CS1702 datasheet(10/28 Pages) ETC

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ICS1702

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

OTN indicator is not activated. The system test mode is entered by

placing both the AUX0 and AUX1 pins low (L). The ICS1702

shuts down after the test sequence is finished and a master reset

must be performed to reactivate the device.

Cold Battery Charging

Cold battery charging is activated if a voltage at the THERM pin is

in the cold battery voltage range, as shown in Figure 9. The

ICS1702 checks for a cold battery before initiating fast charge. If a

cold battery is present before fast charge begins, the ICS1702

begins a two-hour C/10 topping charge (the pulsed duty cycle is

based on the selected charge rate). If the battery is still cold after

the two hour topping charge is complete, the ICS1702 begins a

C/40 maintenance charge. The maintenance charge will continue

for as long as the battery remains cold Unless the ten hour time

mode is selected. The thermistor voltage at the THERM pin is

checked every second to see if the battery has warmed up. If so, the

ICS1702 stops the topping or maintenance charge and begins a fast

charge at a rate selected by the SEL0 and SEL1 inputs. A cold

battery does not interfere with the condition mode, direct

maintenance mode, the discharge portion of the discharge-to-

charge mode, or the discharge-only mode as programmed by the

AUX0 and AUX1 pins. See the section on Temperature Sensing,

for more information.

The MMN and OTN indicators will be active, indicating that a low

current charge is being applied to a battery that is outside the

specified temperature range for fast charging. If the CMN and

OTN indicators are active see the Application Information section.

Direct Maintenance Mode

The ICS1702 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 ICS1702 will enter the polling detect

mode. The ICS1702 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 ICS1702 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 4 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 ICS1702 enters the polling detect mode if the battery is

removed.

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 2

Table 2: Ten Hour Timer Information

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

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