DS2786BG+ Maxim Integrated Products, DS2786BG+ Datasheet - Page 7

• Manufacturer Part Number: DS2786BG+
• Description: IC FUEL GAUGE OCV-BASED 10-TDFN
• Manufacturer: Maxim Integrated Products

Specifications of DS2786BG+

• Function: Fuel, Gas Gauge/Monitor
• Battery Type: Lithium-Ion (Li-Ion), Lithium-Polymer (Li-Pol)
• Voltage - Supply: 2.5 V ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 10-TDFN Exposed Pad
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

The DS2786B provides accurate relative capacity mea-
surements during periods of host system inactivity by
looking at cell open-circuit voltage. Cell capacity is cal-
culated using an OCV voltage profile and a 1-byte
scale factor to weight-accumulated current. The OCV
voltage profile and scale factor are stored in EEPROM
memory. The EEPROM memory is constructed with a
SRAM shadow so that the OCV voltage profile and
scale factor can be overwritten by the host to accom-
modate a variety of cell types and capacities from mul-
tiple-cell vendors. The I
read/write access to the Status, Configuration, and
Measurement Registers.
The DS2786B operates in one of two power modes:
Active and Sleep. While in Active Mode, the DS2786B
operates as a high-precision battery monitor with temper-
ature, voltage, auxiliary inputs, current, and accumulated
current measurements acquired continuously and the
Figure 3. Application Example
1nF
PROTECTION IC
(Li+/POLYMER)
BATTERY
_______________________________________________________________________________________
1nF
2
C interface also allows
Stand-Alone OCV-Based Fuel Gauge
Power Modes
PACK+
PACK-
(1) OPTIONAL FOR 8kV/15kV ESD
PACKID
THERM
1kΩ
1kΩ
resulting values updated in the measurement registers. In
Sleep Mode, the DS2786B operates in a low-power mode
with no measurement activity. Read-and-write access is
allowed to all registers in either mode.
The DS2786B operating mode transitions from sleep to
active when:
The DS2786B operating mode transitions from Active to
Sleep when:
Caution: If SMOD = 1, a pullup resistor is required on
SCL and SDA in order to ensure that the DS2786B tran-
sitions from Sleep to Active Mode when the battery is
charged. If the bus is not pulled up, the DS2786B
remains in Sleep and cannot accumulate the charge
current. This caution statement applies particularly to a
battery that is charged on a standalone charger.
(1)
SMOD = 1 and (SCL < V
5.6V
10nF
(SCL > V
150Ω
AIN0
V
V
AIN1
V
OUT
DD
SS
SYSTEM
2.5V
for t
IH
DS2786B
R
) or (SDA > V
SNS
SLEEP
V
PROG
SCL
SNS
SDA
(1)
V
IL
IN
1kΩ
) and (SDA < V
IH
)
PROGRAMMING
TEST POINT
SYSTEM
SERIAL
BUS
SYSTEM
VDD
SYSTEM
VSS
IL
)
7