ACT5880 datasheet(34/87 Pages) ACTIVE-SEMI

34 / 87 page

ACT5880

Rev 2, 03-Sep-13

- 34 -

www.active-semi.com

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I2CTM is a trademark of NXP.

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BLOCK

ADDRESS

and BIT

NAME

DEFAULT

and

ACCESS

DESCRIPTION

0xC8

W/R

For internal use only.

W/R

For internal use only.

VSETBB[5]

W/R

Voltage setting for back-up battery charger, default 2.7V.

This byte only could be written when the UNLOCBB is set to 1.

Refer to the table of VBBAT VOLTAGE SETTINGS for details.

VSETBB[4]

VSETBB[3]

VSETBB[2]

VSETBB[1]

VSETBB[0]

0xC9

ONBB

W/R

Set 1 enable, set 0 disable the back-up battery charger.

ONRTC

W/R

Set 1 enable the always-on LDO, which powers the RTC block.

Set 0 disable the always-on LDO for saving power when not used.

RFU

WE/R Reserved for future use.

UNLOCKBB

W/R

Set 1 to allow change the back-up battery charger output voltage.

SCRATCH[3]

W/R

4 bits register for the equipment system to use. Data in those bits

are kept until both the main battery and back-up battery loses.

SCRATCH[2]

SCRATCH[1]

SCRATCH[0]

0xCA

W/R

For internal use only.

W/R

For internal use only.

VSETRTC[5]

W/R

Always-on LDO output voltage setting, default is 1.8V.

Refer to the STEP-DOWN DC/DC AND LDO OUTPUT VOLT-

AGE SETTING

table for details.

VSETRTC[4]

VSETRTC[3]

VSETRTC[2]

VSETRTC[1]

VSETRTC[0]

CHG

0xD0

VSET[3]

W/R

Battery regulation voltage setting for the voltage output in the top-

off state. The ENVISET[ ] has to be set to 1 for changing these

bits.

Refer to the table of CHARGER VOLTAGE SETTING for details.

VSET[2]

VSET[1]

VSET[0]

ISET[3]

W/R

Fast charge current setting for the maximum current for fast

charge. The ENVISET[ ] has to be set to1 for changing these bits.

Refer to the table of FAST CHARGING CURRENT SETTING for

details.

ISET[2]

ISET[1]

ISET[0]

BBU

Note:

W/R: Write and read accessible. WE/R: Write and read accessible, write exact what it is before to avoid unexpected

behavior. X is uncertain volume.

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