ICS1702 datasheet(8/28 Pages) ETC

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ICS1702

If a thermal switch is used, a 45

°C open circuit switch is

recommended. When the thermal switch opens, an internal pull-up

at the THERM pin results in a logic high which shuts down the

controller and activates the OTN indicator. The controller must be

reset once the hot battery fault condition has cleared to restart the

charge sequence.

Maximum temperature termination can be disabled by grounding

the THERM pin. See the section on Temperature Sensing for more

information.

Fast Charge Timer Termination

The controller uses a timer to limit the fast charge duration.

These times are pre-programmed, and are automatically adjusted in

time duration according to the charge rate selected. Fast charge

timer termination is best suited as a safety backup feature to limit

the duration of the fast charge stage. The fast charge timer is

always enabled and cannot be disabled. See Table 4 in the section

Charge Rate Selection for more information.

To determine the required thermistor characteristics for proper

temperature slope termination, the battery temperature rise must be

known or determined for the last minute prior to full charge.

Maximum

temperature

termination

also

enabled

when

temperature slope termination is used. Care must be taken to keep

voltage levels at the THERM pin within the fast charge range

(between 2.4V and 0.93V), as shown in Figure 9.

Maximum Temperature Termination

Maximum temperature can be sensed using either a NTC

thermistor or a thermal switch. Maximum temperature termination

can also be bypassed if desired, although it is strongly

recommended that some form of temperature termination be used.

If an NTC thermistor is used, an internal voltage threshold

determines when the battery is too hot to charge. As temperature

increases, the voltage across the thermistor will drop. This voltage

is continually compared to the internal voltage threshold. If the

thermistor voltage drops below the internal threshold, the OTN

indicator is activated and the controller shuts down. The controller

must be reset once the hot battery fault condition has cleared to

restart the charge sequence.

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