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Front Slot Charger
Main Charging
The charging is entirely controlled by the phone, which after being inserted into the
charger slot starts being charged by the MC7000. Any possible charging of a spare
battery in the rear slot is interrupted, and 500 - 700 mA is delivered to the phone
battery.
Note! The phone does not have to be turned On when inserted into the charger slot
due to its auto-turn-on feature.
Trickle Charging
After the main charging the phone automatically returns to normal power distribu-
tion and trickle charging unless a spare battery then is going to be charged. The
power distribution and trickle charging to the phone is in that case inhibited until the
spare battery charging is terminated.
Rear Slot Charger
Main Charging
The 500 - 700 mA charging current to the spare battery is entirely controlled by the
Central Processing Unit. Several algorithms are used to establish when the battery is
fully charged:
• -dv/dt
The battery voltage is sampled once a second for approximately one minute and
the mean value is calculated. The max. mean value is stored and compared with
consecutive values. When a specific divergence is obtained, the charging is ter-
minated.
• peak detect
The charging is terminated when the above mentioned values are less or identical
to the max. mean value for a specific time.
• safety time elapsed (4 hours)
The safety timer is used as a last resort when the above methods fail.
Trickle Charging
When the main charging is completed an 8mA trickle charging generated by short
pulses is automatically initiated, but only in case the front slot is empty.
Discharging
After pressing the discharge button the spare battery is discharged by a 200mA cur-
rent. Charging will commence when the battery voltage has dropped to 4.0V.
Accessories
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