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ICS1712N Datasheet(PDF) 11 Page - Galaxy Power, Inc. |
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ICS1712N Datasheet(HTML) 11 Page - Galaxy Power, Inc. |
11 / 28 page 11 ICS1712 Charge Rate Selection: SEL0, SEL1 Pins The SEL0 and SEL1 inputs must be programmed by the user to inform the ICS1702 of the desired charge rate. When a low level is required, the pin must be grounded. When a high level is required, no connection is required since each pin has an internal 75k Ω pull- up to V DD . The voltage ranges for low (L) and high (H) are listed in Table 8, DC Characteristics. To program the SEL0 and SEL1 inputs, refer to the Charge Rate List in Table 3. The ICS1712 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 3: Charge Rate List SEL0 SEL1 Charge Rate Topping Charge pulse Rate Maintenance Charge Pulse Rate Fast Charge Timer Duration (after reset) L L 4C (15 min) one every 40 sec one every 160 sec 30 min L H 2C (30 min) one every 20 sec one every 80 sec 60 min H L 1C (60 min) one every 10 sec one every 40 sec 90 min H H C/2 (120 min) one every 5 sec one every 20 sec 210 min See the section on Controller Operation for additional information on the topping charge and maintenance charge. See the section on Charge Termination Methods for additional information on the charge timer. |
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