MAX17040 데이터 시트보기 (PDF) - Maxim Integrated
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MAX17040 Datasheet PDF : 13 Pages
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MAX17040/MAX17041
1-Cell/2-Cell Fuel Gauge with ModelGauge
Table 1. Register Summary
ADDRESS
(HEX)
02h–03h
04h–05h
06h–07h
08h–09h
0Ch–0Dh
FEh–FFh
REGISTER
VCELL
SOC
MODE
VERSION
RCOMP
COMMAND
DESCRIPTION
Reports 12-bit A/D measurement of battery voltage.
Reports 16-bit SOC result calculated by ModelGauge algorithm.
Sends special commands to the IC.
Returns IC version.
Battery compensation. Adjusts IC performance based on
application conditions.
Sends special commands to the IC.
READ/
WRITE
R
R
W
R
R/W
W
DEFAULT
(HEX)
—
—
—
—
9700h
—
VCELL Register
Battery voltage is measured at the CELL pin input
with respect to GND over a 0 to 5.00V range for the
MAX17040 and 0 to 10.00V for the MAX17041 with
resolutions of 1.25mV and 2.50mV, respectively. The A/D
calculates the average cell voltage for a period of 125ms
after IC POR and then for a period of 500ms for every
cycle afterwards. The result is placed in the VCELL regis-
ter at the end of each conversion period. Figure 3 shows
the VCELL register format.
SOC Register
The SOC register is a read-only register that displays
the state of charge of the cell as calculated by the
ModelGauge algorithm. The result is displayed as a
percentage of the cell’s full capacity. This register auto-
matically adapts to variation in battery size since the
MAX17040/MAX17041 naturally recognize relative SOC.
Units of % can be directly determined by observing only
the high byte of the SOC register. The low byte provides
additional resolution in units 1/256%. The reported SOC
also includes residual capacity, which might not be avail-
able to the actual application because of early termination
voltage requirements. When SOC() = 0, typical applica-
tions have no remaining capacity.
The first update occurs within 250ms after POR of the IC.
Subsequent updates occur at variable intervals depend-
ing on application conditions. ModelGauge calculations
outside the register are clamped at minimum and maxi-
mum register limits. Figure 4 shows the SOC register
format.
MSB—ADDRESS 02h
211 210
29
28
27
26
25
24
MSB
LSB
0: BITS ALWAYS READ LOGIC 0
Figure 3. VCELL Register Format
LSB—ADDRESS 03h
23
22
21
20
0
0
0
0
MSB
LSB
UNITS: 1.25mV FOR MAX17040
2.50mV FOR MAX17041
27
26
MSB
MSB—ADDRESS 04h
25
24
23
22
21
20
LSB
Figure 4. SOC Register Format
2-1
2-2
MSB
LSB—ADDRESS 05h
2-3
2-4
2-5
2-6
2-7 2-8
LSB
UNITS: 1.0%
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