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MAX17047
ModelGauge m3 Fuel Gauge
Cycles Register (17h)
The Cycles register accumulates total percent change in
the cell during both charging and discharging. The result
is stored as a total count of full charge/discharge cycles.
For example, a full charge/discharge cycle results in
the Cycles register incrementing by 100%. The Cycles
register has a full range of 0 to 65535% with a 1% LSb.
This register is reset to 0% at power-up. To maintain the
lifetime cycle count of the cell, this register must be peri-
odically saved by the host and rewritten to the device at
power-up. See the Save and Restore Registers section
for details. See Figure 18 for the Cycles register format.
VFOCV Register (FBh)
The VFOCV register contains the raw open-circuit volt-
age output of the voltage fuel gauge. This value is used
in other internal calculations and can be read for debug
purposes. The result is a 12-bit value ranging from 2.5V
to 5.119V where 1 LSb is 1.25mV. The bottom 4 bits of
this register are don’t care bits. See Figure 19 for the
VFOCV register format.
FullCAP Register (10h)
This register holds the ModelGauge m3 algorithm calcu-
lated full capacity of the cell under best-case conditions
(light load, hot). A new full-capacity value is calculated
after the end of every charge cycle in the application. The
value is stored in terms of FVh and must be divided by
the application sense-resistor value to determine capac-
ity in mAh. Figure 20 is the FullCAP register format. See
the End-of-Charge Detection section.
Figure 19. VFOCV Register Format (Output)
Figure 20. FullCAP Register Format (Output)
Figure 18. Cycles Register Format (Output)
MSB—ADDRESS FBh LSB—ADDRESS FBh
2
11
2
10
2
9
2
8
2
7
2
6
2
5
2
4
2
3
2
2
2
1
2
0
X X X X
MSb LSb MSb LSb
2
0
UNITS: 1.25mV
X = DON’T CARE
MSB—ADDRESS 10h LSB—ADDRESS 10h
2
15
2
14
2
13
2
12
2
11
2
10
2
9
2
8
2
7
2
6
2
5
2
4
2
3
2
2
2
1
2
0
MSb LSb MSb LSb
2
0
UNITS: 5.0FVh/R
SENSE
(0.5mAh WHEN R
SENSE
= 0.010I)
MSB—ADDRESS 17h LSB—ADDRESS 17h
2
15
2
14
2
13
2
12
2
11
2
10
2
9
2
8
2
7
2
6
2
5
2
4
2
3
2
2
2
1
2
0
MSb LSb MSb LSb
2
0
UNITS: 1.0%
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