MAX1996AETI+ Maxim Integrated Products, MAX1996AETI+ Datasheet - Page 26

• Manufacturer Part Number: MAX1996AETI+
• Description: Display Drivers CCFL Backlight Controller
• Manufacturer: Maxim Integrated Products

Specifications of MAX1996AETI+

• Lead Free Status / Rohs Status: Details

High-Efficiency, Wide Brightness
Range, CCFL Backlight Controller
Table 8. SHMD Register Bit Descriptions
Table 10. Status Register Bit Descriptions (Read Only/Writes Have No Effect)
duration of the following digital PWM period. If an over-
current condition is not detected in any given digital
PWM period, STATUS0 is set for the duration of the fol-
lowing digital PWM period. Forcing the CCFL lamp off
by entering shutdown, writing to the mode register, or
by toggling SHB/SUS sets STATUS1. Note that the sta-
tus register bit assignment of command byte 0xA9 is
inverted from the bit assignment of command byte 0x80.
26
X = Don’t care.
Table 9. SH/SUS and SHMD Register Truth Table
BIT
BIT
2
1
0
1
0
______________________________________________________________________________________
SH/SUS
0
0
1
1
X
STATUS1
STATUS0
SHMD2
SHMD1
SHMD0
NAME
NAME
STATE
STATE
POR
POR
0
0
1
SHMD2
1
1
0
0
0
0
1
SHMD2 = 1 forces the lamp off and sets STATUS1. SHMD2 = 0 allows the lamp to operate
although it may still be shut down by the /SH\/SUS pin (depending on the state of SHMD1
and SHMD0).
When SH/SUS = 0, this bit has no effect. SH/SUS = 1 and SHMD1 = 1 forces the lamp off
and sets STATUS1. SH/SUS = 1 and SHMD1 = 0 allows the lamp to operate although it
may still be shut down by the SHMD2 bit.
When SH/SUS = 1, this bit has no effect. SH/SUS = 0 and SHMD0 = 1 forces the lamp off
and sets STATUS1. SH/SUS = 0 and SHMD0 = 0 allows the lamp to operate although it
may still be shut down by the SHMD2 bit.
STATUS1 = zero means that a lamp-out condition has been detected. The STATUS1 bit
stays clear even after the lamp-out condition has gone away. The only way to set STATUS1
is to shut off the lamp by programming the mode register or by toggling SHB/SUS.
STATUS0 = zero means that an overcurrent condition was detected during the previous
digital PWM period. STATUS0 = 1 means that no overcurrent condition was detected
during the previous digital PWM period.
SHMD1
X
X
0
1
X
The ID registers return information on the manufacturer,
the chip ID, and the chip revision number. The
MAX1996A is the first-generation advanced CCFL con-
troller and its ChipRev is 0x00. Reading from MfgID
register returns 0x4D, which is the ASCII code for M
(for Maxim), the ChipID register returns 0x0C. Writing to
these registers has no effect.
TRANSISTOR COUNT: 7364
DESCRIPTION
DESCRIPTION
SHMD0
X
X
X
0
1
Chip Information
Operate
Shutdown, STATUS1 set
Operate
Shutdown, STATUS1 set
Shutdown, STATUS1 set
OPERATING MODE
ID Registers