ICS1712ST datasheet(10/28 Pages) GALAXY

10 / 28 page

ICS1712

Pin Descriptions

The ICS1712 requires some external components to control the

clock rate, sense temperature and provide an indicator display. The

controller must be interfaced to an external power source that will

provide the current required to charge a battery pack and, if

desired, a circuit that will sink discharge current.

Output Logic Signals: CHG, DCHG Pins

The CHG and DCHG pins are active high, TTL compatible

outputs. In addition to being TTL compatible, the CMOS outputs

are capable of sourcing current which adds flexibility when

interfacing to other circuitry. A logic high on the CHG pin

indicates that the charging current supply should be activated. If

applicable, a logic high on the DCHG pin indicates that the

discharge circuit should be activated.

Care must be taken to control wiring resistance and inductance.

The load resistor must be capable of handling this short duration

high-amplitude pulse.

Indicators: CMN, PFN, OTN Pins

The controller has three outputs for driving external indicators.

These pins are active low. The three indicator outputs have open

drains and are designed to be used with LEDs. Each output can

sink over 20mA, which requires the use of an external current

limiting resistor. The three indicator signals denote fast charge

stage, topping and maintenance stages, and the polling detect or

battery fault and out-of-temperature range modes as shown in

Table 2.

The charge mode (CMN) indicator is activated continuously during

the soft start and fast charge stages. The CMN indicator flashes at a

one-second rate when the ICS1712 is applying a topping or

maintenance charge.

The polling fault (PFN) indicator is on when the ICS1712 polls for

a battery for the first 10 seconds. The controller applies periodic

charge pulses to detect the presence of a battery. The indicator is a

warning that these charge pulses are appearing at the charging

system terminals at regular intervals. When a battery is detected,

the indicator is turned off. The indicator is also active if the battery

is removed from the system, warning that a fault has occurred.

The out-of-temperature range (OTN) indicator is active whenever

the voltage at the temperature sense (THERM) input enters a range

that indicates that the attached battery is too hot to charge. The

OTN indicator is also activated with the CMN indicator if the

controller is initialized with the battery in the cold battery charge

region.

Table 2: Indicator Description List

PFN

CMN

OTN

Description

Polling mode or battery fault

Flash

Maintenance and topping charge

Fast charge

Hot battery shutdown

Flash

Cold battery charge

See Applications Information

One flash

See Applications Information

ICS1712ST データシート(PDF) 10 Page - Galaxy Power, Inc.

ICS1712ST データシート(HTML) 10 Page - Galaxy Power, Inc.

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28

データシートダウンロード