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LDS8161/41
which the customer may set by I C interface
In the Standby Mode, the I C interface remains active
STANDBY MODES
The LDS8161/41 has a “soft” standby or sleep mode,
2
addressing register 1Fh with bit 6 = 1 (see Table 4).
2
and all registers retain their programmed information.
In Standby Mode the LED drivers and internal clock
The LDS8161/41 wakes up from shutdown mode with
factory-preset default data. To preserve customer-
programmed data, use Normal standby mode.
PROGRAMMING MODES
The LDS8161/41 is factory preprogrammed with a
default temperature de-rating LUT that works with the
Nichia NSSW020BT WLEDs or equivalent. However,
specific LEDs and other user system conditions may
are powered off; however, internal regulators and
require user programming of
the
temperature
I C interface communications. This results in standby
should
conduct an
I C calibration
sequence
reference circuits remain active to insure power to the
digital sections to hold register values and maintain
2
current ~ 125 μA typical. For this mode, the EN pin
should be logic HIGH with signal level from 1.3 to V IN
voltage.
SHUTDOWN MODE
To set LDS8161/41 into the shutdown mode, the EN
pin should be logic low more than 10 ms. The
LDS8161/41 shutdown current is less than 1 μA.
compensation LUTs and other LED specific
parameters.
After initialization and user programming the user
2
command by writing Bit 4 = 1 in the Control register
1Fh. This conducts a real time calibration of the initial
starting temperature and actual LED parameters.
Upon completion, Bit 4 will be internally reset to 0,
and the LDS8161/41 is ready for use.
? 2009 IXYS Corp.
Characteristics subject to change without notice
16
Doc. No. 8141/61_DS, Rev. N1.0
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