ICS1722
Direct Maintenance Mode
The
ICS1722
can enter directly into the C/40 maintenance mode
for cells that require a maintenance charge only. The direct
maintenance mode is activated by setting the AUX0 pin low (L)
and the AUX1 pin high (H), and resetting the device. The SEL0
and SEL1 pins must be set based on the charging current and the
battery capacity. The formula
Charging Current (Amps)
Battery Capacity (Amp
•
hr)
gives the charge rate. Use Table 4 to find the correct SEL0 and
SEL1 settings. The maintenance charge is applied until the battery
is removed, upon which the
ICS1722
will enter the polling detect
mode. The
ICS1722
will enter the direct maintenance mode upon
initial power-up or after a master reset. The MMN indicator will be
active during this mode.
Ten Hour Timer Mode
Placing the AUX0 and AUX1 pins both high (H) enables a ten
hour timer. This timer limits the total charge, including the
maintenance charge, to approximately ten hours for a battery that is
completely discharged before fast charge is initiated. The ten hour
limit is based on the assumption that the charge terminates due to
the fast charge timer as shown in Table 1.
Charging System Test
The system test mode is intended for use in applications where the
charging system functionality needs to be tested. The system test
sequence consists of a one second activation of the CMN, MMN
and PFN indicator pins as well as the CHG and DCHG lines. The
system test mode is entered by placing both the AUX0 and AUX1
pins low (L). The
ICS1722
shuts down after the test sequence is
finished and a master reset must be performed to reactivate the
device.
Conditioning Mode
The
ICS1722
can enter a conditioning mode which applies a C/10
charge for a timed 10 hour period, followed by an indefinite C/40
maintenance charge until the batteries are removed.
The conditioning mode can be entered by setting the AUX0 pin
high (H) and the AUX1 pin open (Z). The SEL0 and SEL1 pins
must be set based on the charging current and the battery capacity.
The formula
Charging Current (Amps)
Battery Capacity (Amp
•
hr)
gives the charge rate. Use Table 3 to find the correct SEL0 and
SEL1 settings. The MMN indicator will be active during the 10
hour conditioning charge and the maintenance charge that follows.
The
ICS1722
enters the polling detect mode if the battery is
removed.
Table 1: Ten Hour Timer Information
Charge Rate
Fast Charge Timer Cutoff
0.3
0.6
0.9
1.2
1.8
2.4
3.5
4.0
4.6
hrs
hrs
hrs
hrs
hrs
hrs
hrs
hrs
hrs
4C
2C
1.3 C
1C
C/1.5
C/2
C/2.5
C/3
C/4
Maintenance Timer Cutoff
(after fast charge termination)
9.7 hrs
9.4 hrs
9.1 hrs
8.8 hrs
8.2 hrs
7.6 hrs
6.5 hrs
6.0 hrs
5.4 hrs
Charge Time Limit
(from reset)
10 hrs
10 hrs
10 hrs
10 hrs
10 hrs
10 hrs
10 hrs
10 hrs
10 hrs
8
GALAXY [ GALAXY POWER, INC. ]
