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REV: 021607

Note: Some revisions of this device may incorporate deviations from published specifications known as errata. Multiple revisions of any device

GENERAL DESCRIPTION

The DS2792 provides a user-programmable fuel

gauge solution for Li-Ion and NiMH chemistry battery

packs. A low-power, 16-bit MAXQ20 microcontroller

with generous program and data memory, combined

with an accurate measurement system for battery

current, voltage, and temperature provide the ideal

platform

for

customized

fuel-gauge

algorithms.

EEPROM data memory supports nonvolatile (NV)

in-pack

storage

of

charge

parameters,

cell

characteristics, usage history, and manufacturing/lot

tracking data.

APPLICATIONS

Digital Video Cameras

SLR Digital Still Cameras

Subnotebook PCs and Ultra-Portable PCs

Industrial PDAs, Handheld Computers, and GPS

FUNCTIONAL DIAGRAM

MAXQ is a registered trademark of Maxim Integrated Products,

Inc.

FEATURES

ƒ

Accurate Current Measurement for Coulomb

Counting (Current Accumulation)

1.5% ±4µV Over ±64mV Input Range

1.5% ±267µA Over ±4.2A Range Using an

External 15m

: Series Resistor

ƒ

High-Resolution Current Reporting

12-Bit + Sign Average Every 0.88ms

15-Bit + Sign Average Every 2.8s

ƒ

Three Voltage Measurement Sources

10-Bit Average from VIN1, VIN2–VIN1, and Vx

Inputs

ƒ

Temperature Measurement

10-Bit Using On-Chip Sensor

Ratiometric Input for External Thermistor (Vx)

ƒ

16-Bit MAXQ20 Low-Power Microcontroller

Efficient C-Language Programming

8k Words Total Program Memory:

4k Words EEPROM Program Memory

4k Words ROM Program Memory

64 Words Data EEPROM

256 Words Data RAM

Password-Protected Programming

ƒ

On-Chip, Low Drop-Out Regulator

2.5V to 10V Operating Range

ƒ

SHA-1 Hash Algorithm in ROM

ƒ

19.2kbps UART Interface

ƒ

Internal Oscillator: No Crystal Required

ƒ

Low-Power Consumption

1.5mA CPU Mode (1MHz), 145µA ANALOG

Mode, 50µA SLEEP Mode

ORDERING INFORMATION

PART

TEMP RANGE

PIN-PACKAGE

DS2792G+

-20ºC to +70ºC

TDFN-28

+ Denotes lead-free package.

Contact factory concerning Mask ROM devices.

Pin Configuration appears at end of data sheet.

DS2792

Programmable Fuel Gauge

with UART Interface

www.maxim-ic.com