorm ≈ 1.6A (during Tx burst)<br />
Imax< 2A<br />
GND<br />
1 Tx, peak current 577µs every 4.616ms<br />
2 Tx, peak current 1154µs every<br />
4.616ms<br />
Power supply input.<br />
5 GSM_BATT+ pins to be<br />
connected in parallel. 5 GND<br />
pins to be connected in<br />
parallel.<br />
The power supply must be<br />
able to meet the<br />
requirements of current<br />
consumption in a Tx burst<br />
(up to 3A).<br />
Sending with two timeslots<br />
doubles the duration of<br />
current pulses to 1154µs<br />
(every 4.616ms)!<br />
Charge<br />
interface<br />
GSM_POWER<br />
I<br />
V I min = 3.0V<br />
V I max = 15V<br />
This line signalizes to the<br />
processor that the charger is<br />
connected.<br />
If unused keep pin open.<br />
GSM_BATT_TEM<br />
P<br />
I<br />
Connect NTC with R NTC ≈ 10kΩ @ 25°C<br />
to ground.<br />
Input to measure the battery<br />
temperature over NTC<br />
resistor.<br />
NTC should be installed<br />
inside or near battery pack to<br />
enable the charging<br />
algorithm and deliver<br />
temperature values.<br />
If unused keep pin open.<br />
GSM_CHARGE<br />
O<br />
I GSM_CHARGE = -300µA ... -600µA<br />
@ 3V < V GSM_CHARGE < V LOAD<br />
This line is a current source<br />
for the charge FET with a<br />
10kΩ resistance between<br />
gate and source.<br />
If unused keep pin open.<br />
External<br />
supply<br />
voltage<br />
GSM_VDD<br />
O<br />
GSM_VDDmin = 2.84V,<br />
GSM_VDDmax = 2.96V<br />
Imax = -10mA<br />
C L max = 1µF<br />
Supply voltage, e.g. for an<br />
external LED or level shifter.<br />
The external digital logic<br />
must not cause any spikes or<br />
glitches on voltage<br />
GSM_VDD.<br />
Not available in POWER<br />
DOWN mode.<br />
GSM_VDD signalizes the<br />
“ON” state of the module.<br />
If unused GSM_VDD keep<br />
pin open.<br />
VDD Low<br />
Power<br />
GSM_VDDLP I/O R I =1kΩ<br />
V O max ≈ 4.0V (output)<br />
V I min = 2.2V, V I max = 5.5V (input)<br />
I I typ = 10µA at GSM_BATT+ = 0V<br />
Mobile in POWER DOWN mode:<br />
V I min = 1.2V<br />
Supplies the RTC with power<br />
via an external capacitor or<br />
buffer battery if no V GSM_BATT+<br />
is applied.<br />
If unused keep pin open.<br />
XT55/56_hd_v02.06a Page 90 of 125 17.12.2004
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