ICS1722ST datasheet(8/24 Pages) GALAXY

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ICS1722

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.

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.

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.

Charge Rate

Fast Charge Timer Cutoff

Maintenance Timer Cutoff

(after fast charge termination)

Charge Time Limit

(from reset)

4 C

0.3 hrs

9.7 hrs

10 hrs

2 C

0.6 hrs

9.4 hrs

10 hrs

1.3 C

0.9 hrs

9.1 hrs

10 hrs

1 C

1.2 hrs

8.8 hrs

10 hrs

C/1.5

1.8 hrs

8.2 hrs

10 hrs

C/2

2.4 hrs

7.6 hrs

10 hrs

C/2.5

3.5 hrs

6.5 hrs

10 hrs

C/3

4.0 hrs

6.0 hrs

10 hrs

C/4

4.6 hrs

5.4 hrs

10 hrs

Table 1: Ten Hour Timer Information

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