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ISL6422B Datasheet, PDF (13/18 Pages) Intersil Corporation – Dual Output LNB Supply and Control Voltage Regulator with I2C Interface for Advanced Satellite Set-Top Box Designs
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ISL6422B
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 thru
SR8) of the ISL6422B via I2C bus. These will be written by
the microprocessor as shown below. The spare bits of
registers can be used for other functions.
SR1H
0
0
0
0
0
0
0
0
0
0
0
SR1M
0
0
0
0
0
0
0
0
0
0
0
SR1L
0
0
0
0
0
0
0
0
0
0
0
OTF
X
X
X
X
X
X
X
X
X
0
1
TABLE 11. STATUS REGISTER SR1 CONFIGURATION
CABF1 OUVF1 OLF1 BCF1
FUNCTION
X
X
X
X SR1 is selected
X
X
0
X IOUT ≤ set limit, Normal Operation
X
X
1
X IOUT > Static/Dynamic Limiting Mode/Power blocks disabled
X
X
X
0 IOBCK ≤ set limit, Normal Operation
X
X
X
1 IOBCK > Dynamic Limiting Mode/Power blocks disabled
X
0
X
X VIN/VOUT within specified range
X
1
X
X VIN/VOUT is not within specified range
0
X
X
X Cable is connected, IO is > 20mA
1
X
X
X Cable is open, IO < 2mA
X
X
X
X TJ ≤ +130°C, Normal operation
X
X
X
X TJ > +150°C, Power blocks disabled
TABLE 12. TONE REGISTER SR2 CONFIGURATION
SR2H SR2M SR2L ENT1 MSEL1 TTH1
X
X
FUNCTION
0
0
1
X
X
X
X
X SR2 is selected
0
0
1
0
0
X
X
X Int Tone = 22kHz, modulated by EXTM , tr, tf = 10µs typ
0
0
1
0
1
X
X
X Ext 22k modulated input, tr, tf = 10µs typ
0
0
1
1
0
X
X
X Int Tone = 22kHz, modulated by ENT bit, tr, tf = 10µs typ
0
0
1
X
X
0
X
X TXT = 0; Decoder Rx threshold is set at 200mV max
0
0
1
X
X
1
X
X TXT = 0; Decoder Tx threshold is set at 400mV min
NOTE: X indicates “Read Only” and is a “Don’t Care” for the Write mode.
TABLE 13. COMMAND REGISTER SR3 CONFIGURATION
SR3H SR3M SR3L DCL1 VSPEN1 ISEL1R ISEL1H ISEL1L
FUNCTION
0
1
0
X
X
X
X
X SR3 is selected
0
1
0
0
X
0
X
X IOUT1 limit threshold = 305mA typ
0
1
0
0
X
1
0
0 IOUT1 limit threshold = 388mA typ
0
1
0
0
X
1
0
1 IOUT1 limit threshold = 570mA typ
0
1
0
0
X
1
1
0 IOUT1 limit threshold = 705mA typ
0
1
0
0
X
1
1
1 IOUT1 limit threshold = 890mA typ
0
1
0
1
X
X
X
X Dynamic current limit NOT selected
0
1
0
0
X
X
X
Dynamic current limit selected
0
1
0
X
0
X
X
X SELVTOP H/W pin Enabled
0
1
0
X
1
X
X
X SELVTOP H/W pin Disabled
NOTE: X indicates “Read Only” and is a “Don’t Care” for the Write mode.
13
FN6486.1
August 10, 2007
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