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DS2751数据手册封面

DS2751 Datasheet

  • DS2751

  • 1-Cell Li-Ion or 3-Cell NiMH Fuel Gauge

  • 234.43KB

  • Maxim   Maxim

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DS2751
Figure 4. CURRENT ACCUMULATOR FORMAT
MSB鈥擜ddress 10
S
MSb
2
14
2
13
2
12
2
11
2
10
2
9
2
8
LSb
2
7
MSb
2
6
LSB鈥擜ddress 11
2
5
2
4
2
3
2
2
2
1
2
0
LSb
Units: 0.25mAhrs for internal sense resistor
6.25mVhrs 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 can be utilized to alter any other sources of offset. This bias resides in
EEPROM address 33h in two鈥檚-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 bias is a value of 0.
Figure 5. CURRENT OFFSET BIAS
Address 33
S
MSb
2
6
2
5
2
4
2
3
2
2
2
1
2
0
LSb
Units: 0.625mA for internal sense resistor
15.625mV for external sense resistor
VOLTAGE MEASUREMENT
The DS2751 continually measures the voltage between pins V
IN
and V
SS
over a 0 to 4.5V range. The
Voltage Register is updated in two鈥檚-complement format every 3.4ms 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 6.
Figure 6. VOLTAGE REGISTER FORMAT
MSB鈥擜ddress 0C
S
MSb
2
9
2
8
2
7
2
6
2
5
2
4
2
3
LSb
2
2
MSb
2
1
LSB鈥擜ddress 0D
2
0
X
X
X
X
X
LSb
Units: 4.88 mV
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