DS2784 datasheet(9/43 Pages) MAXIM

Part #	DS2784

Description	1-Cell Stand-Alone Fuel Gauge IC with Li Protector and SHA-1

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Manufacturer	MAXIM [Maxim Integrated Products]

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DS2784: 1-Cell Stand-Alone Fuel Gauge IC with Li+ Protector and SHA-1 Authentication

TYPICAL OPERATING CIRCUIT

PIN DESCRIPTION

NAME

FUNCTION

1

VDD

Power-Supply Input. Chip supply input. Bypass with 0.1µF to VSS.

2

CTG

Connect to Ground

3

VSS

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

4

VIN

Battery Voltage-Sense Input. Connect to positive cell terminal through decoupling

network.

5, 9, 10

N.C.

No Connection

6

PLS

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

overcurrent, and charge overcurrent conditions.

7

CC

Charge Control. Charge FET control output.

8

DC

Discharge Control. Discharge FET control output.

11

DQ

Data Input/Output. Serial data I/O, includes weak pulldown to detect battery disconnect

and can be configured as wake input.

12

SNS

Sense Resistor Connection. Pack minus terminal and pack-side sense resistor sense

input.

13

CP

Charge Pump Output. Bypass with 0.1µF to VSS.

14

PIO

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

—

EP

Exposed Pad. Connect to VSS or leave unconnected.

DETAILED DESCRIPTION

The DS2784 functions as an accurate fuel gauge, Li+ protector, and SHA-1-based authentication token. The fuel

gauge provides accurate estimates of remaining capacity and reports timely voltage, temperature, and current-

measurement data. Capacity estimates are calculated from a piecewise-linear model of the battery performance

over load and temperature, and system parameters for full and empty conditions. The algorithm parameters are

user programmable and can be modified in pack. Critical capacity and aging data are periodically saved to

EEPROM in case of loss of power due to a short circuit or deep depletion.

The Li+ protection function ensures safe, high-performance operation. nFET protection switches are driven with a

9V charge pump that increase gate drive as the cell voltage decreases. The high-side topology preserves the

ground path for serial communication while eliminating the parasitic charge path formed when the fuel gauge IC is

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