MAX17047/MAX17050
ModelGauge m3 Fuel Gauge
V_empty Register (3Ah)
Table 1. Cell Characterization Information
Registers
The V_empty register sets thresholds related to empty
detection during operation. Figure 29 is the V_empty
register format.
REGISTER
Characterization Table (48 words)
FullCap
ADDRESS
80h to AFh
10h
8
0
VE :VE —Empty Voltage. Sets the voltage level for
detecting empty. A 10mV resolution gives a 0 to 5.11V
range. This value is written to 3.12V at power-up.
DesignCap
18h
ICHGTerm
1Eh
6
0
VR :VR —Recovery Voltage. Sets the voltage level for
clearing empty detection. Once the cell voltage rises
above this point, empty voltage detection is reenabled.
A 40mV resolution gives a 0 to 5.08V range. This value is
written to 3.68V at power-up.
FullCapNom
23h
RCOMP0
38h
lavg_empty
36h
TempCo
39h
QResidual 00
QResidual 10
QResidual 20
QResidual 30
12h
Cell Characterization
Information Registers
22h
32h
42h
Proper cell characterization is required to achieve accu-
racy. The following registers (Table 1) hold information
that must be generated through a cell-characterization
procedure. Maxim provides a cell-characterization ser-
vice. Contact the factory for details.
MSB—ADDRESS 1Eh
LSB—ADDRESS 1Eh
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
S
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
MSb
LSb
MSb
UNITS: 1.5625FV/R
LSb
SENSE
Figure 28. ICHGTerm Register Format (Input)
MSB—ADDRESS 3Ah
LSB—ADDRESS 3Ah
8
8
6
5
4
3
2
1
0
6
5
4
3
2
1
0
VE
VE
VE
VE
VE
VE
VE
VE
VE
VR
VR
VR
VR
VR
VR
VR
MSb
LSb
MSb
0
LSb
VR UNITS: 40mV
0
VE UNITS: 10mV
Figure 29. V_empty Register Format (Input)
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