DS2760

9

resistor, the DS2760 maintains the Current Accumulator in units of Volt-hours, with a resolution of

6.25

mVhrs and a full scale range of ±205 mVhrs.

The Current Accumulator is a read/write register that can be altered by the host system as needed.

CURRENT ACCUMULATOR FORMAT Figure 5

MSB—Address 10

LSb—Address 11

S

MSb

LSb

MSb

LSb

Units: 0.25 mAhrs for internal sense resistor

6.25

mVhrs for external sense resistor

CURRENT OFFSET COMPENSATION

Current measurement and the current accumulation are both internally compensated for offset on a

continual basis minimizing error resulting from variations in device temperature and voltage.

Additionally a constant bias may be utilized to alter any other sources of offset. This bias resides in

EEPROM address 33h in two’s-complement format and is subtracted from each current measurement.

The current offset bias is applied to both the internal and external sense resistor configurations. The

factory default for the current offset compensation is a value of 0.

CURRENT OFFSET BIAS Figure 6

Address 33

S

MSb

LSb

Units: 0.625 mA for internal sense resistor

15.625

mV for external sense resistor

VOLTAGE MEASUREMENT

The DS2760 continually measures the voltage between pins VIN and VSS over a range of 0 to 4.75V.

The resulting data is placed in the Voltage Register in two’s-complement format with a resolution of

4.88mV. Voltages above the maximum register value are reported as the maximum value. The Voltage

Register format is shown in Figure 7.

VOLTAGE REGISTER FORMAT Figure 7

MSB—Address 0C

LSb—Address 0D

S

X

X

X

X

X

MSb

LSb

MSb

LSb

Units: 4.88 mV