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011005
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.
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
FEATURES
Li+ Safety Circuit
Overvoltage Protection
Overcurrent/Short-Circuit Protection
Undervoltage Protection
0V Battery Recovery Charge
Available in Two Configurations:
Internal 25m
W 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:
15.625
mV LSB and 64mV Dynamic Range
Current Accumulation:
Internal Sense Resistor: 0.25mAhr LSB
External Sense Resistor: 6.25
mVhr LSB
Voltage Measurement with 4.88mV Resolution
Temperature Measurement Using Integrated
Sensor with 0.125C 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: 60
mA typ, 90mA max
Sleep Current: 1
mA typ, 2mA max
APPLICATIONS
PDAs
Cell Phones/Smartphones
Digital Cameras
ORDERING INFORMATION
PART TEMP
RANGE
PIN-PACKAGE
DS2764BE
-20C to +70C
16 TSSOP
Selector Guide appears at end of data sheet, for additional
options.
DS2764
High-Precision Li+ Battery Monitor
with 2-Wire Interface
www.maxim-ic.com
TOP VIEW
CC
V
IN
V
DD
SCL
V
SS
V
SS
V
SS
SDA
IS1
TSSOP
IS2
SNS
SNS
1
2
2
3
2
1
4
5
6
7
8
16
15
14
13
12
11
10
9
SNS
PS
PLS
DC
FLIP CHIP
(TOP VIEW
BUMPS ON BOTTOM)
PLS
DC PS
CC IS2
V
IN
IS1
V
DD
SCL SDA
SNS
V
SS
1 2 3 4
A
B
C
D
E
F
SNS
PROBE
V
SS
PROBE
DS2764 High-Precision Li+ Battery Monitor with 2-Wire Interface
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ABSOLUTE MAXIMUM RATINGS
Voltage Range on PLS and
CC Pins, Relative to V
SS
-0.3V to +18V
Voltage Range on Any Other Pin, Relative to V
SS
-0.3V to +6V
Continuous Internal Sense Resistor Current
2.5A
Pulsed Internal Sense Resistor Current
50A for <100s/s, <1000 pulses
Operating Temperature Range
-40C to +85C
Storage Temperature Range
-55C to +125C
Soldering Temperature
See IPC/JEDEC J-STD-020A Specification
Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only,
and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is
not implied. Exposure to the absolute maximum rating conditions for extended periods may affect device.
RECOMMENDED DC OPERATING CONDITIONS
(2.5V
V
DD
5.5V, T
A
= -20C to +70C.)
PARAMETER SYMBOL CONDITIONS MIN
TYP
MAX
UNITS
Supply Voltage
V
DD
(Note
1)
2.5 5.5 V
Voltage Sense Input
V
IN
(Note
1)
-0.3
V
DD
+ 0.3
V
Serial Interface Pins
SCL, SDA
(Note 1)
-0.3
+5.5
V
DC ELECTRICAL CHARACTERISTICS
(2.5V
V
DD
5.5V, T
A
= -20C to +70C.)
PARAMETER SYMBOL CONDITIONS MIN
TYP
MAX
UNITS
Active Current
I
ACTIVE
SCL = SDA = V
DD
, normal
operation
60
90
mA
Sleep Mode Current
I
SLEEP
SCL = SDA = 0V, no activity,
PS
floating
1 2
mA
Input Logic High: SCL, SDA
V
IH
(Note
1)
1.5 V
Input Logic High:
PS
V
IH
(Note 1)
0.7 x V
DD
V
Input Logic Low: SCL, SDA
V
IL
(Note
1)
0.4 V
Input Logic Low:
PS
V
IL
(Note 1)
0.3 x V
DD
V
Output Logic High:
CC
V
OH
I
OH
= -0.1mA (Note 1)
V
PLS
- 0.4
V
Output Logic High:
DC
V
OH
I
OH
= -0.1mA (Note 1)
V
DD
- 0.4
V
Output Logic Low:
CC
V
OL_CC
I
OL
= 0.1mA (Note 1)
0.4
V
Output Logic Low:
DC
V
OL_DC
I
OL
= 0.5
mA (Note 1)
0.4
V
Output Logic Low: SDA
V
OL
I
OL
= 4mA (Note 1)
0.4
V
Pulldown Current: SCL, SDA
I
PD
1
mA
Input Resistance: V
IN
R
IN
5
M
W
Internal Current-Sense Resistor
R
SNS
+25C 20
25
30
m
W
Bus Low to Sleep time
t
SLEEP
2.1
s
DS2764 High-Precision Li+ Battery Monitor With 2-Wire Interface
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ELECTRICAL CHARACTERISTICS: PROTECTION CIRCUITRY
(2.5V
V
DD
5.5V, T
A
= 0C to +50C.)
PARAMETER SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
4.325 4.350 4.375
Overvoltage Detect
V
OV
(Notes
1,
2)
4.250 4.275 4.300
V
Charge Enable
V
CE
(Note
1)
4.10 4.15
4.20 V
Undervoltage Detect
V
UV
(Note
1)
2.5 2.6 2.7 V
Overcurrent Detect
I
OC
(Note 3)
1.8
1.9
2.0
A
Overcurrent Detect
V
OC
(Notes
1,
4)
45 47.5 50 mV
Short-Circuit Detect
I
SC
(Note
3)
5.0 8.0 11 A
Short-Circuit Detect
V
SC
(Notes 1, 4)
150
200
250
mV
Overvoltage Delay
t
OVD
0.8 1 1.2 s
Undervoltage Delay
t
UVD
90 100 110 ms
Overcurrent Delay
t
OCD
5 10 20 ms
Short-Circuit Delay
t
SCD
160
200
240
ms
Test Threshold
V
TP
0.5
1.0
1.5
V
Test Current
I
TST
5
20
40
mA
ELECTRICAL CHARACTERISTICS: TEMPERATURE, VOLTAGE, CURRENT
(2.5V
V
DD
5.5V, T
A
= -20C to +50C.)
