UB2012 Просмотр технического описания (PDF) - Unisonic Technologies

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UB2012

ADVANCED LINEAR CHARGE MANAGEMENT IC FOR SINGLE AND TWO-CELL LITHIUM-ION AND LITHIUM-POLYMER

Unisonic Technologies 

UB2012

LINEAR INTEGRATED CIRCUIT

 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

VSS (or any level outside the V(TS1) to V(TS2) thresholds). Applying a voltage between the V(TS1) and V(TS2) thresholds

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

Battery conditioning and charging

Charge complete (Done)

Temperature fault or sleep mode

STAT PIN

High

Low

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

COMP

BAT

VCC

TS

CC

VSS

STAT

Host

Processor

OUT

IN

Figure 9 Interfacing the UTC UB2012 to a Host Processor

LOW-POWER SLEEP MODE

The UTC UB2012 enters the sleep mode if the VCC falls below the voltage at the BAT input. This feature

prevents draining the battery pack during the absence of VCC.

UNISONIC TECHNOLOGIES CO., LTD

www.unisonic.com.tw

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QW-R121-018 .G

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