Cycles register (17h), Vfocv register (fbh), Fullcap register (10h) – Rainbow Electronics MAX17047 User Manual
Page 18: Figure 18. cycles register format (outpu, Figure 19. vfocv register format (output, Figure 20. fullcap register format (outp
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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
section
for details. See
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
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.
is the FullCAP register format. See
the
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%