RepSOC Register (06h)

Register Type: Percentage

RepSOC is the reported state-of-charge percentage output for use by the application user interface.

FullCapRep Register (10h)

Register Type: Capacity

This register reports the full capacity that goes with RepCap, generally used for reporting to the user. A new full-capacity

value is calculated at the end of every charge cycle in the application.

TTE Register (11h)

Register Type: Time

The TTE register holds the estimated time to empty for the application under present temperature and load conditions.

TTE register is only valid when current register is negative.

TTF Register (20h)

Register Type: Time

The TTF register holds the estimated time to full for the application under present conditions. The TTF value is

determined by learning the constant current and constant voltage portions of the charge cycle based on experience of

prior charge cycles. Time-to-full is then estimated by comparing the present charge current to the charge termination

current. Operation of the TTF register assumes all charge profiles are consistent in the application. The TTF register is

only valid when the current register is positive.

Cycles Register (17h)

Register Type: Special

The Cycles register maintains a total count of the number of charge/discharge cycles of the cell. The result is stored

as a fraction of a full cycle. For example, a full charge/discharge cycle results in the Cycles register incrementing by

100%. The Cycles register accumulates fractional or whole cycles. For example, if a battery is cycled 10% x 10 times,

then it is equivalent to 100% of one cycle. The Cycles register has a full range of 0 to 655.35 cycles with a 1% LSb.

Status Register (00h)

Register Type: Special

Initial Value: 0x8082

The Status register maintains all flags related to alert thresholds and battery insertion or removal. Table 7 shows the

Status register format.

Table 7. Status (00h) Format

D15

D14

D13

D12

D11

D10

D9

D8

D7

D6

D5

D4

D3

D2

D1

D0

Br

Smx

Tmx

Vmx

Bi

Smn

Tmn

Vmn

dSOCi

Imx

X

X

Bst

Imn

POR

X

POR (Power-On Reset): This bit is set to 1 when the device detects that a software or hardware POR event has

occurred. This bit must be cleared by system software to detect the next POR event. POR is set to 1 at power-up.

Imn and Imx (Minimum/Maximum Current-Alert Threshold Exceeded): These bits are set to 1 whenever a Current

register reading is below (Imn) or above (Imx) the IAlrtTh thresholds. These bits may or may not need to be cleared by

system software to detect the next event. See Config.IS bit description. Imn and Imx are cleared to 0 at power-up.

MAX17262

5.2μA 1-Cell Fuel Gauge with ModelGauge m5 EZ

and Internal Current Sensing

www.maximintegrated.com

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