Rainbow-electronics DS2781 Manual de usuario descargar pdf (Pagina 18)

DS2781: Two-Cell Standalone Fuel Gauge IC

18 of 30

STATUS REGISTER

The STATUS register contains bits that report the device status. The bits can be set internally by the DS2781. 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 via the 1-Wire interface.

Figure 14. Status Register Format

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 Flag¾When 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 Flag¾Useful for reset detection, see text below.

Set to 1 upon Power-Up by hardware.

Cleared to 0 by: User

Reserved 0 Read Only Undefined

* - This bit can be set by the DS2781, and may only be cleared through the 1-Wire interface.

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

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Rainbow-electronics DS2781 Manual de usuario Pagina 18

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