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PDF DS2764 Data sheet ( Hoja de datos )

Número de pieza DS2764
Descripción High-Precision Li+ Battery Monitor
Fabricantes Maxim Integrated Products 
Logotipo Maxim Integrated Products Logotipo



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No Preview Available ! DS2764 Hoja de datos, Descripción, Manual

www.maxim-ic.com
GENERAL DESCRIPTION
The DS2764 high-precision Li+ battery monitor is a
data-acquisition, information-storage, and safety-
protection device tailored for cost-sensitive battery
pack applications. This low-power device integrates
precise temperature, voltage, and current
measurement, nonvolatile (NV) data storage, and Li+
protection into the small footprint of either a TSSOP
package or flip-chip package. The DS2764 is a key
component in applications requiring remaining
capacity estimation, safety monitoring, and battery-
specific data storage.
PIN CONFIGURATIONS
TOP VIEW
CC
PLS
DC
SNS
SNS
SNS
PS
IS2
1 16
2 15
23 14
4 13
5 12
6 11
7 10
89
TSSOP
VIN
VDD
SCL
VSS
VSS
VSS
SDA
IS1
12
34
PLS DC
SNS
A
B
PS
CC
SNS
PROBE
VIN VSS
PROBE
VDD SCL
VSS
C
IS2
D
IS1
E
SDA F
FLIP CHIP
(TOP VIEW¾BUMPS ON BOTTOM)
www.DataSheet4U.com
DS2764
High-Precision Li+ Battery Monitor
with 2-Wire Interface
FEATURES
§ Li+ Safety Circuit
Overvoltage Protection
Overcurrent/Short-Circuit Protection
Undervoltage Protection
§ 0V Battery Recovery Charge
§ Available in Two Configurations:
Internal 25mW Sense Resistor
External User-Selectable Sense Resistor
§ Current Measurement
12-Bit Bidirectional Measurement
Internal Sense Resistor Configuration:
0.625mA LSB and ±1.9A Dynamic Range
External Sense Resistor Configuration:
15.625mV LSB and ±64mV Dynamic Range
§ Current Accumulation:
Internal Sense Resistor: 0.25mAhr LSB
External Sense Resistor: 6.25mVhr LSB
§ Voltage Measurement with 4.88mV Resolution
§ Temperature Measurement Using Integrated
Sensor with 0.125°C Resolution
§ 40 Bytes of Lockable EEPROM
§ Option for Unique 64-bit ID
§ Industry 2-Wire Interface with Programmable
Slave Address
§ Low-Power Consumption:
Active Current: 60mA typ, 90mA max
Sleep Current: 1mA typ, 2mA max
APPLICATIONS
PDAs
Cell Phones/Smartphones
Digital Cameras
ORDERING INFORMATION
PART
TEMP RANGE PIN-PACKAGE
DS2764BE
-20°C to +70°C 16 TSSOP
Selector Guide appears at end of data sheet, for additional
options.
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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DS2764 pdf
Note 14:
Note 15:
Note 16:
Note 17:
DS2764 High-Precision Li+ Battery Monitor With w2w-Ww.iDreataISnhteeetr4fUa.ccoem
The maximum tHD:DAT has only to be met if the device does not stretch the LOW period (tLOW) of the SCL signal.
This device internally provides a hold time of at least 300 ns for the SDA signal (referred to the VIHmin of the SCL
signal) to bridge the undefined region of the falling edge of SCL.
Filters on SDA and SCL suppress noise spikes at the input buffers and delay the sampling instant.
CB¾ total capacitance of one bus line in pF.
Figure 1. I2C Bus Timing Diagram
SDA
tF
tLOW
tR
tSU;DAT
SCL
S
tHD;STA
tHD;DAT
tF
tHD;STA
tSU;STA
Sr
tSP tR
tBUF
tSU;STO
P
S
I2C is a trademark of Philips Corp. Purchase of I2C components from Maxim Integrated Products, Inc., or one of its sublicensed Associated
Companies, conveys a license under the Philips I2C Patent Rights to use these components in an I2C system, provided that the system
conforms to the I2C Standard Specification as defined by Philips.
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DS2764 arduino
CURRENT MEASUREMENT
DS2764 High-Precision Li+ Battery Monitor With w2w-Ww.iDreataISnhteeetr4fUa.ccoem
In active mode, the DS2764 continually measures the current flow into and out of the battery by measuring the
voltage drop across a current-sense resistor. The DS2764 is available in two configurations: 1) internal 25mW
current-sense resistor and 2) external user-selectable sense resistor. In either configuration, the DS2764 considers
the voltage difference between pins IS1 and IS2 (VIS = VIS1 - VIS2) to be the filtered voltage drop across the sense
resistor. A positive VIS value indicates current is flowing into the battery (charging), while a negative VIS value
indicates current is flowing out of the battery (discharging).
VIS is measured with a signed resolution of 12 bits. The current register is updated in two’s-complement format
every 88ms with an average of 128 readings. Current measurements outside the register range are reported at the
range limit. Each measurement is internally compensated for offset on a continual basis minimizing error resulting
from variations in device temperature and voltage. Figure 5 shows the format of the current register.
For the internal sense resistor configuration, the DS2764 maintains the current register in units of amps, with a
resolution of 0.625mA and full-scale range of no less than ±1.9A (see Note 7 on IFS spec for more details). The
DS2764 automatically compensates for internal sense resistor process variations and temperature effects when
reporting current.
For the external sense resistor configuration, the DS2764 writes the measured VIS voltage to the current register,
with a 15.625mV resolution and a full-scale ±64mV range.
Figure 5. Current Register Format
MSB—Address 0E
S 211 210 29 28 27 26 25
MSb
LSb
LSB—Address 0F
24 23 22 21 20 X X X
MSb
LSb
Units: 0.625mA for Internal Sense Resistor
15.625mV for External Sense Resistor
CURRENT ACCUMULATOR
The current accumulator facilitates remaining capacity estimation by tracking the net current flow into and out of the
battery. Current flow into the battery increments the current accumulator while current flow out of the battery
decrements it. Data is maintained in the current accumulator in two’s-complement format. Figure 6 shows the
format of the current accumulator.
When the internal sense resistor is used, the DS2764 maintains the current accumulator in units of amp-hours, with
a 0.25mAhrs resolution and full-scale ±8.2Ahrs range. When using an external sense resistor, the DS2764
maintains the current accumulator in units of volt-hours, with a 6.25mVhrs resolution and a full-scale ±205mVhrs
range.
The current accumulator is a read/write register that can be altered by the host system as needed.
Figure 6. Current Accumulator Format
MSB—Address 10
S 214 213 212 211 210 29 28
MSb
LSb
LSB—Address 11
27 26 25 24 23 22 21 20
MSb
LSb
Units: 0.25mAhrs for Internal Sense Resistor
6.25mVhrs for External Sense Resistor
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