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ICS1722 Datasheet(PDF) 9 Page - Galaxy Power, Inc. |
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ICS1722 Datasheet(HTML) 9 Page - Galaxy Power, Inc. |
9 / 24 page 9 ICS1722 Pin Descriptions The ICS1722 requires some external components to control the clock rate 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. If the auxiliary discharge-to-charge mode is selected, the power dissipation of the load resistor must be properly selected to accept the extended length of the discharge pulse. Indicators: CMN, MMN, PFN 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 mode as shown in Table 2. The charge mode (CMN) indicator is activated continuously during the soft start and fast charge stages. When the controller enters the topping charge stage, the output goes high and the indicator turns off. The maintenance mode (MMN) indicator is on when the ICS1722 is either in the topping charge, maintenance charge, direct maintenance mode, or the condition mode. The maintenance mode indicator flashes at a one second rate when the ICS1702 is controlling the discharge portion of the discharge-to-charge or the discharge-only mode. The polling detect (PFN) indicator is on when the ICS1722 polls for a battery. 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. Charge Rate Selection: SEL0, SEL1 Pins The SEL0 and SEL1 inputs must be programmed by the user to inform the ICS1722 of the desired charge rate. When left unconnected (open), these tri-level pins will float to about 2.3V. When a low level is required, the pin must be grounded. When a high level is required, the pin must be tied to VDD. The voltage ranges for low (L), open (Z) and high (H) are listed in Table 6, DC Characteristics. To program the SEL0 and SEL1 inputs, refer to the Charge Rate List in Table 3. The ICS1722 does not control the current flowing into the battery in any way other than turning it on and off. The required current for the selected charge rate must be provided by the user’s power source. The external charging circuitry should provide current at the selected charge rate. For example, to charge a 1.2 ampere hour battery in 30 minutes (2C), approximately 2.4 amperes of current is required. Table 2: Indicator Description List PFN MMN CMN Description On Polling mode or battery fault On Maintenance or topping charge, direct maintenance or condition mode On Fast charge Flash Discharge portion of the discharge-to-charge or discharge-only mode Flash See Applications Information Flash Flash See Applications Information On Fast Charge (See Applications Information) |
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