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

General Description
The ICS1700A is a CMOS device designed for the intelligent charge control of either nickel-cadmium (KiCd) or nickel-metal hydride (NiMH) batteries. The controller uses a pulsed-current charging technique together with voltage slope termination. The ICS1700A employs a four stage charge sequence that provides a complete recharge without overcharging. The controller has four user-selectable charge rates available for customized charging systems. The ICS1700A is a pin-for-pin replacement for the original ICS1700 controller.
The ICS1700A monitors for the presence of a batter}' and begins charging if a battery is installed within the first 10 seconds after a reset. Voltage and temperature are measured to ensure a batter}' is within fast charge conditions before charge is initiated.
Applications
Batter}' charging systems for:
Portable consumer electronics
Powertools
Audio video equipment
Communications equipment
Wireless handsets

Features
• Multiple charge termination methods include:
Voltage slope Maximum temperature Charge timer
• Four stage charge sequence:
Soft start charge Fast charge Topping charge Maintenance charge
• Reverse-pulse charging available in all charge stages
• Four programmable charge rates between 15 minutes (4C) and two hours (C.2)
• (Xu-of-temperature range detection
Hot battery: charger shutdown Cold battery: low current charge
• Ten second polling mode for battery detection
• Battery fault with shutdown protection