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ICS1712ST Datasheet(PDF) 8 Page - Galaxy Power, Inc. |
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ICS1712ST Datasheet(HTML) 8 Page - Galaxy Power, Inc. |
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8 / 28 page  8 ICS1712 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 3 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 is 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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