SS4005G Datasheet, PDF (1/22 Pages) Silicon Standard Corp. – Smart Battery Gas Gauge for e-Bike

SS4005G
Smart Battery Gas Gauge for e-Bike
FEATURES
Provides accurate measurement of available charge Provides cell balance control output for charge
in Li-Ion rechargeable batteries for e-Bike applications.
control.
Supports the 2- wire SMBus v1.1 interface with PEC.
Provides 14-bit resolution for voltage, temperature,
Reports individual cell voltages.
and current measurements
Monitors and provides control to charge and discharge Consumes less than 1.5mW during operation
the MOSFETs used in a Li- Ion protection circuit.
Drives a 4- or 5-segment LED display for indication
of remaining capacity and/or "time to empty"
Pb-free; RoHS-compliant
Narrow (150-mil) SSOP-28 package
GENERAL DESCRIPTION
The SS4005G SBS- compliant gas gauge IC for battery
pack or e-Bike installation maintains an accurate record
record of available charge in rechargeable batteries.
The SS4005G is dedicated for Li- Ion chemistries,
and monitors capacity and other critical battery parameters.
The SS4005G uses an A-to-D converter with automatic
offset error correction for voltage, temperature, and current
reporting.
The cumulated charge into (or discharge from) the
battery is continuously calculated. The onboard ADC also
monitors individual cell voltages in the battery pack and
allows the SS4005G to generate control signals that
may be used in conjunction with a pack supervisor to
enhance pack safety.
The SS4005G supports the smart battery data
(SBData) commands and charge -control functions.
It communicates data using the 2-wire System
management bus (SMBus). The data available includes
the battery’s remaining capacity, temperature, voltage,
current, and remaining run-time predictions.
The SS4005G provides drive pins for LEDs to depict
remaining battery capacity from full to empty in 20% or
25% increments with a 4 or 5-segment display.
The SS4005G works with an external EEPROM. The
EEPROM stores the configuration information for the
SS4005G, such as the self-discharge rate, measurement
calibration, and design voltage and capacity.
The SS4005G uses the programmable self-
discharge rate and other compensation factors stored in
the EEPROM to accurately adjust remaining capacity for
use and standby conditions based on time, rate, and
temperature. The SS4005G also automatically calibrates
or learns the true battery capacity in the course of a
discharge cycle from near full to near empty levels.
The VREF output regulates the operating voltage for
the SS4005G from the battery cell stack using an
external MOSFET.
PIN CONFIGURATION
V2
V1
ADJ1
ADJ2
ADJ3
ADJ4
DCHG
AVDD
DVDD
VP
ESCL
ESDA
SDA
SCL
V3
V4
T
I
IGND
VREF
CHG
AGND
DGND
LED1
LED2
LED3
LED4
LED5
7/16/2006 Rev.3.01
V2
Voltage from tip of cell 2
V1
Voltage from tip of cell 1
ADJ1 Cell1 bypass control
ADJ2 Cell2 bypass control
ADJ3 Cell3 bypass control
ADJ4 Cell 4 bypass control
DCHG Discharge FET control output
AVDD Analog VDD
DVDD Digital VDD (4.5V~5.5V)
VP
EEPROM supply output
ESCL EEPROM clock (output)
ESDA EEPROM data (input/output)
SDA SMB data (input/output)
SCL SMB clock (input/output)
V3
V4
T
I
IGND
VREF
CHG
AGND
DGND
LED1
LED2
LED3
LED4
LED5
Voltage from tip of cell 3
Voltage from tip of cell 4
Temperature sense resistor input
Current sense resistor input
Current sense resistor ground port
Voltage reference output
Charge FET control output
Analog Ground
Digital ground
LED segment (MSB)
LED segment
LED segment
LED segment
LED segment (LSB)
www.SiliconStandard.com
1 of 22