The PS200 is a configurable switching charger that consists of a PIC16F microcontroller and precise analog circuits. This section describes the hardware features of the PS200 compared to conventional switching chargers. The following sections describe the charging operation of the PS200, which selects the appropriate firmware based on the battery type. The charging operation is different for different firmware: lithium batteries - Section 2.0 \"Lithium Chemistry Battery Algorithm\", nickel batteries - Section 3.0 \"Nickel Chemistry Battery Algorithm\" and lead-acid batteries - Section 4.0 \"Lead-Acid Chemistry Battery Algorithm\". . Oscillator. Power-saving sleep mode. Power-on reset (POR). Brown-out reset (BOR). High-endurance Flash/EEPROM battery: - Flash writes up to 100,000 times - EEPROM battery writes up to 1,000,000 times - Flash/Data EEPROM data retention: 40+ years. High-speed comparator module with: - Two independent analog comparators. Operational amplifier module with two independent operational amplifiers. Two-stage asynchronous feedback PWM output. Voltage regulator. 10-bit (9-bit + sign) A/D converter. Internal serial programming (ICSP) via two pins. 1.1 Hardware Features The features of the PS200 are well suited for switch-mode battery charging. Use the functional block diagram of the PS200 device with the switch-mode charger example (Figure 2-3, page 12) (Figure 1-1). . Current/Voltage Measurement Module - The current/voltage measurement module consists of a 10-bit A/D converter, several operational amplifiers, and a comparator. The output signal of this module goes into the charge control module. See Figure 1-1. The input pins of this module are connected as shown in Figure 2-3. The input signals are as follows: - LOOPFBK - connected to the comparator - LOOPIN - connected to the operational amplifier and A/D converter - CTRLIN - connected to the operational amplifier - IFBINB - connected to the operational amplifier - IFBINA - connected to the operational amplifier - BATID - connected to the A/D converter - TEMP - connected to the A/D converter - CHGFBK - connected to the comparator
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