ICS1702N Galaxy Semi-Conductor Holdings Limited, ICS1702N Datasheet
ICS1702N
Available stocks
Related parts for ICS1702N
ICS1702N Summary of contents
Page 1
QuickSaver® Charge Controller for Nickel-Cadmium and Nickel-Metal Hydride Batteries General Description The ICS1702 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 ...
Page 2
ICS1702 Pin Configuration Pin Definitions Pin Number Pin Name 1 CHG 2 DCHG 3 PFN 4 MMN 5 CMN 6 OTN 7 SEL0 8 VSS 9 AVSS 10 SEL1 11 MRN DTSEL 14 AUX0 15 AUX1 16 ...
Page 3
Controller Operation Charging Stages 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 ...
Page 4
ICS1702 Initial Pulse Width cycle time Figure 3: Cycle-to-cycle increase of the soft-start current pulse widths Fast Charge In the second stage, the ICS1702 applies the charging current in a series of charge and discharge pulses. The technique consists of ...
Page 5
The discharge current pulse amplitude is typically set to about 2.5 times the amplitude of the charging current based on 1.4V/cell. For example, if the charge current is 4 amps, then the discharge current is set at about 10 amps. ...
Page 6
ICS1702 Charge Termination Methods Several charge termination schemes, including voltage slope, temperature slope, maximum temperature and two overall charge timers are available. The voltage slope and negative voltage slope methods may be used with or without the temperature slope and ...
Page 7
Temperature Slope Termination Temperature slope termination is based on the battery producing an accelerated rate of heating as the amount of readily chargeable material dimishes at full charge. An increase in battery (cell) heating due to the charging reaction will ...
Page 8
ICS1702 To determine the required thermistor characteristics for proper temperature slope termination, the battery temperature rise must be known or determined for the last minute prior to full charge. Maximum temperature termination is also enabled when temperature slope termination is ...
Page 9
Battery Detection Upon power-up or after a master reset, excess charge from output filter capacitors at the charging system terminals is removed with a series of discharge pulses. After the discharge pulse sequence is complete, the voltage at VIN must ...
Page 10
ICS1702 Direct Maintenance Mode The ICS1702 can enter directly into the C/40 maintenance mode for cells that require a maintenance charge only. The direct maintenance mode is activated by setting the AUX0 pin low (L) and the AUX1 pin high ...
Page 11
Pin Descriptions The ICS1702 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 ...
Page 12
ICS1702 SEL0 SEL1 Charge Rate 4C (15 min (30 min 1.3C (45 min (60 min C/1.5 (90 min C/2 (120 min C/2.5 (150 min ...
Page 13
Master Reset: MRN Pin The MRN pin is provided to re-program the controller for a new mode or charging sequence. This pin has an internal pull-up of about 75k . A logic low on the MRN pin must be present ...
Page 14
ICS1702 To set the voltage at the THERM pin for 1.67V the equivalent divider looks like Figure 11. Figure 11: Equivalent voltage divider The parallel resistance R is calculated 1.67V R 1.67V/10k The internal ...
Page 15
For example, a battery was monitored as it charged rate ambient. In the final minute of charge, the battery temperature rose from 29 where full charge was detected. With this ...
Page 16
ICS1702 Using no temperature sensor temperature sensor is not used, the THERM pin must be grounded. Termination Selection: DTSEL Pin The ICS1702 has the capability of either temperature slope termination, voltage slope termination or both methods simultaneously. The ...
Page 17
2.2k OPREF = 1.86V R4 = 1.3k Resistor divider at the OPREF pin Figure 14: Open Circuit Reference Example Power: VDD Pin The power supply for the device must be connected to the VDD pin. ...
Page 18
ICS1702 T =25 C. All values given are typical at specified V amb Parameter Supply Voltage Supply Current High Level Input Voltage SEL0, SEL1, AUX0, AUX1 Low Level Input Voltage SEL0, SEL1, AUX0, AUX1 Open Input Voltage SEL0, SEL1, AUX0, ...
Page 19
R 16k , C 100pF PARAMETER Clock Frequency Reset Pulse Duration Charge Pulse Width Discharge Pulse Width Rest Time Data Acquisition Time Cycle Time Capacitor Discharge Pulse Width Capacitor Discharge Pulse Period Polling Detect Pulse Width Polling Detect Pulse Period ...
Page 20
ICS1702 Applications Information To ensure proper operation of the ICS1702, external components must be properly selected. The external current source used must meet several important criteria to ensure optimal performance of the charging system. The charging current should be constant ...
Page 21
Voltage Slope Termination The voltage slope termination method used by the ICS1702 requires a nearly constant current flow into the battery during fast charge. Equipment that draws a known constant current while the battery is charging may use the voltage ...
Page 22
ICS1702 Charging System Status by Indicator The Indicator Description List in Table 3 contains displays that are caused by charging system abnormalities. When the CMN indicator is flashing with no other indicator active, there is voltage present at the battery ...
Page 23
V in CONSTANT CURRENT SOURCE + (note 2) 390 1k 1 CHG (note 3) 2 DCHG POLL 3 PFN MAINT 4 MMN + 5 V CHG 5 CMN TEMP 6 OTN 390 7 SEL0 8 VSS 9 ...
Page 24
... All package dimensions are in inches. 20-Pin SOIC Package (300 mil) 0.130 All package dimensions are in inches. 20-Pin DIP Package (300 mil) Ordering Information ICS1702N, ICS1702M, ICS1702MT Example: ICS 1702 ST Device type: Consists digits or numbers Prefix: ICS = Intelligent Charging Solution standard device 0.016 ...
Page 25
Galaxy Power Incorporated makes no claim about the capability of any particular battery (NiCd or NiMH) to accept a fast charge. GPI strongly recommends that the battery manufacturer be consulted before fast charging. GPI shall be held harmless for any ...
Page 26
ICS1702 NOTES 26 ...
Page 27
NOTES 27 ICS1702 ...
Page 28
ICS1702 GPI Sales Offices Headquarters Galaxy Power, Inc. PO Box 890 2500 Eisenhower Avenue Valley Forge, PA 19482-0890 Phone: 1-610-676-0188 FAX: 1-610-676-0189 Internet: www.galaxypower.com GPI Sales Representative January 19, 1999 28 ...