UB2012

Preliminary

LINEAR INTEGRATED CIRCUIT

UNISONICTECHNOLOGIESCO.,LTD

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www.unisonic.com.tw

QW-R121-018 .C

APPLICATION INFORMATION(Cont.)

CHARGE INHIBIT FUNCTION

The TS pin can be used as charge-inhibit input. The user can inhibit charge by connecting the TS pin to VCC or

to pin TS returns the charger to normal operation.

CHARGE STATUS INDICATION

The UTC UB2012 reports the status of the charger on the 3-state STAT pin. The following table summarized the

operation of the STAT pin.

CONDITION

STAT PIN

Battery conditioning and charging

High

Charge complete (Done)

Low

Temperature fault or sleep mode

Hi-Z

The STAT pin can be used to drive a single LED (Figure 1), dual-chip LEDs (Fig. 4) or for interface to a host or

system processor (Fig. 11). When interfacing the UTC UB2012 to a processor, the user can use an output port, as

shown in Figure 11, to recognize the high-Z state of the STAT pin. In this configuration, the user needs to read the

input pin, toggle the output port and read the STAT pin again. In a high-Z condition, the input port always matches

the signal level on the output port.

UTC

UB2012

SNS

BAT

TS

STAT

CC

COMP

OUT

IN

Host

Processor

Figure 9 Interfacing the UTC UB2012 to a Host Processor

LOW-POWER SLEEP MODE