ISL6424 Datasheet, PDF (10/12 Pages) Intersil Corporation – Dual Output LNB Supply and Control Voltage Regulator with I2C Interface for Advanced Satellite Set-Top Box Designs

ISL6424
System Register Format
• R, W = Read and Write bit
• R = Read-only bit
• All bits reset to 0 at Power-On
R, W
SR1
R, W
DCL
TABLE 3. SYSTEM REGISTER 1 (SR1)
R, W
R, W
R, W
ISEL1
ENT1
LLC1
R, W
VSEL1
R, W
EN1
R
OLF1
R, W
SR2
R, W
ISEL2
TABLE 4. SYSTEM REGISTER 2 (SR2)
R, W
R, W
R, W
ENT2
LLC2
VSEL2
R, W
EN2
R
OTF
R
OLF2
Transmitted Data (I²C bus WRITE mode)
When the R/W bit in the chip is set to 0, the main
microprocessor can write on the system registers (SR1/SR2)
of the ISL6424 via I²C bus. These will be written by the
microprocessor as shown below. The spare bits of SR1/SR2
can be used for other functions.
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
X
X
X
X
1
X Dynamic current limit NOT selected
0
0
X
X
X
X
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
X
X
X
X
X
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.
10
FN9175.3
September 13, 2005