I65/I56I HARDWARE DESCRIPTION VERSION
1.00
and prevent the voltage from overshooting beyond 4.2 V. Once the pulse
width reaches the minimum of 100 ms and the duty cycle does not
change for 2 minutes, fast charging is completed.
Fast charging can only be accomplished in a temperature range from 0 °C
to +45 °C.
Figure 9:
Charging process
Note:
Do not connect the charger to the VC+ lines. Only the charger input
of the external charging circuit is intended as input for charging
current! The POWER pin of I56/I56i is the input only for indicating
a connected charger! The battery manufacturer must guarantee that
the battery complies with the described charging technique.
What to do if software controlled charging does not start up?
If trickle charging fails to raise the battery voltage to 3.2 V within 60 minutes
+10 %, processor controlled charging does not begin. To start fast charging you
can do one of the following:
Once the voltage has risen above its minimum of 3 V, you can try to start
software controlled charging by pulling the SOFT_ON line to HIGH.
If the voltage is still below 3 V, driving the SOFT_ON line to HIGH
switches the timer off. Without the timer running, the GSM/GPRS part of
the I56/I56i module will not proceed to software controlled charging. To
restart the timer you are required to shortly disconnect and reconnect the
charger.
5.6.5 Operating modes during charging
Of course, the battery can be charged regardless of the engine’s operating
mode. When the GSM engine is in Normal mode (SLEEP, IDLE, TALK,
GPRS IDLE or GPRS DATA mode), it remains operational while charging is
in progress (provided that sufficient voltage is applied). The charging process
during the Normal mode is referred to as
Charge mode
. If the charger is
connected to the charger input of the external charging circuit and the POWER
pin of module while GSM/GPRS part of I56/I56i is in POWER DOWN mode,
the GSM/GPRS part of the I56/I56i goes into
Charge-only
mode.
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