Datasheet

MAX1739/MAX1839
†
Wide Brightness Range
CCFL Backlight Controllers
______________________________________________________________________________________ 23
Brightness Register
[BRIGHT4–BRIGHT0] (POR = 0b10111)
The 5-bit brightness register corresponds with the 5-bit
brightness code used in the dimming control (see
Dimming Range). BRIGHT4–BRIGHT0 = 0b00000 sets
minimum brightness, and BRIGHT4–BRIGHT0 =
0b11111 sets maximum brightness. The SMBus inter-
face does not control whether the device regulates the
current by analog dimming, DPWM dimming, or both;
this is done by MINDAC (Table 2).
Shutdown-Mode Register
[SHMD2–SHMD0] (POR = 0b001)
The 3-bit shutdown-mode register configures the oper-
ation of the device when the SH/SUS pin is toggled as
described in Table 7. The shutdown-mode register can
also be used to shut off directly the CCFL, regardless
of the SH/SUS state (Table 8).
DATA REGISTER BIT ASSIGNMENT
R OR W
PROTOCOL
COMMAND
BYTE*
POR
STATE
BIT 7
(MSB)
BIT 6 BIT 5 BIT 4 BIT 3 BIT 2 BIT 1
BIT 0
(LSB)
Read and
Write
0x01
0b0XXX
XX01
0x17
000
BRIGHT4
(MSB)
BRIGHT3 BRIGHT2 BRIGHT1
BRIGHT0
(LSB)
Read and
Write
0x02
0b0XXX
XX10
0xF9 STATUS1 STATUS0
111
SHMD2 SHMD1
SHMD0
Read
Only
0x03
0b0XXX
XX11
0x96
ChipID7
1
ChipID6
0
ChipID5
0
ChipID4
1
ChipID3
0
ChipID2
1
ChipID1
1
ChipID0
0
Read
Only
0x04
0b0XXX
XX00
0x00
ChipRev7
0
ChipRev6
0
ChipRev5
0
ChipRev4
0
ChipRev3
0
ChipRev2
0
ChipRev1
0
ChipRev0
0
Read and
Write
0x40
0b10XX
XXXX
0xBF
BRIGHT4
(MSB)
BRIGHT3 BRIGHT2 BRIGHT1
BRIGHT0
(LSB)
1
STATUS1
STATUS0
Read
Only
0xFE
0b11XX
XXX0
0x4D
MfgID7
0
MfgID6
1
MfgID5
0
MfgID4
0
MfgID3
1
MfgID2
1
MfgID1
0
MfgID0
1
Read
Only
0xFF
0b11XX
XXX1
0x96
ChipID7
1
ChipID6
0
ChipID5
0
ChipID4
1
ChipID3
0
ChipID2
1
ChipID1
1
ChipID0
0
*The hexadecimal command byte shown is recommended for maximum forward compatibility with future MAXIM products.
Table 6. Commands Description