DS2711/DS2712: Loose-Cell NiMH Chargers

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PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

Charge Timer Accuracy

-5

+5

%

Charge Timer Range

0.5

10

Hours

ELECTRICAL CHARACTERISTICS: TIMING (continued)

(4.0V

≤ V

Note 1:

Note 2:

Note 3:

When operating in two-cell-series charge configuration, the DMSEL pin must have less than 50pF of external load capacitance for

Note 4:

Note 5:

Note 6:

Note 7:

Note 8:

Figure 1. Block Diagram

State Machine

Voltage

and

Temperature

Measurement

Charge

Timer

BIAS

VP1

CC2

LED1

TMR

VDD

VSS

LED2

VP2

THM1

THM2

Cell

Test

CTST

CC1

CSOUT

0.125V

DMSEL

SUSPEND

3.7V

UVLO

Oscillator

+

-

VN0

Presence Test

Pre-Charge

Fast Charge

&

Cell Tests

Top-Off Charge

Maintenance Charge

Charge

Mode

Select

VN1

0.1V

DS2712

DS2711