DS2715 查看數據表（PDF） - Dallas Semiconductor -> Maxim Integrated

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DS2715

NiMH Battery Pack Charge Controller

Dallas Semiconductor -> Maxim Integrated 

Figure 2. STATE DIAGRAM

DS2715: NiMH Cell Pack Charge Controller

DS2715 State Diagram

VDD < VUVLO-VUVLO-HYS

(asynchronously from

Discharge

Latch Set

anywhere)

Reset

Standby power

Check Rt, set mode

VDD > VUVLO

Presence

TEST

Vch = Hi-Z

Vch = Hi-Z

Latch

Reset

LEDx = Hi-Z

Vbatt>1.65

LED Hi-Z= No Battery

4 Sec

Delay

t < PCTimeout

PreCHG

Vbatt > 1.65V

Discharge

Mode

Pwr=Low

AND

Vbatt < 1V

Vref = 0.033V

LED1 = Charging

30 min PCtimeout

Vbatt < 1.55V

AND

0C < T < 45C

OR

T < 0C

OR

T > 45C

LEDs = OFF

Vch = LOW

Discharge

Latch

Still Set?

t < Fast Timeout

Vbatt>1V

AND

T < PCTimeout

AND

T < 50C

t > PCTimeout

OR

T > 50

FAULT

Vch = Hi-Z

LED2 = Fault

Flash until Vbatt>1.65

Fast

CHARGE

Vref = 0.121V

LED1 = Charging

Overtemp, Overvoltage Detect

Vbatt > 1.65

Discharge latch set

dT/dt OR

t > Fast Timeout

t < Topoff Timeout

Topoff

CHARGE

Vref= 0033V

LED1 = Charging

T > 50

OR

t > Topoff Timeout

T > 50

DONE

Vbatt > 1.65

or

Vbatt < 1.0

Vch = Hi-Z

LED2 = DONE

Discharge latch set

Vbatt > 1.65

Discharge latch set

6 of 12

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