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SM6781BV Datasheet(PDF) 6 Page - Nippon Precision Circuits Inc |
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SM6781BV Datasheet(HTML) 6 Page - Nippon Precision Circuits Inc |
6 / 10 page SM6781BV NIPPON PRECISION CIRCUITS—6 Initialization The SM6781BV charging operation commences when power is applied or when a battery is inserted (standby mode released). Approximately 200ms are required when operation starts to initialize all internal circuits. When initialization finishes, the charging mode is determined by the BATT input voltage and the timer mode. Battery Voltage Check When the BATT input voltage is outside the permitted range, quick charge stops. At this point, the maximum quick charge time count and - ∆V prohibit time counters also stop. When the BATT input voltage comes back within the permitted range, quick charge and timer stop conditions are released. When quick charge mode is restarted, the saved peak voltage data is reset (cleared to 0V). – ∆V Detection Prohibit Time – ∆V detection is not performed for approximately 15 minutes from when quick charge commences (quick charge cumulative time). CHGN Output CHGN becomes high impedance during quick charge. CHGN goes LOW when quick charge mode finishes or when abnormal battery voltage is detected. LEDN Output LEDN is LOW during quick charge (LED is ON), and high impedance after quick charge finishes (LED is OFF). When an abnormal battery voltage is detected before quick charge finishes, a pulse of approximately 1Hz is output (LED flashes). Also, a 1Hz pulse is output when INH is HIGH. Quick Charge Termination Quick charge finishes when either – ∆V voltage is detected or the maximum charging time has elapsed. Figure 1. CHGN state Figure 2. LEDN output Hi-Z Low Stop/Hold/INH=High Quick charge CHGN Hi-Z Low LED OFF Power ON or Standby mode cancel Approximately 200ms Depends on charge mode |
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