DS2790G

更新时间： 2024-11-01 04:15:15

品牌	Logo	应用领域
美信 - MAXIM		电池仪表
页数	文件大小	规格书
41页	389K
描述
Programmable 1-Cell Li-Ion Fuel Gauge and Protector

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DS2790G 数据手册

DS2790

Programmable 1-Cell Li-Ion Fuel

Gauge and Protector

www.maxim-ic.com

GENERAL DESCRIPTION

FEATURES

The DS2790 provides a complete fuel gauging and

protection solution for single cell Li-Ion 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 fuelgauge algorithms. The 2-wire

interface provides an I²C*- or SMBusꢀ-compatible

communication path between the host and battery

Cꢀ 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 15mꢁ Series Resistor

Cꢀ High Resolution Current Reporting

12-bit + Sign Average Every 0.88ms

15-bit + sign Average Every 2.8s

Cꢀ Voltage Measurement

pack,

while

providing

password

protected

10-bit Average

programming of the fuel-gauging firmware. EEPROM

data memory supports nonvolatile in-pack storage of

charge parameters, cell characteristics, usage

history, and manufacturing/lot tracking data.

Cꢀ Temperature Measurement

10-bit Using On-Chip Sensor

Cꢀ 16-bit MAXQ20 Low Power Microcontroller

Efficient C-Language Programming

8k words Total Program Memory

ꢂꢃ 4k Words EEPROM Program Memory

ꢂꢃ 4k Words ROM Program Memory

64 Words Data EEPROM

An autonomous state machine performs voltage,

current, and temperature related protection functions.

This capability increases reliability of the whole

system by eliminating dependence on the CPU for

protection. The DS2790 supports Li-Ion batteries in a

wide range of applications.

256 Words Data RAM

Cꢀ State Machine-Driven Protection

Protection Independent of CPU Operation

Programmable Levels for:

TYPICAL OPERATING CIRCUIT

ꢂꢃ Overvoltage/Undervoltage

1nF × 2

ꢂꢃ Overcurrent

PACK+

ꢂꢃ Temperature Limits

Cꢀ Lithium-Ion Protector Drives Highside N-FETs

Cꢀ Industry Standard 400kHz 2-Wire interface

Password Protected Programming

Cꢀ Operates as Low as 2.5V Input on VDD

Cꢀ SHA-1 Hash Algorithm in ROM

Cꢀ Internal OscillatorZNo Crystal Required

Cꢀ Low Power Consumption

VIN

VDD

PLS

[P0.0 - P0.5]

150ꢀ

CLK

0.1µF 0.1µF

SCL

DS2790

3.3mA CPU Mode (1MHz), 280µA Analog Mode,

4.5µA Sleep Mode

DATA

SDA

AVSS

VSS

SNS1

SNS2

5.6V 5.6V

(1) (1)

IS1

IS2

ORDERING INFORMATION

0.1ꢁF

PART

TEMP RANGE

-20ºC to +70ºC

PIN-PACKAGE

TSSOP-28

TDFN-28

R_SNS

PACK-

DS2790E+

DS2790G+

2.5V

(1)

(1) Optional for 8kV/15kV ESD

Contact factory concerning Mask ROM devices.

+ Denotes lead-free package.

MAXQ is a registered trademark of Maxim Integrated Products,

Inc.

PIN CONFIGURATION

SMBus is a trademark of Intel Corp.

* I²C is a Philips Corp. trademark. See acknowledgement at the

end of the data sheet.

See last page for TSSOP and TDFN packages.

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

may be simultaneously available through various sales channels. For information about device errata, click here: www.maxim-ic.com/errata.

1 of 41

REV: 080206

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