10

FN9175.3

September 13, 2005

System Register Format

• R, W = Read and Write bit

• R = Read-only bit

When the R/W bit in the chip is set to 0, the main

microprocessor can write on the system registers (SR1/SR2)

microprocessor as shown below. The spare bits of SR1/SR2

can be used for other functions.

TABLE 3. SYSTEM REGISTER 1 (SR1)

R, W

R, W

R, W

R, W

R, W

R, W

R, W

R

SR1

DCL

ISEL1

ENT1

LLC1

VSEL1

EN1

OLF1

TABLE 4. SYSTEM REGISTER 2 (SR2)

R, W

R, W

R, W

R, W

R, W

R, W

R

R

SR2

ISEL2

ENT2

LLC2

VSEL2

EN2

OTF

OLF2

TABLE 5. SYSTEM REGISTER (SR1 AND SR2) CONFIGURATION

SR

DCL

ISEL1

ENT1

LLC1

VSEL1

EN1

OLF1

FUNCTION

0

X

X

X

0

0

X

X

SR1 is selected

0

X

X

X

0

0

1

X

Vout1 = 13V, Vboost1 = 13V + Vdrop

0

X

X

X

0

1

1

X

Vout1 = 18V, Vboost1 = 18V + Vdrop

0

X

X

X

1

0

1

X

Vout1 = 14V, Vboost1 = 14V + Vdrop

0

X

X

X

1

1

1

X

Vout1 = 19V, Vboost1 = 19V + Vdrop

0

X

X

0

X

X

1

X

22kHz tone is controlled by DSQIN1 pin

0

X

X

1

X

X

1

X

22kHz tone is ON, DSQIN1 is disabled

0

X

0

X

X

X

1

X

Iout1 = 425mA max.

0

X

1

X

X

X

1

X

Iout1 = 775mA max.

0

1

XX

XX

1

X

Dynamic current limit NOT selected

0

0

XX

XX

1

X

Dynamic current limit selected

0

X

X

X

X

X

0

X

PWM and Linear for channel 1 disabled

SR

ISEL2

ENT2

LLC2

VSEL2

EN2

OTF

OLF2

FUNCTION

1

X

XX

XXX

X

SR2 is selected

1

X

X

0

0

1

X

X

Vout2 = 13V, Vboost2 = 13V + Vdrop

1

X

X

0

1

1

X

X

Vout2 = 18V, Vboost2 = 18V + Vdrop

1

X

X

1

0

1

X

X

Vout2 = 14V, Vboost2 = 14V + Vdrop

1

X

X

1

1

1

X

X

Vout2 = 19V, Vboost2 = 19V + Vdrop

1

X

0

X

X

1

X

X

22kHz tone is controlled by DSQIN2 pin

1

X

1

X

X

1

X

X

22kHz tone is ON, DSQIN2 is disabled

1

0

X

X

X

1

X

X

Iout2 = 425mA max.

1

1

X

X

X

1

X

X

Iout2 = 775mA max.

1

X

X

X

X

0

X

X

PWM and Linear for channel 2 disabled

NOTE: OTF and OLF1&2 are “Read Only” bits and X is a “Don’t Care” for the function specified.

ISL6424