DS2764 Просмотр технического описания (PDF) - Maxim Integrated
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DS2764 Datasheet PDF : 20 Pages
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DS2764 High-Precision Li+ Battery Monitor With 2-Wire Interface
ELECTRICAL CHARACTERISTICS: 2-WIRE INTERFACE
(2.5V £ VDD £ 5.5V, TA = -20°C to +70°C.)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP MAX UNITS
SCL Clock Frequency
Bus Free Time Between a STOP
and START Condition
Hold Time (Repeated)
START Condition
Low Period of SCL Clock
fSCL
tBUF
tHD:STA
tLOW
(Note 12)
(Note 13)
0
100 KHz
4.7
µs
4.0
µs
4.7
µs
High Period of SCL Clock
Setup Time for a Repeated
START Condition
Data Hold Time
tHIGH
tSU:STA
tHD:DAT
(Note 14, 15)
4.0
µs
4.7
µs
0
5.0
µs
Data Setup Time
Rise Time of both SDA and
SCL Signals
Fall Time of both SDA and
SCL Signals
Setup Time for STOP
Condition
Spike pulse widths suppressed by
input filter
Capacitive Load for each Bus
Line
SCL, SDA Input Capacitance
tSU:DAT
tR
tF
tSU:STO
tSP
CB
CBIN
(Note 14)
(Note 16)
(Note 17)
250
ns
1000 ns
300
ns
4.0
µs
0
50
ns
400
pF
60
pF
EEPROM RELIABILITY SPECIFICATION
(2.5V £ VDD £ 5.5V, TA = -20°C to +70°C.)
PARAMETER
SYMBOL
CONDITIONS
Copy to EEPROM Time
tEEC
EEPROM Copy Endurance
NEEC
(Note 11)
MIN
TYP
MAX UNITS
2
10
ms
25,000
cycles
Note 1:
Note 2:
Note 3:
Note 4:
Note 5:
Note 6:
Note 7:
Note 8:
Note 9:
Note 10:
Note 11:
Note 12:
Note 13:
All voltages are referenced to VSS.
See the Selector Guide section to determine the corresponding part number for each VOV value.
Internal current-sense resistor configuration.
External current-sense resistor configuration.
Self-heating due to output pin loading and sense resistor power dissipation can alter the reading from ambient conditions.
Compensation of the internal sense resistor value for initial tolerance and temperature coefficient of -20°C to +70°C can reduce
the maximum reportable magnitude to 1.9A.
Current offset error null to ±1 LSB typically requires 3.5s in-system calibration by user.
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.
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.
Typical value for tERR1 is specified at 3.6V and +25°C, max value is specified for 0°C to +50°C. Max value for tERR2 is specified
for -20°C to +70°C.
Four-year data retention at +70°C.
Timing must be fast enough to prevent the DS2764 from entering sleep mode due to bus low for period > tSLEEP
fSCL must meet the minimum clock low time plus the rise/fall times.
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