DS2790 Datasheet, PDF (1/41 Pages) Maxim Integrated Products – Programmable 1-Cell Li-Ion Fuel Gauge and Protector

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DS2790
Programmable 1-Cell Li-Ion Fuel
Gauge and Protector
GENERAL DESCRIPTION
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 SMBusä-compatible
communication path between the host and battery
pack, while providing password protected
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.
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.
TYPICAL OPERATING CIRCUIT
1nF × 2
PACK+
0.1µF 0.1µF
CC
VIN
DC
PLS
VDD
[P0.0 - P0.5] ⁶
CP
DS2790 ^SCL
AVSS
VSS
SNS1
IS1
SDA
SNS2
IS2
0.1mF
RSNS
150W _CLK
150W _DATA
5.6V 5.6V
(1) (1)
PACK-
2.5V (1)
(1) Optional for 8kV/15kV ESD
PIN CONFIGURATION
See last page for TSSOP and TDFN packages.
FEATURES
§ 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 15mW Series Resistor
§ High Resolution Current Reporting
12-bit + Sign Average Every 0.88ms
15-bit + sign Average Every 2.8s
§ Voltage Measurement
10-bit Average
§ Temperature Measurement
10-bit Using On-Chip Sensor
§ 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
§ State Machine-Driven Protection
Protection Independent of CPU Operation
Programmable Levels for:
- Overvoltage/Undervoltage
- Overcurrent
- Temperature Limits
§ Lithium-Ion Protector Drives Highside N-FETs
§ Industry Standard 400kHz 2-Wire interface
Password Protected Programming
§ Operates as Low as 2.5V Input on VDD
§ SHA-1 Hash Algorithm in ROM
§ Internal Oscillator¾No Crystal Required
§ Low Power Consumption
3.3mA CPU Mode (1MHz), 280µA Analog Mode,
4.5µA Sleep Mode
ORDERING INFORMATION
PART
TEMP RANGE
PIN-PACKAGE
DS2790E+ -20ºC to +70ºC TSSOP-28
DS2790G+ -20ºC to +70ºC TDFN-28
Contact factory concerning Mask ROM devices.
+ Denotes lead-free package.
MAXQ is a registered trademark of Maxim Integrated Products,
Inc.
SMBus is a trademark of Intel Corp.
* I²C is a Philips Corp. trademark. See acknowledgement at the
end of the data sheet.
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.
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REV: 080206