DS2781: Two-Cell Standalone Fuel Gauge IC

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EEPROM RELIABILITY SPECIFICATION

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

EEPROM Copy Time

15

ms

EEPROM Copy Endurance

50,000

cycles

Note 1: All voltages are referenced to VSS.

Note 2: Factory calibrated accuracy. Higher accuracy can be achieved by in-system calibration by the user.

Note 3: Accumulation Bias register set to 00h. Current Offset Bias register set to 00h. NBEN bit = 0.

Note 4: Parameters guaranteed by design.

Note 5: Internal voltage regulator active.

PIN DESCRIPTION

PIN

NAME

FUNCTION

1

VB

Internal Supply. Bypass to VSS with a 0.1µF capacitor.

2

VSS

Device Ground. Connect directly to the negative terminal of the cell stack. Connect the

sense resistor between VSS and SNS.

3

VIN

Voltage Sense Input. The voltage of the battery pack is monitored through this input pin

with respect to the VSS pin.

4

VPLS

Power-Supply Input. Connect to the positive terminal of the battery pack through a

decoupling network.

5

DQ

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

pack disconnection from host or charger.

6

OVD

1-Wire Bus Speed Control. Input logic level selects the speed of the 1-Wire bus. Logic 1

selects overdrive (OVD) and Logic 0 selects standard timing (STD). On a multidrop bus,

all devices must operate at the same speed.

7

SNS

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

Connect the sense resistor between VSS and SNS.

8

PIO

Programmable I/O Pin. Can be configured as input or output to monitor or control user-

defined external circuitry. Output driver is open drain. This pin has an weak internal