DS2760 查看數據表（PDF） - Dallas Semiconductor -> Maxim Integrated

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DS2760

High Precision Li-Ion Battery Monitor

Dallas Semiconductor -> Maxim Integrated 

DS2760

Summary. All of the protection conditions described above are OR'ed together to affect the CC and DC

outputs.

DC = (Undervoltage) or (Overcurrent, EITHER Direction) or (Short Circuit) or

(Protection Register bit DE = 0) or (Sleep Mode)

CC = (Overvoltage) or (Overcurrent, Charge Direction) or (Protection Register bit CE = 0) or

(Sleep Mode)

CURRENT MEASUREMENT

In the Active Mode of operation, the DS2760 continually measures the current flow into and out of the

battery by measuring the voltage drop across a current sense resistor. The DS2760 is available in two

configurations: (1) internal 25 mΩ current sense resistor, and (2) external user-selectable sense resistor. In

either configuration, the DS2760 considers the voltage difference between pins IS1 and IS2 (VIS = VIS1 –

VIS2) to be the filtered voltage drop across the sense resistor. A positive VIS value indicates current is

flowing into the battery (charging), while a negative VIS value indicates current is flowing out of the

battery (discharging). Note than when an external sense resistor is used, one end of the resistor must be

wired directly to VSS (the negative terminal of the cell) for proper operation of the current measurement

circuitry.

VIS is measured with a signed resolution of 12-bits. Measurements are placed in the Current Register in

two’s-complement format. Currents outside the range of the register are reported at the limit of the range.

The format of the Current Register is shown in Figure 4.

For the internal sense resistor configuration, the DS2760 maintains the Current Register in units of Amps,

with a resolution of 0.625 mA and full scale range of no less than ±1.8A (see Note 7 on IFS spec for more

details). The DS2760 automatically compensates for internal sense resistor process variations and

temperature effects when reporting current.

For the external sense resistor configuration, the DS2760 writes the measured VIS voltage to the Current

Register, with a resolution of 15.625 µV and a full scale range of ±64 mV.

CURRENT REGISTER FORMAT – Figure 4

MSB—Address 0E

S 211 210 29 28 27 26 25

MSb

LSb

LSB—Address 0F

24 23 22 21 20 X X X

MSb

LSb

Units: 0.625 mA for internal sense resistor

15.625 µV for external sense resistor

CURRENT ACCUMULATOR

The Current Accumulator facilitates remaining capacity estimation by tracking the net current flow into

and out of the battery. Current flow into the battery increments the Current Accumulator while current

flow out of the battery decrements it. Data is maintained in the Current Accumulator in two’s-

complement format. The format of the Current Accumulator is shown in Figure 5.

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