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ICS1712N Datasheet(PDF) 10 Page - Galaxy Power, Inc. |
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ICS1712N Datasheet(HTML) 10 Page - Galaxy Power, Inc. |
10 / 28 page 10 ICS1712 Pin Descriptions The ICS1712 requires some external components to control the clock rate, sense temperature and provide an indicator display. The controller must be interfaced to an external power source that will provide the current required to charge a battery pack and, if desired, a circuit that will sink discharge current. Output Logic Signals: CHG, DCHG Pins The CHG and DCHG pins are active high, TTL compatible outputs. In addition to being TTL compatible, the CMOS outputs are capable of sourcing current which adds flexibility when interfacing to other circuitry. A logic high on the CHG pin indicates that the charging current supply should be activated. If applicable, a logic high on the DCHG pin indicates that the discharge circuit should be activated. Care must be taken to control wiring resistance and inductance. The load resistor must be capable of handling this short duration high-amplitude pulse. Indicators: CMN, PFN, OTN Pins The controller has three outputs for driving external indicators. These pins are active low. The three indicator outputs have open drains and are designed to be used with LEDs. Each output can sink over 20mA, which requires the use of an external current limiting resistor. The three indicator signals denote fast charge stage, topping and maintenance stages, and the polling detect or battery fault and out-of-temperature range modes as shown in Table 2. The charge mode (CMN) indicator is activated continuously during the soft start and fast charge stages. The CMN indicator flashes at a one-second rate when the ICS1712 is applying a topping or maintenance charge. The polling fault (PFN) indicator is on when the ICS1712 polls for a battery for the first 10 seconds. The controller applies periodic charge pulses to detect the presence of a battery. The indicator is a warning that these charge pulses are appearing at the charging system terminals at regular intervals. When a battery is detected, the indicator is turned off. The indicator is also active if the battery is removed from the system, warning that a fault has occurred. The out-of-temperature range (OTN) indicator is active whenever the voltage at the temperature sense (THERM) input enters a range that indicates that the attached battery is too hot to charge. The OTN indicator is also activated with the CMN indicator if the controller is initialized with the battery in the cold battery charge region. Table 2: Indicator Description List PFN CMN OTN Description On Polling mode or battery fault Flash Maintenance and topping charge On Fast charge On Hot battery shutdown Flash On Cold battery charge On on See Applications Information On One flash See Applications Information |
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Similar Description - ICS1712N |
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