Rainbow Electronics DS2756 - Manual (Page 3)

DS2756: High-Accuracy Battery Fuel Gauge with Programmable Suspend Mode
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Period
Undervoltage Detect
V
UV
2.4V < V
DD
< 5.5V (Note 1) 2.45 2.5 2.55 V
Undervoltage Delay t
UVD
79 82 85 ms
Internal Timebase
Accuracy
t
ERR
(Note 9) ±1 ±2 %
ELECTRICAL CHARACTERISTICS—1-WIRE INTERFACE
(3.0V
£ V
DD
£ 5.5V, T
A
= -20 °C to +70°C.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Snapshot Trigger 0 t
SWL
1 16 ms
Snapshot Delay t
SDLY
80 100 120 ms
STANDARD TIMING
Time Slot
t
SLOT
60 120 ms
Recovery Time t
REC
1 ms
Write-0 Low Time t
LOW0
60 119 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
Interrupt Time Low t
IL
480 1920 ms
OVERDRIVE TIMING
Time Slot
t
SLOT
6 16 ms
Recovery Time t
REC
1 ms
Write-0 Low Time t
LOW0
6 16 ms
Write-1 Low Time t
LOW1
1 2 ms
Read Data Valid t
RDV
2 ms
Reset Time High t
RSTH
48 ms
Reset Time Low t
RSTL
48 80 ms
Presence-Detect High t
PDH
2 6 ms
Presence-Detect Low t
PDL
8 24 ms
Interrupt Time Low t
IL
48 192 ms
EEPROM RELIABILITY SPECIFICATION
(3.0V £ V
DD
£ 5.5V, T
A
= -20 °C to +70°C.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Copy to EEPROM Time t
EEC
2 10 ms
EEPROM Copy Endurance N
EEC
(Note 10) 50,000 cycles
Note 1: All voltages are referenced to V
SS
.
Note 2: Specifications relative to V
IS1
- V
IS2
.
Note 3: Summation of worst case time base and current measurement sampling errors.
Note 4: Continuous offset cancellation corrects offset errors in the current measurement system. Individual values reported by the
Current register have a maximum offset of ±0.5 LSb’s (±7.8125
mV). Individual values reported in the Average Current register
have a maximum offset of ±2 LSb’s (±7.8125 mV).
Note 5: Current Gain Error specifies the gain error in the Current register value compared to a reference voltage between IS1 and IS2.
The DS2756 does not compensate for sense resistor characteristics, and any error terms arising from the sense resistor should
be taken into account when calculating total current measurement error.
Note 6: Achieving the 24 Hour Accumulated Current Error assumes positive offset accumulation blanking is enabled (OBEN bit set) and
can require a one time 3.5s in-system calibration after mounting to the printed circuit board. Variations in temperature and supply
voltage are compensated for by periodic offset corrections performed automatically during Active mode operation.
Note 7: Voltage offset measurement is with respect to 4.2V at +25°C.
Note 8: Self heating due to output pin loading and sense resistor power dissipation can alter the Temperature reading from ambient
conditions.
Note 9: Typical value for t
ERR
valid at 3.7V and +25 °C. t
ERR
applies to all internal timings (ex. f
SAMP
, t
SLEEP
, t
UVD
) except for the 1-Wire
Interface timings and t
SUS_ERR
.
Note 10: Four year data retention at +50 °C.
Note 11: Measured during the Suspend Timeout. Does not include active period of suspend cycle.