Single-Cell NiMH Charger
R
> R
SUSPEND
TMR
SUSPEND
R
TMR
< R
SUSPEND
(ASYNCHRONOUSLY FROM ANYWHERE)
CS = INACTIVE
STATUS = LOW
V
< V
- V
DD
UVLO UHYS
DS2710
(ASYNCHRONOUSLY FROM ANYWHERE)
PRESENCE
V
DD
> V
UVLO
(3.5V)
POR
CS = INACTIVE
STATUS = LOW
CS = INACTIVE
V
CELL
> 1.75V
OR
T < 0°C
OR
T > +45°C
PRECHARGE
CS = ACTIVE 25% DF
STATUS = 1Hz TOGGLE
t < t
PCHG
AND
V
CELL
< V
MAX-OPEN
V
CELL
> 1.75V
V
< 1.0V
CELL
t > t
OR
PCHG
FAULT
T > +50°C
CS = INACTIVE
STATUS = 4Hz TOGGLE
OR
V
> V
MAX
*
CELL
V
CELL
> 1.0V
AND
CELL TEST
t < t
PCHG
AND
CS = INACTIVE
STATUS = HIGH
FAIL: V
> V
MAX-OPEN
CELL
T < +50°C
OR ΔV > CTEST
PASS
V
CELL
> V
MAX
*
31s INTERVAL
FAST-CHARGE
V
CELL
> V
MAX
*
t < FAST TIMEOUT
CS = ACTIVE
STATUS = HIGH
-ΔV DETECT
T > +50°C
t > FAST TIMEOUT
OR
FLAT VOLTAGE DETECT
TOP-OFF
MAINTENANCE
T > +50°C
OR
t > TOP-OFF TIMEOUT
t < TOP-OFF TIMEOUT
CS = ACTIVE 25% DF
STATUS = HIGH
CS = ACTIVE 1.56% DF
STATUS = LOW
*V
MAX
REPRESENTS V
WHEN THE CS OUTPUT IS ACTIVE AND V
WHEN THE CS OUTPUT IS INACTIVE.
MAX-CHARGE
MAX-OPEN
Figure 2. State Diagram
_______________________________________________________________________________________
6
MAXIM [ MAXIM INTEGRATED PRODUCTS ]
