MOST150 E-O Converter
© 2015 - 2017 K2L GmbH & Co. KG
13
DS60001342C
K2L - USER’S GUIDE
3.1 Charger and Battery Operation
An on-board charger circuit is provided, which allows the battery to charge when a DC power supply
is present at the power jack. The charger circuit automatically turns on when a DC power supply is
inserted into the power jack, independent of the power switch. When the fast-charge conditions are
met, the charger circuit begins to fast-charge the battery. Fast-charge is active when the Charger LED
(orange) is on. If the battery reaches a temperature greater than 50 °C the charger circuit exits the
fast-charge cycle. The fast-charge cycle typically lasts 4.5 to 5 hours when the battery is completely
discharged. The end of the fast-charge cycle is indicated by a green Charger LED. Anytime that the
green Charger LED is shown and the DC power supply is connected to the MOST150 E-O Converter,
the charger circuit trickle-charges the battery. Trickle-charge mode helps to maintain a full charge on
the battery without over-charging it. Inserting a DC power supply into a MOST150 E-O Converter with
a full charge on its battery results in a short fast-charge cycle.
Note:
The MOST150 E-O Converter uses four Li-Ion hydride rechargeable batteries, therefore it is
not necessary to fully discharge the battery before they can be recharged.
When the power switch is in the ON position and the DC power supply is connected to the power jack,
the DC power supply powers the board supplies (3.3 V and 1.8 V) for the functional circuitry (data
conversion). Operation of the MOST150 E-O Converter while the battery is charging can be a useful
feature during compliance testing. The MOST150 E-O Converter outside of the test environment can
be powered by a DC power supply, which ensures that its batteries maintain a full charge. When the
batteries of the MOST150 E-O Converter inside of the test environment are low, indicated by the Power
LED (orange) on, the inside and outside MOST150 E-O Converters can be switched to allow the empty
battery to charge while testing continues. Switching the MOST150 E-O Converters in this manner
results in minimal down time, and can easily be done between tests, i.e., do not connect the MOST150
E-O Converter to a power supply in the middle of a test. Once the DC power supply is disconnected,
the charger circuit shuts down. If the power switch is ON when this occurs, the board power supplies
will continue to be powered by the battery. A full battery charge typically provides 10 hours of power
for MOST150 E-O Converter operation. After approximately eight hours, the low battery indicator
Power LED (orange) turns on. This indicates that there are less than two hours of battery life remaining
and that the battery should be recharged.
Note:
To conserve battery charge, the power switch should be turned OFF whenever tests are not
conducted.