Rainbow-electronics DS2712 User Manual

1 of 13 012005 DESCRIPTION The DS2711 and DS2712 are ideal for in-system or stand-alone charging of 1 or 2 AA or AAA NiMH “loose” cells. Te

DS2711/DS2712: Loose Cell NiMH Charger 10 of 13 Charge Timer The charge timer monitors the duration of charge in fast and top-off charge phases, and

DS2711/DS2712: Loose Cell NiMH Charger 11 of 13 Cell Voltage Monitoring In the 2-cell series mode, the voltage difference between VP2 and VP1 is use

DS2711/DS2712: Loose Cell NiMH Charger 12 of 13 Table 3. CHARGE MODE SELECTION LED2 PIN STRAPPING MODE Low 1-Cell Series Floating 2-Cell Series Hig

DS2711/DS2712: Loose Cell NiMH Charger 13 of 13 Table 4. PARALLEL CONFIGURATION, EACH CELL MODE CURRENT LIMIT 500mA CURRENT LIMIT 1000mA Cell Capa

DS2711/DS2712: Loose Cell NiMH Charger 2 of 13 ABSOLUTE MAXIMUM RATINGS* Voltage on All Pins Relative to VSS -0.3V to +6V Voltage on DMSEL VDD +

DS2711/DS2712: Loose Cell NiMH Charger 3 of 13 PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Threshold Voltage, Thermistor - Min VTHM-MIN (Notes

DS2711/DS2712: Loose Cell NiMH Charger 4 of 13 Note 1: Voltages relative to VSS. Note 2: IMTST current is applied as a source current and as a sink

DS2711/DS2712: Loose Cell NiMH Charger 5 of 13 Figure 2. STATE DIAGRAM PORStandby powerCCx = Hi-Z LEDx = Hi-ZVDD > VPOR (3.7V)PresenceTESTCCx

DS2711/DS2712: Loose Cell NiMH Charger 6 of 13 DETAILED DESCRIPTION Charge Algorithm Overview A charge cycle begins in one of three ways: with the a

DS2711/DS2712: Loose Cell NiMH Charger 7 of 13 Parallel Charge Configuration The parallel configuration supports two slot stand-alone chargers. Char

DS2711/DS2712: Loose Cell NiMH Charger 8 of 13 DS2712 Parallel Charge Configuration with Switch-Mode Charge Current Regulation The example in Figure

DS2711/DS2712: Loose Cell NiMH Charger 9 of 13 Undervoltage Lockout (UVLO) The UVLO circuit serves as a power-up and brownout detector by monitoring