Datasheet

DS2762 High-Precision Li+ Battery Monitor With Alerts
5 of 25
ELECTRICAL CHARACTERISTICS: 1-WIRE INTERFACE
(2.5V £ V
DD
£ 5.5V, T
A
= -20°C to +70°C.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Time Slot t
SLOT
60 120
ms
Recovery Time t
REC
1
ms
Write 0 Low Time t
LOW0
60 120
ms
Write 1 Low Time t
LOW1
1 15
ms
Read Data Valid t
RDV
15
ms
Reset Time High t
RSTH
480
ms
Reset Time Low t
RSTL
480 960
ms
Presence Detect High t
PDH
15 60
ms
Presence Detect Low t
PDL
60 240
ms
SWAP Timing Pulse Width t
SWL
0.2 120
ms
SWAP Timing Pulse Falling Edge to DC
Release
t
SWOFF
(Note 13) 0 1
ms
SWAP Timing Pulse Rising Edge to DC
Engage
t
SWON
(Note 13) 0 1
ms
DQ Capacitance C
DQ
60 pF
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:
Test conditions are PLS = 4.1V, V
DD
= 2.5V. Maximum current for conditions of PLS = 15V, V
DD
= 0V is 10mA.
Note 6:
Self-heating due to output pin loading and sense resistor power dissipation can alter the reading from ambient conditions.
Note 7:
Voltage offset measurement is with respect to V
OV
at +25°C.
Note 8:
The current register supports measurement magnitudes up to 2.56A using the internal sense resistor option and 64mV with the
external resistor option. Compensation of the internal sense resistor value for process and temperature variation can reduce the
maximum reportable magnitude to 1.9A.
Note 9:
Current offset error null to ±1LSB typically requires 3.5s in-system calibration by user.
Note 10:
Current gain error specification applies to gain error in converting the voltage difference at IS1 and IS2, and excludes any error
remaining after the DS2762 compensates for the internal sense resistor’s temperature coefficient of 3700ppm/°C to an accuracy
of ±500ppm/°C. The DS2762 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 11:
Typical value for t
ERR1
is specified at 3.6V and +25°C, max value is specified for 0°C to +50°C. Max value for t
ERR2
is specified
for -20°C to +70°C.
Note 12:
Four-year data retention at +70°C.
Note 13:
Typical load capacitance on DC and CC is 1000pF.
Note 14:
Error at time of shipment from Dallas Semiconductor is 3% max. Board mounting processes may cause the current gain error
to widen to as much as 10% for devices with the internal sense resistor option. Contact factory for on-board recalibration
procedure for devices with the internal sense resistor option to improve accuracy.