Datasheet

27Maxim Integrated
Dual-Input Linear Chargers, Smart Power Selector
with Advanced Battery Temperature Monitoring
MAX8934A–MAX8934E
Figure 8. Charger State Diagram
STATE DIAGRAM IS FOR 10NC < TEMP < +45NC,
OUTSIDE OF THIS RANGE SEE FIGURE 7
V
BATT
< 2.82V
RESET TIMER
I
CHG
> I
DONE
RESET TIMER
V
BATT
< 4.1V
RESET TIMER
I
CHG
< I
DONE
AND V
BATT
= 4.2V
AND THERMAL
OR OUTPUT LIMIT
NOT EXCEEDED
RESET TIMER
ANY STATE
TIMER > t
PQ
TIMER > 15s (MAX8934A/MAX8934C
/MAX8934E)
TIMER > 60min (MAX8934B/MAX8934D)
V
BATT
< 2.82V,
RESET TIMER
V
BATT
> 3V,
RESET TIMER
V
THM
> V
THM_OT
V
THM
< V
THM_OT
AND NOT CHARGING
(SEE TABLES 2a and 2b)
V
THM_T1
< V
THM
< V
THM_T4
TIMER RESUME
V
THMT1
> V
THM
> V
THMT4
TIMER SUSPEND
(PQ, FC, TOP-OFF)
ANY CHARGING
STATE
OVERTEMP
OT = LOW
UOK OR DOK = LOW
CEN = 0
RESET TIMER
NOT READY
UOK AND DOK = HIGH-Z
CHG = HIGH-Z
FLT = HIGH-Z
DONE = HIGH-Z
I
CHG
= 0mA
PREQUAL
UOK OR DOK = LOW
CHG = LOW
FLT = HIGH-Z
DONE = HIGH-Z
0V P V
BATT
P 3V
I
CHG
= I
CHGMAX
10
FAST-CHARGE
UOK OR DOK = LOW
CHG = LOW
FLT = HIGH-Z
DONE = HIGH-Z
3V P V
BATT
P 4.2V
I
CHG
= I
CHGMAX
TOP-OFF
UOK OR DOK = LOW
CHG = HIGH-Z
FLT = HIGH-Z
DONE = HIGH-Z
BATT = 4.2V
I
CHG
= I
DONE
DONE
UOK OR DOK = LOW
CHG = HIGH-Z
FLT = HIGH-Z
DONE = LOW
4.1V < V
BATT
< 4.2V
I
CHG
= 0mA
TEMPERATURE
SUSPEND
I
CHG
= 0mA
UOK OR DOK = PREVIOUS STATE
CHG = HIGH-Z
FLT = HIGH-Z
DONE = HIGH-Z
CEN = HIGH
OR
REMOVE AND RECONNECT
THE INPUT SOURCE(S)
TOGGLE CEN
OR REMOVE AND RECONNECT
THE INPUT SOURCE(S)
FAULT
UOK AND DOK = LOW
CHG = HIGH-Z
FLT = LOW
DONE = HIGH-Z
I
CHG
= 0mA
TIMER > t
FC
(TIMER SLOWED BY 2X IF
I
CHG
< I
CHGMAX
/2, AND
PAUSED IF I
CHG
< I
CHGMAX
/5
WHILE BATT < 4.2V)