Socvf register (ffh), Tte register (11h), Age register (07h) – Rainbow Electronics MAX17047 User Manual
Page 17: Figure 15. soc register format (output), Figure 16. tte register format (output), Figure 17. age register format (output)
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MAX17047
ModelGauge m3 Fuel Gauge
Figure 15. SOC
VF
Register Format (Output)
Figure 16. TTE Register Format (Output)
Figure 17. Age Register Format (Output)
SOC
VF
Register (FFh)
The SOC
VF
register holds the calculated present SOC of
the battery according to the voltage fuel gauge. The reg-
ister value is stored as a percentage with a resolution of
0.0039% per LSb. If an 8-bit SOC value is desired, the host
can discard the lower byte and use only the upper byte of
the register with a resolution of 1.0%.
shows the
SOC
VF
register format.
TTE Register (11h)
The TTE register holds the estimated time to empty for
the application under present conditions. The TTE value
is determined by dividing the RemCap
AV
register by the
AverageCurrent register. The result is stored in the TTE
register with a resolution of 5.625s per LSb.
Alternatively, the TTE register can be used to estimate time
to empty for any given current load. Whenever the AtRate
register is programmed to a negative number, representing
a discharge current, the TTE register displays the estimated
time to empty for the application based on the AtRate regis-
ter value.
shows the TTE register format.
Age Register (07h)
The Age register contains a calculated percentage value
of the application’s present cell capacity compared to its
expected capacity. The result can be used by the host to
gauge the cell’s health as compared to a new cell of the
same type. The result is displayed as a percentage value
from 0 to 256% with a 0.0039% LSb.
shows the
Age register format. The equation for the register output is:
Age Register = 100% O (FullCAP Register/
DesignCap Register)
MSB—ADDRESS FFh
LSB—ADDRESS FFh
2
7
2
6
2
5
2
4
2
3
2
2
2
1
2
0
2
-1
2
-2
2
-3
2
-4
2
-5
2
-6
2
-7
2
-8
MSb
LSb
MSb
LSb
2
-8
UNITS: 0.0039%
2
0
UNITS: 1.0%
MSB—ADDRESS 11h
LSB—ADDRESS 11h
2
10
2
9
2
8
2
7
2
6
2
5
2
4
2
3
2
2
2
1
2
0
2
-1
2
-2
2
-3
2
-4
2
-5
MSb
LSb
MSb
LSb
2
0
UNITS: 3.0min
MSB—ADDRESS 07h
LSB—ADDRESS 07h
2
7
2
6
2
5
2
4
2
3
2
2
2
1
2
0
2
-1
2
-2
2
-3
2
-4
2
-5
2
-6
2
-7
2
-8
MSb
LSb
MSb
LSb
2
0
UNITS: 1.0%
2
-8
UNITS: 0.0039%