ICS1722
Table 3: Charge Rate List
SEL0
SEL1
Charge Rate
Topping Charge
pulse Rate
Maintenance Charge Pulse
Fast Charge Timer
Duration (after reset)
Rate
4C (15 min)
2C (30 min)
1.3C (45 min)
1C (60 min)
C/1.5 (90 min)
C/2 (120 min)
C/2.5 (150 min)
C/3 (180 min)
C/4 (240 min)
one every 40 sec
one every 160 sec
L
L
L
H
H
H
Z
Z
Z
L
H
Z
L
Z
H
L
Z
H
21 min
39 min
57 min
one every 20 sec
one every 13 sec
one every 10 sec
one every 7 sec
one every 5 sec
one every 4 sec
one every 3 sec
one every 2 sec
one every 80 sec
one every 53 sec
one every 40 sec
one every 27 sec
one every 20 sec
one every 16 sec
one every 13 sec
one every 10 sec
75 min
110 min
144 min
212 min
244 min
275 min
See the section on Controller Operation for additional information on the topping charge and maintenance charge. See the section on Charge Termination
Methods for additional information on the charge timer.
When a high level is required, the pin must be tied to VDD. The
Mode Selection: AUX0, AUX1 Pins
The AUX0 and AUX1 inputs must be programmed by the user to
inform the ICS1722 of the desired auxiliary mode. When left
unconnected (open) these tri-level pins will float to about 2.3V.
voltage ranges for low (L), open (Z) and high (H) are listed in
Table 6, DC Characteristics. To program the AUX0 and AUX1
inputs, refer to the Mode Select List in Table 4. See the section on
Auxiliary Modes of Operation for additional information.
When a low level is required, the pin must be grounded.
Table 4: Mode Select List
AUX0
AUX1
Mode Selected
Charging System Test
Direct Maintenance
Fast Charge
Discharge-Only
Discharge-to-Charge
Condition
Mode Operation
Charging system test for embedded applications
L
L
Z
Z
H
H
H
L
H
Z
L
L
Z
H
Indefinite C/40 maintenance charge
Default
Battery discharge to 1V/cell
Battery discharge to 1V/cell followed by the selected charge mode
Timed C/10 topping charge followed by a C/40 maintenance charge
Limits total charge including the maintenance charge to 10 hours
Ten Hour Timer
10
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