ICS1702N datasheet(22/28 Pages) ETC

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ICS1702

Charging System Status by Indicator

The Indicator Description List in Table 3 contains displays that are

caused by charging system abnormalities. When the CMN

indicator is flashing with no other indicator active, there is voltage

present at the battery terminals with the current source off and no

battery. Check the current source and ensure that it produces no

more than the equivalent of 350mV/cell when turned off with no

battery. If the VIN divider resistors were not properly selected, an

open circuit voltage that is actually less than the equivalent of

350mV/cell with the charger off and no battery will not divide

down this open circuit voltage properly and produce the CMN

flash indication. Check the VIN divider and ensure that it properly

normalizes the battery voltage to the electrochemical potential of

about 1.2V cell. If the CMN flash indication occurs with the

battery installed, then the constant current source is producing

more than the equivalent of 350mV/cell when off and there is an

open connection between the charger terminals and the battery.

Check wires, connections, battery terminals, and the battery itself

for an open circuit condition.

If the CMN and OTN indicators are active together, this is an

indication that the battery temperature has dropped to below 10

°C

after a fast charge was initiated with the battery temperature

normal. If this condition is observed and the battery temperature

did not drop after high charge was initiated, check the thermistor

circuit mechanically for poor contact and electrically for excessive

noise.

If the MMN and CMN indicators are alternately flashing, the likely

cause is no battery with the ICS1702 programmed in the

discharge-to-charge auxiliary mode. If the battery is present, check

wires, connectors, battery terminals, and the battery itself for an

open circuit condition.

If the MMN indicator is flashing with the OTN indicator active,

this is an indication that the battery is cold while in either the

discharge portion of the discharge-to-charge mode or the discharge

only mode. When in the discharge-to-charge mode, if the battery

does not warm-up into the normal temperature range after the

discharge is complete, the ICS1702 will enter the maintenance

charge stage. When the battery warms-up, the discharge-to-charge

mode will repeat.

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