DS2778G+TR datasheet(7/45 Pages) MAXIM

Part #	DS2778G+TR

Description	2-Cell, Stand-Alone, Li Fuel-Gauge IC with Protector and Optional SHA-1 Authentication

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Manufacturer	MAXIM [Maxim Integrated Products]

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2-Cell, Stand-Alone, Li+ Fuel-Gauge IC with

Protector and Optional SHA-1 Authentication

_______________________________________________________________________________________

7

CURRENT MEASUREMENT

ACCURACY

VSNS (mV)

0.048

0.028

0.008

-0.012

-0.032

-75

-25

25

75

125

-125

-0.052

+70

°C

-20

°C

+25

°C

IRC vs. VDD

VDD (V)

5

4

3

2

1

2

3

4

5

6

7

0

06

1k

Ω RESISTOR FROM PLS TO PK+

CURRENT MEASUREMENT OFFSET

vs. TEMPERATURE

TEMPERATURE (

°C)

60

40

20

0

-4

-3

-2

-1

0

1

2

-5

-20

Typical Operating Characteristics (continued)

(TA = +25°C, unless otherwise noted.)

Pin Description

NAME

FUNCTION

1

CC

Charge Control. Charge FET control output.

2

VDD

Chip-Supply Input. Bypass with 0.1μF to VSS.

3

DC

Discharge Control. Discharge FET control output.

4

VIN2

Battery Voltage Sense Input 2. Connect to highest voltage potential positive cell terminal through

decoupling network.

5

VIN1

Battery Voltage Sense Input 1. Connect to lowest voltage potential positive cell terminal through

decoupling network.

6

VB

Regulated Operating Voltage. Bypass with 0.1μF to VSS.

7

VSS

Device Ground. Chip ground and battery-side sense resistor input.

8

SNS

Sense Resistor Connection. Pack-side sense resistor sense input.

9

PIO

Programmable I/O. Can be configured as wake input.

10

PLS

Pack Plus Terminal Sense Input. Used to detect the removal of short-circuit, discharge overcurrent, and

charge overcurrent conditions.

11

SDA/DQ

Data Input/Output. Serial data I/O, includes weak pulldown to detect system disconnect and can be

configured as wake input for 1-Wire devices.

12

SCL/OVD

Serial Clock Input/Overdrive Select. Communication clock for 2-wire devices/overdrive select pin for

1-Wire devices.

13

SRC

Protection MOSFET Source Connection. Used as a reference for the charge pump.

14

CP

Charge Pump Output. Generates gate drive voltage for protection FETs. Bypass with 0.47μF to SRC.

—

EP

Exposed Pad. Connect to ground or no connection.

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DS2778G+TR Datasheet(PDF) 7 Page - Maxim Integrated Products

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