DS2778 Maxim Integrated Products, DS2778 Datasheet - Page 24

• Manufacturer Part Number: DS2778
• Description: 2-Cell Stand-Alone Li+ Fuel-Gauge IC
• Manufacturer: Maxim Integrated Products

2-Cell, Stand-Alone, Li+ Fuel-Gauge IC with
Protector and Optional SHA-1 Authentication
Figure 16. Remaining Active Absolute Capacity (RAAC) [mAh]
The RAAC register reports the capacity available under the current temperature conditions to the the active-empty
point in absolute units of milliamps/hour (mAh). RAAC is 16 bits.
Figure 17. Remaining Standby Absolute Capacity (RSAC) [mAh]
The RSAC register reports the remaining battery capacity available under the current temperature conditions to the
standby-empty point capacity in absolute units of milliamps/hour (mAh). RSAC is 16 bits.
Figure 18. Remaining Active Relative Capacity (RARC) [%]
The RARC register reports the remaining battery capacity available under the current temperature conditions to the
active-empty point in relative units of percent (%). RARC is 8 bits.
Figure 19. Remaining Standby Relative Capacity (RSRC) [%]
The RSRC register reports the remaining battery capacity available under the current temperature conditions to the
standby-empty point capacity in relative units of percent (%). RSRC is 8 bits.
RAAC [mAh] = (ACR[mVh] - AE(T) x FULL40[mVh]) x RSNSP [mhos]*
RSAC [mAh] = (ACR[mVh] - SE(T) x FULL40[mVh]) x RSNSP [mhos]*
RARC [%] = 100% x (ACR[mVh] - AE(T) x FULL40[mVh])/{(AS x FULL(T) - AE(T)) x FULL40[mVh]}
RSRC [%] = 100% x (ACR[mVh] - SE(T) x FULL40[mVh])/{(AS x FULL(T) - SE(T)) x FULL40[mVh]}
* RSNSP = 1/R
24
MSb
MSb
2
______________________________________________________________________________________
2
15
15
2
2
SNS
14
14
2
2
13
13
MSB—ADDRESS 04h
MSB—ADDRESS 02h
2
2
12
12
2
2
11
MSb
MSb
11
2
2
15
15
2
2
10
10
2
2
14
14
2
2
9
9
2
2
13
13
MSB–ADDRESS 06h
MSB–ADDRESS 07h
LSb
LSb
2
2
8
8
2
2
12
12
2
2
11
11
UNITS: 1.6mAh
UNITS: 1.6mAh
MSb
MSb
2
2
7
7
2
2
10
10
2
2
6
6
2
UNITS: 1%
2
UNITS: 1%
9
9
2
2
LSB—ADDRESS 05h
5
LSB—ADDRESS 03h
5
LSb
LSb
2
2
8
8
2
2
4
4
Calculation of Results
2
2
3
3
2
2
2
2
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2
2
1
1
LSb
LSb
2
2
0
0