Rainbow Electronics DS2712 - Manual (Page 5)

DS2711/DS2712: Loose Cell NiMH Charger
5 of 13
Figure 2. STATE DIAGRAM
POR
Standby power
CCx = Hi-Z
LEDx = Hi-Z
VDD > VPOR (3.7V)
Presence
TEST
CCx = Hi-Z
LEDx = No Battery
VBAT < 1.65V
t < PCTimeout
OR
VBAT < 1V
VBAT > 1.75V
OR
T < 0C
OR
T > 45C
VDD < VPOR -VHYS
(asynchronously from
anywhere)
PreCHG
CCx = Active
12.5% Par., 25% Ser.
LEDx = Charging
FAULT
Standby power
CCx = Hi-Z
LEDx = Fault
FAIL:
VON - VOFF > V
CTST
Cell Test
CCx = Hi-Z
LEDx = Charging
T > 50
Fast
CHG
t < Fast Timeout
Topoff
CHG
t < Topoff Timeout
delta-V detect
OR
t > Fast Timeout
MAINT
CCx = Active 1/64
LEDx = Maintenance
T > 50
OR
t > Topoff Timeout
t > PCTimeout
OR
T > 50
OR
VBAT > 1.75V
VBAT > 1.75V
VBAT > 1.75V
(asynchronously
from anywhere)
PASS
32 clock
interval
VBAT > 1V
AND
t < PCTimeout
AND
T < 50C
CCx = Active
12.5% Par., 25% Ser.
LEDx = Charging
CCx = Active
48% Par., 97% Ser.
LEDx = Charging
VBAT > 1.75V
t < 1s