DS2756(2006) Просмотр технического описания (PDF) - Maxim Integrated
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DS2756 Datasheet PDF : 26 Pages
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Period
Undervoltage Detect
Undervoltage Delay
Internal Timebase
Accuracy
DS2756: High-Accuracy Battery Fuel Gauge with Programmable Suspend Mode
VUV
2.4V < VDD < 5.5V (Note 1)
2.45
2.5
2.55
V
tUVD
79
82
85
ms
tERR
(Note 9)
±1
±2
%
ELECTRICAL CHARACTERISTICS—1-WIRE INTERFACE
(3.0V £ VDD £ 5.5V, TA = -20°C to +70°C.)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Snapshot Trigger 0
Snapshot Delay
STANDARD TIMING
tSWL
tSDLY
1
16
ms
80
100
120
ms
Time Slot
Recovery Time
Write-0 Low Time
Write-1 Low Time
Read Data Valid
Reset Time High
Reset Time Low
Presence-Detect High
Presence-Detect Low
Interrupt Time Low
OVERDRIVE TIMING
tSLOT
tREC
tLOW0
tLOW1
tRDV
tRSTH
tRSTL
tPDH
tPDL
tIL
60
120
ms
1
ms
60
119
ms
1
15
ms
15
ms
480
ms
480
960
ms
15
60
ms
60
240
ms
480
1920
ms
Time Slot
Recovery Time
Write-0 Low Time
Write-1 Low Time
Read Data Valid
Reset Time High
Reset Time Low
Presence-Detect High
Presence-Detect Low
Interrupt Time Low
tSLOT
tREC
tLOW0
tLOW1
tRDV
tRSTH
tRSTL
tPDH
tPDL
tIL
6
16
ms
1
ms
6
16
ms
1
2
ms
2
ms
48
ms
48
80
ms
2
6
ms
8
24
ms
48
192
ms
EEPROM RELIABILITY SPECIFICATION
(3.0V £ VDD £ 5.5V, TA = -20°C to +70°C.)
PARAMETER
SYMBOL
CONDITIONS
Copy to EEPROM Time
EEPROM Copy Endurance
tEEC
NEEC
(Note 10)
MIN
TYP
2
50,000
MAX
10
UNITS
ms
cycles
Note 1:
Note 2:
Note 3:
Note 4:
Note 5:
Note 6:
Note 7:
Note 8:
Note 9:
Note 10:
Note 11:
All voltages are referenced to VSS.
Specifications relative to VIS1 - VIS2.
Summation of worst case time base and current measurement sampling errors.
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 (±7.8125mV). Individual values reported in the Average Current register
have a maximum offset of ±2 LSb’s (±7.8125mV).
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.
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.
Voltage offset measurement is with respect to 4.2V at +25°C.
Self heating due to output pin loading and sense resistor power dissipation can alter the Temperature reading from ambient
conditions.
Typical value for tERR valid at 3.7V and +25°C. tERR applies to all internal timings (ex. fSAMP, tSLEEP, tUVD) except for the 1-Wire
Interface timings and tSUS_ERR.
Four year data retention at +50°C.
Measured during the Suspend Timeout. Does not include active period of suspend cycle.
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