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DS2781: Two-Cell Standalone Fuel Gauge IC

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ACR register update period). A write to the ACR forces the ADC to perform an offset correction conversion and

update the internal offset correction factor. Current measurement and accumulation begins with the second

conversion following a write to the ACR. Writing ACR clears the fractional values in ACRL. The Format of the ACR

In order to preserve the ACR value in case of power loss, the ACR value is backed up to EEPROM. The ACR

value is recovered from EEPROM on power-up. See the Memory Map in Table 2 for specific address location and

backup frequency.

Figure 8. Accumulated Current Register Format, ACR

ACR

R/W & EE

MSB—Address 10h LSB—Address 11h

MSb LSb MSb LSb

Units: 6.25mVh/Rsns

Figure 9. Fractional/Low Accumulated Current Register Format, ACRL

ACRL

Read Only

MSB—Address 12h LSB—Address 13h

X X X X

MSb LSb MSb LSb

“X”: reserved Units:1.526nVHr/R

SNS

ACR LSb

SNS

VSS

VSNS

20m 15m 10m 5m

6.25Vh 312.5Ah 416.7Ah 625Ah 1.250mAh

ACR RANGE

SNS

VSS

VSNS

20m 15m 10m 5m

±409.6mVh ±20.48Ah ±27.30Ah ±40.96Ah ±81.92Ah

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Rainbow-electronics DS2781 Bedienungsanleitung Seite 10