LP3921 datasheet(23/41 Pages) TI1

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VTERM

50 mA

3.0V

Prequalification to Fast

Charge transition

Transition to Constant

Voltage-mode

Charging current

EOC

1.0 C

Maintenance charging

starts

Time

VRSTRT

Charging current

LP3921

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SNVS580A – AUGUST 2008 – REVISED MAY 2013

Figure 7. Charge Cycle Diagram

Further Charger Register Information

CHARGER CONTROL REGISTER 1

Table 14. Register Address 8h'10: CHGCNTL1

BIT

NAME

FUNCTION (if bit = '1')

USB_MODE

Sets the Current Level in USB mode.

_EN

CHG_MODE

Forces the charger into USB mode when active high.

_EN

If low, charger is in normal charge mode.

FORCE

Forces an EOC event.

_EOC

TOUT_

Doubles the timeout delays for all timeout signals.

Doubling

EN_Tout

Enables the timeout counters. When set to '0' the timeout counters

are disabled.

EN_EOC

Enables the End of Charge current level threshold detection.

When set to '0' the functions are disabled.

Set_

Forces the charger into LDO mode.

LDOmode

EN_CHG

Charger enable.

Table 15. Register Address 8h'13: CHGSTATUS1

BIT

NAME

FUNCTION (if bit = '1')

BAT_OVER

Is set when battery voltage exceeds 4.7V.

_OUT

CHGIN_

Is set when a valid input voltage is detected at CHG_IN pin.

OK_Out

EOC

Is set when the charging current decreases below the

programmed End Of Charge level.

Tout_

Set after timeout on full rate charge.

Fullrate

Tout_

Set after timeout for precharge mode.

Precharge

LDO_Mode

This bit is disabled in LP3921. Contact NSC sales if this option is

required as in LP3918–L.

Fullrate

Set when the charger is in CC/CV mode.

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