Ichgterm register (1eh), V_empty register (3ah), Figure 27. ichgterm register format (inp – Rainbow Electronics MAX17047 User Manual
Page 22: Figure 28. v_empty register format (inpu
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MAX17047
ModelGauge m3 Fuel Gauge
ICHGTerm Register (1Eh)
The ICHGTerm register allows the device to detect when
a charge cycle of the cell has completed. The host
should set the ICHGTerm register value equal to the
exact charge termination current used in the application.
The device detects end of charge if all the following con-
ditions are met:
• SOC
VF
> FullSOCThr
• AND ICHGTerm x 0.125 < Current < ICHGTerm x 1.25
• AND ICHGTerm x 0.125 < Average Current <
ICHGTerm x 1.25
Values are stored in FV. Multiply the termination current
by the sense resistor to determine the desired register
value. This register has the same range and resolution
as the Current register.
shows the ICHGTerm
register format. ICHGTerm defaults to 150mA (03C0h) at
power-up.
V_empty Register (3Ah)
The V_empty register sets thresholds related to empty
detection during operation.
is the V_empty
register format.
VE
8
:VE
0
—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.
VR
6
:VR
0
—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.
Figure 27. ICHGTerm Register Format (Input)
Figure 28. V_empty Register Format (Input)
MSB—ADDRESS 1Eh
LSB—ADDRESS 1Eh
S
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
UNITS: 1.5625FV/R
SENSE
MSB—ADDRESS 3Ah
LSB—ADDRESS 3Ah
VE
8
VE
8
VE
6
VE
5
VE
4
VE
3
VE
2
VE
1
VE
0
VR
6
VR
5
VR
4
VR
3
VR
2
VR
1
VR
0
MSb
LSb
MSb
LSb
VR
0
UNITS: 40mV
VE
0
UNITS: 10mV