Rainbow-electronics DS2788 Manual de usuario descargar pdf (Pagina 17)

The Status register contains bits that report the device

status. The bits can be set internally by the DS2788.

The CHGTF, AEF, SEF, LEARNF, and VER bits are

read-only bits that can be cleared by hardware. The

UVF and PORF bits can only be cleared through the 1-

Wire interface.

DS2788

Stand-Alone Fuel-Gauge IC with

LED Display Drivers

______________________________________________________________________________________ 17

ADDRESS 01h BIT DEFINITION

Field Bit Format Allowable Values

CHGTF 7 Read Only

Charge Termination Flag

Set to 1 when: (VOLT > VCHG) and (0 < IAVG < IMIN) continuously for a period

between two IAVG register updates (28s to 56s).

Cleared to 0 when: RARC < 90%

AEF 6 Read Only

Active Empty Flag

Set to 1 when: VOLT < VAE

Cleared to 0 when: RARC > 5%

SEF 5 Read Only

Standby Empty Flag

Set to 1 when: RSRC < 10%

Cleared to 0 when: RSRC > 15%

LEARNF 4 Read Only

Learn Flag—When set to 1, a charge cycle can be used to learn battery capacity.

Set to 1 when: (VOLT falls from above VAE to below VAE) and (CURRENT > IAE)

Cleared to 0 when: (CHGTF = 1) or (CURRENT < 0) or (ACR = 0**) or (ACR

written or recalled from EEPROM) or (SLEEP Entered).

Reserved 3 Read Only Undefined

UVF 2 Read /Write*

Undervoltage Flag

Set to 1 when: VOLT < V

SLEEP

Cleared to 0 by: User

PORF 1 Read/Write*

Power-On Reset Flag—Useful for reset detection, see text below.

Set to 1 when: upon power-up by hardware.

Cleared to 0 by: User

Reserved 0 Read Only Undefined

*This bit can be set by the DS2788, and can only be cleared through the 1-Wire interface.

**LEARNF is only cleared if ACR reaches 0 after VOLT < VAE.

Figure 14. Status Register Format

Calculation of Results

RAAC [mAh] = (ACR[mVh] - AE(T) × FULL50[mVh]) × RSNSP [mhos]

RSAC [mAh] = (ACR[mVh] - SE(T) × FULL50[mVh]) × RSNSP [mhos]

RARC [%] = 100% × (ACR[mVh] - AE(T) × FULL50[mVh]) / {(AS × FULL(T) - AE(T)) × FULL50[mVh]}

RSRC [%] = 100% × (ACR[mVh] - SE(T) × FULL50[mVh]) / {(AS × FULL(T) - SE(T)) × FULL50[mVh]}

Status Register

1 2 ... 12 13 14 15 16 17 18 19 20 21 22 ... 29 30

LED Display Drivers 1

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Rainbow-electronics DS2788 Manual de usuario Pagina 17

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