Rainbow-electronics MAX17047 Manual do Utilizador descarregar pdf (Página 22)

�� Maxim Integrated Products 22

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

> 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. Figure 27 shows the ICHGTerm

power-up.

V_empty Register (3Ah)

The V_empty register sets thresholds related to empty

detection during operation. Figure 28 is the V_empty

: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.

: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.

Figure 27. ICHGTerm Register Format (Input)

Figure 28. V_empty Register Format (Input)

MSB—ADDRESS 1Eh LSB—ADDRESS 1Eh

S 2

MSb LSb MSb LSb

UNITS: 1.5625FV/R

SENSE

MSB—ADDRESS 3Ah LSB—ADDRESS 3Ah

MSb LSb MSb LSb

UNITS: 40mV

UNITS: 10mV

1 2 ... 17 18 19 20 21 22 23 24 25 26 27 ... 45 46

MAX17047 1
ModelGauge m3 Fuel Gauge 1

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