PARAMETER SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Temperature Resolution
T
LSB
0.125
C
Temperature Full-Scale Magnitude
T
FS
127
C
Temperature Error
T
ERR
(Note 5)
3
C
Voltage Resolution
V
LSB
4.88
mV
Voltage Full-Scale Magnitude
V
FS
4.75
V
Voltage Gain Error
V
GERR
5
%
(Note 3)
0.625
mA
Current Resolution
I
LSB
(Note 4)
15.625
mV
(Notes 3, 6)
1.9
2.56
A
Current Full-Scale Magnitude
I
FS
(Note 4)
64
mV
Current Offset Error
I
OERR
(Note 7)
1
LSB
(Notes 3, 8, 9)
10
Current Gain Error
I
GERR
(Note 4)
2
%
(Note 3)
0.25
mAh
Accumulated Current Resolution
q
CA
(Note 4)
6.25
Vhr
Current Sampling Frequency
f
SAMP
1456
Hz
t
ERR1
(Note 10)
1
3
%
Internal Timebase Accuracy
t
ERR2
(Note 10)
6.5
%
DS2764 High-Precision Li+ Battery Monitor With 2-Wire Interface
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ELECTRICAL CHARACTERISTICS: 2-WIRE INTERFACE
(2.5V
V
DD
5.5V, T
A
= -20
C to +70C.)
PARAMETER SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
SCL Clock Frequency
fSCL
(Note 12)
0
100
KHz
Bus Free Time Between a STOP
and START Condition
tBUF
4.7
s
Hold Time (Repeated)
START Condition
tHD:STA
(Note 13)
4.0
s
Low Period of SCL Clock
tLOW
4.7
s
High Period of SCL Clock
tHIGH
4.0
s
Setup Time for a Repeated
START Condition
tSU:STA
4.7
s
Data Hold Time
tHD:DAT
(Note 14, 15)
0
5.0
s
Data Setup Time
tSU:DAT
(Note 14)
250
ns
Rise Time of both SDA and
SCL Signals
tR
1000 ns
Fall Time of both SDA and
SCL Signals
tF
300 ns
Setup Time for STOP
Condition
tSU:STO
4.0
s
Spike pulse widths suppressed by
input filter
tSP
(Note 16)
0
50
ns
Capacitive Load for each Bus
Line
CB
(Note 17)
400
pF
SCL, SDA Input Capacitance
C
BIN
60
pF
EEPROM RELIABILITY SPECIFICATION
(2.5V
V
DD
5.5V, T
A
= -20
C to +70C.)
PARAMETER SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Copy to EEPROM Time
t
EEC
2
10
ms
EEPROM Copy Endurance
N
EEC
(Note 11)
25,000
cycles
Note 1:
All voltages are referenced to V
SS
.
Note 2:
See the Selector Guide section to determine the corresponding part number for each V
OV
value.
Note 3:
Internal current-sense resistor configuration.
Note 4:
External current-sense resistor configuration.
Note 5:
Self-heating due to output pin loading and sense resistor power dissipation can alter the reading from ambient conditions.
Note 6:
Compensation of the internal sense resistor value for initial tolerance and temperature coefficient of -20C to +70C can reduce
the maximum reportable magnitude to 1.9A.
Note 7:
Current offset error null to 1 LSB typically requires 3.5s in-system calibration by user.
Note 8:
Current gain error specification applies to gain error in converting the voltage difference at IS1 and IS2, and excludes any error
remaining after the DS2764 compensates for the internal sense resistor's temperature coefficient of 3700ppm/
C to an accuracy
of
500ppm/C. The DS2764 does not compensate for external sense resistor characteristics, and any error terms arising from
the use of an external sense resistor should be taken into account when calculating total current measurement error.
Note 9:
Accuracy at time of shipment from Dallas Semiconductor is 3% max. Flip-chip board mounting processes may cause the
current gain error to widen to as much as 10% for flip chip devices with the internal sense resistor option. Contact factory for
on-board recalibration procedure for flip chip devices with the internal sense resistor option to improve accuracy.
Note 10:
Typical value for t
ERR1
is specified at 3.6V and +25C, max value is specified for 0C to +50C. Max value for t
ERR2
is specified
for -20C to +70C.
Note 11:
Four-year data retention at +70
C.
Note 12:
Timing must be fast enough to prevent the DS2764 from entering sleep mode due to bus low for period >
t
SLEEP
Note 13:
f
SCL
must meet the minimum clock low time plus the rise/fall times.
DS2764 High-Precision Li+ Battery Monitor With 2-Wire Interface
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Note 14:
The maximum t
HD:DAT
has only to be met if the device does not stretch the LOW period (t
LOW
) of the SCL signal.
Note 15:
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.
Note 16:
Filters on SDA and SCL suppress noise spikes at the input buffers and delay the sampling instant.
Note 17:
C
B
total capacitance of one bus line in pF.
Figure 1. I
2
C Bus Timing Diagram
SDA
SCL
t
F
t
R
t
SU;DAT
t
LOW
S
t
HD;STA
t
HD;DAT
t
F
t
SU;STA
t
HD;STA
t
SU;STO
t
R
t
BUF
t
SP
Sr
P
S
I
2
C is a trademark of Philips Corp. Purchase of I
2
C components from Maxim Integrated Products, Inc., or one of its sublicensed Associated
Companies, conveys a license under the Philips I
2
C Patent Rights to use these components in an I
2
C system, provided that the system
conforms to the I
2
C Standard Specification as defined by Philips.
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