PS200 OVERVIEW
The PS200 is a configurable Switch mode charger which is comprised of a PIC16F microcontroller core and precision analog circuitry. This section explores the hardware features in relation to generic Switch mode charging. Subsequent sections will describe the operation of the PS200 with firmware for Lithium-based (Section 2.0 “Lithium Chemistry Algorithm”), Nickel-based (Section 3.0 “Nickel Chemistry Algorithm”) and Lead Acid (Section 4.0 “Lead Acid Chemistry Algorithm”) charging.

• Oscillator
• Power-saving Sleep mode
• Power-on Reset (POR)
• Brown-out Reset (BOR)
• High-Endurance Flash/EEPROM Cell:
   - 100,000 write Flash endurance
   - 1,000,000 write EEPROM endurance
   - Flash/Data EEPROM retention: > 40 years
• High-Speed Comparator module with:
   - Two independent analog comparators
• Operational Amplifier module with two
   independent op amps
• Two-Phase Asynchronous Feedback PWM
• Voltage Regulator
• 10-bit (9-bit plus sign) A/D Converter
• In-Circuit Serial Programming™ (ICSP™) via
   two pins

Features
• User configurable battery charger.
• Firmware available for the following cell
   chemistries:
   - Lithium Ion/Polymer (available now)
   - NiMH, NiCd (available Q2 2005)
   - Pb Acid (available Q3 2005)
• 10-bit ADC for voltage, current and temperature
   measurement:
   - Accurate Voltage Regulation (+/-1%)
   - Accurate Current Regulation (+/-5%)
• Maximum integration for optimal size:
   - Integrated voltage regulator
   - Internal 8 MHz clock oscillator
   - High-Frequency Switch mode charging –
   configurable switching frequency up to 1 MHz
• 256 bytes EEPROM storage for charging
   parameters
• Switch mode charger supports buck and
   synchronous buck topologies
• Configurable charge status display via two LEDs
• Power-on Reset (POR)
• Brown-out Reset (BOR)
• Power-saving Sleep mode

Applications
• Notebook Computers
• Personal Data Assistants
• Cellular Telephones
• Digital Still Cameras
• Camcorders
• Portable Audio Products
• Bluetooth® Devices
• Flashlights
• Power Tools