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ICS1712M Datasheet(PDF) 9 Page - Galaxy Power, Inc. |
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ICS1712M Datasheet(HTML) 9 Page - Galaxy Power, Inc. |
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9 / 28 page  9 ICS1712 Battery Polling Upon power-up or after a reset is issued, any excess charge from filter capacitors at the charging system terminals is removed with a series of discharge pulses. After the discharge pulse series is complete, the voltage at VIN must be greater than 0.5V when a battery is present. If the voltage at VIN is less than 0.5V, the ICS1712 assumes no battery is attached and initiates a polling sequence. The ICS1712 then applies a 100ms charge pulse. During the pulse, the ICS1712 monitors the VIN pin to determine if the divided down terminal voltage is greater than the internal 2.0V reference. If the battery is present, the voltage is clamped below the 2.0V reference when the current pulse is applied and the fast charge stage begins immediately. If a battery is not present, the voltage at VIN rises above the 2.0V reference and the PFN fault indicator is activated. The charge pulses repeat for 10 seconds. If the battery is installed within 10 seconds, the ICS1712 will turn off the PFN fault indicator and enter the soft start stage. If the battery is not installed within 10 seconds, the PFN fault indicator remains active and the ICS1712 shuts down. A reset must be issued to restart the controller after installing the battery. Battery Fault Detection The ICS1712 will turn on the PFN fault indicator and shut down if the battery is removed or if an open circuit occurs in the current path anytime after fast charge has been initiated. When in the topping charge or maintenance charge stages, a charge pulse may not occur for several seconds. During the period between charge pulses, the voltage at VIN should be greater than 0.5V if a battery is attached. If the voltage at VIN is less than 0.5V, the ICS1712 assumes the battery has been removed, a fault condition is indicated by the PFN fault indicator, and the controller shuts down. Cold Battery Charging Cold battery charging is activated if a voltage at the THERM pin is in the cold battery voltage range, as shown in Figure 7. The ICS1712 checks for a cold battery before initiating fast charge. If a cold battery is present before fast charging begins, the ICS1712 begins a two hour C/10 topping charge (the pulsed duty cycle is based on the selected charge rate). If the battery is still cold after the two hour topping charge is complete, the ICS1712 begins a C/40 maintenance charge. The maintenance charge will continue for as long as the battery remains cold. The thermistor voltage at the THERM pin is checked every second to see if the battery has warmed up. If so, the ICS1712 stops the topping charge or maintenance charge and begins a fast charge at a rate selected by the SEL0 and SEL1 inputs. See the section on Temperature Sensing for more information. The CMN will flash at a one second rate, and the OTN indicator will be active, indicating that a low current charge is being applied to a battery that is outside the specified temperature range for fast charging. |
Similar Part No. - ICS1712M |
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Similar Description - ICS1712M |
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