DS2715 Dallas Semiconducotr, DS2715 Datasheet - Page 6

• Manufacturer Part Number: DS2715
• Description: NiMH Battery Pack Charge Controller
• Manufacturer: Dallas Semiconducotr

Figure 2. STATE DIAGRAM
Discharge
Mode
LEDs = OFF
Vch = LOW
Pwr=Low
Reset
Latch
Discharge latch set
Discharge latch set
Discharge
Still Set?
t < Fast Timeout
t < Topoff Timeout
Latch
V
(asynchronously from
anywhere)
DD
t < PCTimeout
Vbatt < 1V
< V
AND
UVLO
-V
UVLO-HYS
Check Rt, set mode
Standby power
t > Fast Timeout
CHARGE
CHARGE
Reset
LEDx = Hi-Z
Vch = Hi-Z
LED1 = Charging
LED1 = Charging
Vref = 0.121V
Topoff
dT/dt OR
Vref= 0033V
Fast
T < PCTimeout
30 min PCtimeout
PreCHG
LED1 = Charging
Vref = 0.033V
DS2715 State Diagram
Vbatt>1V
Vbatt > 1.65
T < 50C
Discharge latch set
AND
AND
Vbatt>1.65
Overtemp, Overvoltage Detect
6 of 12
V
DD
> V
t > Topoff Timeout
t > PCTimeout
UVLO
Vbatt < 1.55V
0C < T < 45C
T > 50
T > 50
OR
AND
OR
4 Sec
Delay
LED Hi-Z= No Battery
Presence
TEST
Vch = Hi-Z
Flash until Vbatt>1.65
FAULT
LED2 = DONE
Vbatt > 1.65V
LED2 = Fault
DONE
Vch = Hi-Z
Vch = Hi-Z
T > 50
T > 45C
T < 0C
OR
OR
Vbatt > 1.65
Discharge
Latch Set
Vbatt > 1.65
Vbatt < 1.0
or