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BQ2040 Datasheet(PDF) 1 Page - Texas Instruments

Part # BQ2040
Description  Gas Gauge IC With SMBus Interface
Download  36 Pages
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

BQ2040 Datasheet(HTML) 1 Page - Texas Instruments

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1
Features
® Provides accurate measurement
of available charge in NiCd,
NiMH, and Li-Ion batteries
® Supports SBS v1.0 data set and
two-wire interface
® Monitors charge FET in Li-Ion
pack protection circuit
® Designed for battery pack inte-
gration
- Low operating current
- Complete circuit can fit on less
than ¾ square inch of PCB
space
® Supports SBS charge control
commands for NiCd, NiMH, and
Li-Ion
® Drives a four-segment LED dis-
play for remaining capacity
indication
® 16-pin narrow SOIC
General Description
The bq2040 Gas Gauge IC With
SMBus Interface is intended for
battery-pack or in-system installa-
tion to maintain an accurate record
of available battery charge. The
bq2040 directly supports capacity
monitoring for NiCd, NiMH, and Li-
Ion battery chemistries.
The bq2040 uses the System Man-
agement Bus v1.0 (SMBus) protocol
and supports the Smart Battery
Data (SBData) commands. The
bq2040 also supports the SBData
charge control functions.
Battery
state-of-charge, remaining capacity,
remaining time, and chemistry are
available over the serial link.
Battery-charge state can be directly
indicated using a four-segment LED
display to graphically depict battery
full-to-empty in 25% increments.
The bq2040 estimates battery self-
discharge based on an internal
timer and temperature sensor and
user-programmable rate informa-
tion stored in external EEPROM.
The bq2040 also automatically re-
calibrates or “learns” battery capac-
ity in the full course of a discharge
cycle from full to empty.
The bq2040 may operate directly
from three nickel chemistry cells.
With the REF output and an exter-
nal transistor, a simple, inexpensive
regulator can be built to provide
VCC for other battery cell configu-
rations.
An external EEPROM is used to
program initial values into the
bq2040 and is necessary for proper
operation.
bq2040
Gas Gauge IC With SMBus Interface
VCC
3.0–6.5V
ESCL
EEPROM clock
ESDA
EEPROM data
LED1-4
LED segment 1-4
VSS
System ground
SR
Sense resistor input
DISP
Display control input
1
PN204001.eps
16-Pin Narrow SOIC
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
VCC
ESCL
ESDA
LED1
LED2
LED3
LED4
VSS
VOUT
REF
SMBC
SMBD
PSTAT
SB
DISP
SR
SB
Battery sense input
PSTAT
Protector status input
SMBD
SMBus data input/output
SMBC
SMBus clock
REF
Voltage reference output
VOUT
EEPROM supply output
SLUS005–JUNE 1999 E
Pin Connections
Pin Names
Not Recommended For New Designs


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