LP3918TLSLASHNOPB datasheet(24/38 Pages) TI2

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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

LP3918

SNVS476D – AUGUST 2007 – REVISED MAY 2013

www.ti.com

Figure 11. 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. Function available on

LDOmode

LP3918TL_L.

EN_CHG

Charger enable.

Charger Status Register 1 Read only

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 levlel.

Tout_

Set after timeout on full rate charge.

Fullrate

Tout_

Set after timeout for precharge mode.

Precharge

LDO_Mode

Only available on LP3918TL_L.

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