Details, datasheet, quote on part number: ICS1722S
PartICS1722S
CategoryAnalog & Mixed-Signal Processing => Power
TitlePower
Description16 Pin Quicksaver Charge Controller For Ni-cd & Ni-mh Batteries. Voltage Slope Termination.
CompanyGalaxy Power, Inc.
DatasheetDownload ICS1722S datasheet
  

 

Features, Applications

QuickSaver® Charge Controller for Nickel-Cadmium and Nickel-Metal Hydride Batteries

The is a CMOS device designed for the intelligent charge control of either nickel-cadmium (NiCd) or nickel-metal hydride (NiMH) batteries. The controller uses a pulsed-current charging technique together with voltage slope termination. The ICS1722 employs a four stage charge sequence that provides a complete recharge without overcharging. The controller has nine userselectable charge rates and six user-selectable auxiliary modes available for customized charging systems. The ICS1722 monitors for the presence of a battery and begins charging when a battery is installed. The ICS1722 is for applications where temperature sensing is not required by the charge controller.

Features

Charge termination methods include: Voltage slope Charge timers Four stage charge sequence: Soft start charge Fast charge Topping charge Maintenance charge Reverse-pulse charging available in all charge stages Nine programmable charge rates between 15 minutes (4C) and four hours (C/4) Continuous polling mode for battery detection Six auxiliary modes include: Discharge-before-charge Ten hour C/10 conditioning charge Direct to C/40 maintenance charge Charging system test provided through controller Adjustable open circuit (no battery) voltage reference

Applications

Battery charging systems for: - Portable consumer electronics - Power tools - Audio/video equipment - Communications equipment

RESET OPEN CIRCUIT REFERENCE 0.5V VOLTAGE SENSE MODE SELECT CHARGE SELECT RC RAM ROM OUTPUT CONTROL MICROCODE CONTROL

MAINTENANCE MODE LED CHARGE CONTROL DISCHARGE CONTROL

Active high TTL compatible signal used to turn on an external current source to provide current to charge the battery. Active high TTL compatible signal available to turn on a discharge circuit. Polling detect indicator. An active low turns on an external indicator to show the controller is polling for the presence of the battery. Maintenance mode indicator. An active low turns on an external indicator showing the battery is either in the topping charge, maintenance charge or auxiliary condition mode. The indicator flashes during the auxiliary discharge mode. Charge mode indicator. An active low turns on an external indicator to show the controller is either in a soft start charge or fast charge. Tri-level input used with the SEL1 pin to program the device for the desired charge rate. Ground. Tri-level input used with the SEL0 pin to program the device for the desired charge rate. Master reset signal. A logic low pulse greater than 700 ms initiates a device reset. An external resistor and capacitor sets the frequency of the internal clock. Tri-level input used with the AUX1 pin to program the device for an auxiliary operating mode. Tri-level input used with the AUX0 pin to program the device for an auxiliary operating mode. Open circuit (no battery) voltage reference. An external resistor divider on this pin sets the open circuit voltage reference used to detect the presence of a battery. Battery voltage normalized to one cell with an external resistor divider. Ground. Device supply =+5.0 VDC

Pins 9 and 13 have an internal pull-up. Pins 6,8,11,12 float to 2.3V when unconnected.

The charging sequence consists of four stages. The application of current is shown graphically in Figure 1. The soft start stage gradually increases current levels up to the user selected fast charge rate during the first two minutes. The soft start stage is followed by the fast charge stage, which continues until termination. After termination, a two hour C/10 topping charge is applied. The topping charge is followed a C/40 maintenance charge.

Some batteries may exhibit an unusual high impedance condition while accepting the initial charging current, as shown in Figure 2. Unless dealt with, this high impedance condition can cause a voltage peak at the beginning of the charge cycle that would be misinterpreted as a fully charged battery by the voltage termination methods. The soft start charge eases batteries into the fast charge stage by gradually increasing the current to the selected fast charge rate. The gradual increase in current alleviates the voltage peak. During this stage, only positive current pulses are applied to the battery. The duty cycle of the applied current is increased to the selected fast charge rate, as shown in Figure 3, by extending the current pulse on every cycle until the pulse is about one second in duration. The initial current pulse is approximately 200ms. The CMN indicator is activated continuously during this stage

Figure 1: Graphical representation of average current levels during the four charging stages
Figure 2: High impedance voltage spike at the beginning of charge

 

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ICS1722M
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