DS2714: Quad Loose Cell NiMH Charger

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EXAMPLE TIMING DIAGRAM FOR THE DS2714

NOTE 1

NOTE 2

12 34 1 2 3 4 12 34 1 2 3 4 12 34 1 2 3 4 12 341 23 41 2 3 41 23 41 2 3 41 23 41 2 3

Cell 1

Cell 2

Cell 3

Cell 4

N

N +1

N +2

N +3

N +4

N +5

N +6

N +7

N +8

N +9

N +10

N +11

Note 1: Cell test time slot for Cell 2.

Note 2: Cell test time slot for Cell 3.

In this timing diagram, the pulses represent charge current into the individual cells. Cell 1 is in Precharge (the timing of Precharge is the same as Top-off). It

gets one charge pulse out of every four available times slots.

Cell 2 is in initially in Fast Charge and it transitions to Topoff charge during the N+7th time interval (Note 1)shown in the diagram.

Cell 3 is in Fast charge. Cell testing is performed during the interval marked Note 2. This cell is not ready to go into Top-off and it resumes Fast charge.

Cell 4 is in maintenance mode, one out of every 32 available time slots gets a charge pulse.