ACT5880 datasheet(29/87 Pages) ACTIVE-SEMI

29 / 87 page

ACT5880

Rev 2, 03-Sep-13

- 29 -

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BLOCK

ADDRESS

and BIT

NAME

DEFAULT

and

ACCESS

DESCRIPTION

ODO3

0x76

ISCALE3[1]

W/R

Set the LSB weight of the linear current setting of the open-

drain driver. [1:0]=00 for 0.4mA, 01 for 0.8mA, 10 for 1.2mA, 11

for 1.6mA.

ISCALE3[0]

ISET3[5]

W/R

Driver output current setting in linear code, no offset.

[

5:0]=0 for 0mA output. Full scale output currents are 25.2mA,

50.4mA, 75.6mA and 100.8mA respectively with different LSB

weights.

ISET3[4]

ISET3[3]

ISET3[2]

ISET3[1]

ISET3[0]

0x77

DUTY3[7]

W/R

PWM duty setting. [7:0]=0x00 for 0%, [7:0]=0xFF for 100%.

For linear duty setting option, the LSB weight is 0.4% for code

0x00 to 0xFE, which is 0% to 99.2% of duty. The code 0xFF is

forced for 100% duty.

For the non-linear duty setting option, refer to the table of NON-

LINEAR DUTY SETTING for code to duty cross.

DUTY3[6]

DUTY3[5]

DUTY3[4]

DUTY3[3]

DUTY3[2]

DUTY3[1]

DUTY3[0]

ODO

0x79

THERMAL_OK

Driver circuit over temperature indicator. This bit is cleared to 0

if the driver circuit over temperature happens.

OK1

OK2

Indicator for ODO2 out current of regulation (open LED de-

tected).

OK3

RFU

BUFFER

W/R

Indicator for ODO1 out current of regulation (open LED de-

tected).

Indicator for ODO3 out current of regulation (open LED de-

tected).

Reserved for future use.

Set 1 to select data buffers. Buffered data is updated to each

output simultaneously when this bit is cleared to 0, for synchro-

nized output.

Note:

W/R: Write and read accessible. R: Read accessible, writing to the bit does not make change to the volume. WE/R: Write

and read accessible, write exact what it is before to avoid unexpected behavior. X is uncertain volume.

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