BQ2040 ,Multi-Chemistry Smart Battery System (SBS) 1.0 Compliant Gas Gauge With 4 LED DriversNot Recommended For New Designsbq2040Gas Gauge IC With SMBus InterfaceThe bq2040 estimates battery ..
BQ2040SN , Gas Gauge IC With SMBus Interface
BQ2040SN , Gas Gauge IC With SMBus Interface
BQ2040SN , Gas Gauge IC With SMBus Interface
BQ2040SN , Gas Gauge IC With SMBus Interface
BQ2040SN-C408 ,Multi-Chemistry Smart Battery System (SBS) 1.0 Compliant Gas Gauge With 4 LED DriversGeneral Descriptiondischarge based on an internaltimer and temperature sensor and* Provides accurat ..
BUF16821BIPWPR ,16-CH Gamma-Voltage Generator and Vcom Calibrator with Integrated Two-Bank Memory 28-HTSSOP -40 to 85FEATURES DESCRIPTIONThe BUF16821 offers 16 programmable gamma234• 10-BIT RESOLUTIONchannels and two ..
BUF20800 ,18-Channel Gamma Voltage Generator with Two Programmable VCOM ChannelsMAXIMUM RATINGSSupply Voltage, V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..
BUF20800AIDCPR ,18-CH Gamma Voltage Generator with Two Programmable VCOM Channels 38-HTSSOP -40 to 95FEATURES APPLICATIONS 18-CHANNEL GAMMA CORRECTION REPLACES RESISTOR-BASED GAMMA 2-CHANNEL PROGRA ..
BUF20820AIDCPR ,18-Channel Gamma Voltage Generator with Two Programmable Vcom Channels 38-HTSSOP -40 to 85
BUF22821AIDCPR ,22-CH Gamma-Voltage Generator and Vcom Calibrator with Integrated Two-Bank Memory 38-HTSSOP -40 to 95FEATURES PRODUCTOUT2112-Channel Gamma Correction Buffer BUF1280020-Channel Programmable Buffer, 10- ..
BUF410A ,HIGH VOLTAGE FAST-SWITCHING NPN POWER TRANSISTORAPPLICATIONS: 2■ SWITCH MODE POWER SUPPLIES1■ MOT ..
BQ2040-BQ2040SN-C408-BQ2040SN-C408G4-BQ2040SN-C408TR-BQ2040SN-D111-BQ2040SN-D111TR-BQ2040SN-D111TRG4
Multi-Chemistry Smart Battery System (SBS) 1.0 Compliant Gas Gauge With 4 LED Drivers
Features Provides accurate measurement available chargein 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 DescriptionThe bq2040 Gas GaugeIC With
SMBus Interfaceis intended for
battery-packor in-system installa-
tionto maintainan accurate record available battery charge. The
bq2040 directly supports capacity
monitoringfor NiCd, NiMH, andLi-
Ion batterychemistries.
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 canbe directly
indicated usinga four-segment LED
displayto graphically depict battery
full-to-emptyin 25% increments.
The bq2040 estimates battery self-
discharge basedon an internal
timer and temperature sensor and
user-programmable rate informa-
tion storedin external EEPROM.
The bq2040 also automaticallyre-
calibratesor “learns” battery capac-
ityin the full courseofa discharge
cycle fromfullto empty.
The bq2040 may operate directly
from three nickel chemistry cells.
With the REF output andan exter-
nal transistor,a simple, inexpensive
regulator canbe builtto provide
VCC for other battery cell configu-
rations. external EEPROMis usedto
program initial values into the
bq2040 andis necessaryfor proper
operation.
bq2040
Gas Gauge IC With SMBus InterfaceVCC 3.0–6.5V
ESCL EEPROM clock
ESDA EEPROM data
LED1-4 LED segment 1-4
VSS System ground Sense resistor input
DISP Display control input 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 NamesNot Recommended For New Designs
