DS2714 データシートの表示（PDF） - Maxim Integrated

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DS2714

Quad Loose Cell NiMH Charger

Maxim Integrated 

Figure 2. State Diagram

POR

Standby power

CCx = Hi-Z

LEDx = Hi-Z

VDD > 4.0V

DS2714: Quad Loose Cell NiMH Charger

Presence

TEST

CCx = Hi-Z

LEDx = No Battery

VBAT > 1.65V

OR

T < 0C

OR

T > 45C

t < PCTimeout

OR

PreCHG

CCx = Active 6.25%

VBAT < 1.65V

VBAT > 1.75V

VOFF < 1V

LEDx = Charging

VOFF > 1.65V

t > PCTimeout

VOFF > 1V

AND

OR

T > 50

OR

VON > 1.75V

FAULT

Standby power

CCx = Hi-Z

LEDx = Fault

t < PCTimeout

AND

T < 50C

Cell Test

CCx = Hi-Z

LEDx = Charging

FAIL:

VON > 1.75V

(asynchronously

from anywhere)

VON-VOFF > VCTST

PASS

16 clock

VON > 1.75V

t < Fast Timeout

interval

Fast

CHG

CCx = Active 23.4%

LEDx = Charging

-DV detect

OR

t > Fast Timeout

T > 50

t < Topoff Timeout

Topoff

CHG

CCx = Active 6.25%

LEDx = Charging

T > 50

OR

t > Topoff Timeout

MAINT

CCx = Active 1/128

LEDx = Maintenance

NOTE: VBAT = cell voltage not in charge state .

V OFF = open circuit cell voltage .

V ON = closed circuit cell voltage .

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