DS2755: High-Accuracy Battery Fuel Gauge with Snapshot

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ELECTRICAL CHARACTERISTICS—1-WIRE INTERFACE

(2.5V

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

Snapshot Trigger 0

1

16

μs

Snapshot Delay

80

100

120

μs

STANDARD TIMING

Time Slot

60

120

μs

Recovery Time

1

μs

Write-0 Low Time

60

119

μs

Write-1 Low Time

1

15

μs

Read Data Valid

15

μs

Reset Time High

480

μs

Reset Time Low

480

960

μs

Presence-Detect High

15

60

μs

Presence-Detect Low

60

240

μs

Interrupt Time Low

480

1920

μs

OVERDRIVE TIMING

Time Slot

6

16

μs

Recovery Time

1

μs

Write-0 Low Time

6

16

μs

Write-1 Low Time

1

2

μs

Read Data Valid

2

μs

Reset Time High

48

μs

Reset Time Low

48

80

μs

Presence-Detect High

2

6

μs

Presence-Detect Low

8

24

μs

Interrupt Time Low

48

192

μs

EEPROM RELIABILITY SPECIFICATION

(2.5V

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

Copy to EEPROM Time

2

10

ms

EEPROM Copy

Endurance

(Note 11)

50,000

cycles

Note 1:

Note 2:

Note 3:

The DS2755 requires a maximum of 25µAH of charge to transition into sleep mode.

Note 4:

Summation of worst case time base and current measurement sampling errors.

Note 5:

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

μV). Individual values reported in the Average Current register

have a maximum offset of ±2 LSb’s (±7.8125

μV).

Note 6:

Current Gain Error specifies the gain error in the Current register value compared to a reference voltage between IS1 and IS2.

The DS2755 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 7:

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 8:

Voltage offset measurement is with respect to 4.2V at +25°C.

Note 9:

Self heating due to output pin loading and sense resistor power dissipation can alter the Temperature reading from ambient

conditions.

Note 10:

Interface timings.

Note 11:

Four year data retention at +50

°C.