Rainbow-electronics MAX17047 Manual do Utilizador descarregar pdf (Página 27)

�� Maxim Integrated Products 27

MAX17047

ModelGauge m3 Fuel Gauge

Power-Up and Power-On Reset

Any power-on reset (POR) of the device resets all

memory locations to their default POR value. This

removes any custom cell characterization and applica-

tion data, affects ALRT interrupt and shutdown mode set-

tings, and resets all learned adjustments made by the fuel

gauge. To maintain accuracy of the fuel gauge and reset

operation settings of the device, the host must reload

all application memory data and restore all learned fuel-

gauge information. Note that the device may take up to

445ms to completely reset operation after a POR event

occurs. See Figure 36. Saved data should not be restored

until after this period is over. The following procedure is

recommended:

1) Read Status register. If POR = 0, exit.

2) Wait 600ms for POR operation to fully complete.

3) Restore all application register values.

4) Restore fuel gauge learned-value information (see the

Save and Restore Registers section).

5) Clear POR bit.

Save and Restore Registers

The device is designed to operate outside the battery

pack and can therefore be exposed to power loss when

in the application. To prevent the loss of learned informa-

tion during power cycles, a save-and-restore procedure

can be used to maintain register values in nonvolatile

memory external to the device. The registers (Table 2)

must be stored externally and then rewritten to the device

after power-up to maintain a learned state of operation.

Table 2. Save and Restore Registers

Figure 36. Power-Up Operation

FullCap 10h

Cycles 17h

RCOMP0 38h

TempCo 39h

QResidual 00 12h

QResidual 10 22h

QResidual 20 32h

QResidual 30 42h

dQacc 45h

dPacc 46h

AIN

BATT

A/D

READINGS

OUTPUT

REGISTERS

1.4s UNTIL NEXT TEMPERATURE READING

270ms

175ms

CELL

INSERTION

BATT

> V

DDMIN

A/D

MEASUREMENTS

COMPLETE

SOC VALUES

UPDATED

1 2 ... 22 23 24 25 26 27 28 29 30 31 32 ... 45 46

MAX17047 1
ModelGauge m3 Fuel Gauge 1

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