Rainbow Electronics DS2761 - Manual (Page 4)

DS2761
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Table 1. DETAILED PIN DESCRIPTION
SYMBOL DESCRIPTION
CC
Charge Protection Control Output. Controls an external P-channel high-side charge
protection FET.
DC
Discharge Protection Control Output. Controls an external P-channel high-side
discharge protection FET.
DQ 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 1
mA pulldown for sensing
disconnection.
PIO Programmable I/O Pin. Used to control and monitor user-defined external circuitry.
Open drain to V
SS
.
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
DD
. In sleep mode (with SWEN = 0), any capacitance or voltage source
connected to PLS is discharged internally to V
SS
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.
PS
Power Switch Sense Input. The device wakes up from sleep mode when it senses the
closure of a switch to V
SS
on this pin. Pin has an internal 1 mA pullup to V
DD
.
V
IN
Voltage Sense Input. The voltage of the Li+ cell is monitored through this input pin.
This pin has a weak pullup to V
DD
.
V
DD
Power-Supply Input. Connect to the positive terminal of the Li+ cell through a
decoupling network.
V
SS
Device Ground. Connect directly to the negative terminal of the Li+ cell. For the
external sense resistor configuration, connect the sense resistor between V
SS
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
SS
and
SNS.
IS1 Current-Sense Input. This pin is internally connected to V
SS
through a 4.7k W resistor.
Connect a 0.1 mF capacitor between IS1 and IS2 to complete a lowpass input filter.
IS2 Current-Sense Input. This pin is internally connected to SNS through a 4.7k W resistor.