Rainbow-electronics DS2761 Manual do Utilizador descarregar pdf (Página 4)

DS2761

4 of 24

Table 1. DETAILED PIN DESCRIPTION

SYMBOL DESCRIPTION

Charge Protection Control Output. Controls an external P-channel high-side charge

protection FET.

Discharge Protection Control Output. Controls an external P-channel high-side

discharge protection FET.

Data Input/Out. 1-Wire data line. Open-drain output driver. Connect this pin to the

DATA terminal of the battery pack. Pin has an internal 1mA pulldown for sensing

disconnection.

PIO

Programmable I/O Pin. Used to control and monitor user-defined external circuitry.

Open drain to V

PLS

Battery Pack Positive Terminal Input. The DS2761 monitors the pack plus terminal

through PLS to detect overcurrent and overload conditions, as well as the presence of a

charge source. Additionally, a charge path to recover a deeply depleted cell is provided

from PLS to V

. In sleep mode (with SWEN = 0), any capacitance or voltage source

connected to PLS is discharged internally to V

through 200µA (nominal) to assure

reliable detection of a valid charge source. For details of other internal connections to

PLS and associated conditions see the Li+ Protection Circuitry section.

Power Switch Sense Input. The device wakes up from sleep mode when it senses the

closure of a switch to V

on this pin. Pin has an internal 1mA pullup to V

Voltage Sense Input. The voltage of the Li+ cell is monitored through this input pin.

This pin has a weak pullup to V

Power-Supply Input. Connect to the positive terminal of the Li+ cell through a

decoupling network.

Device Ground. Connect directly to the negative terminal of the Li+ cell. For the

external sense resistor configuration, connect the sense resistor between V

and SNS.

SNS Sense Resistor Connection. Connect to the negative terminal of the battery pack. In the

internal sense resistor configuration, the sense resistor is connected between V

and

SNS.

IS1

Current-Sense Input. This pin is internally connected to V

through a 4.7kW resistor.

Connect a 0.1m F capacitor between IS1 and IS2 to complete a lowpass input filter.

IS2

Current-Sense Input. This pin is internally connected to SNS through a 4.7kW resistor.

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