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LDS8161/41
adjustment code for two 5oC temperature steps in its
lower (bits 3:0) and higher (bits 7:4) nibble. User
loadable de-rating codes in the 1x scale mode
represent 0 to -7 PWM de-rating steps. In the 2 x
scale mode the de-rating codes represent 0 to -14
PWM steps.
adjust the PWM duty cycle. Therefore this reduces
the av erage current through the LEDs as defined by
the LUT table.
The user loads specific ΔPWM de-rating codes into
the LUT (56h – 5Dh) for every 5oC temperature step
from 25oC to 100oC to meet desired current and
power vs. LED junction temperature.
LUT de-rating correction codes are subtracted from
the user-set duty cycle/dimming code (dynamic
mode) loaded in register 05h to maintain reliable LED
current levels.
The LDS8161/41 includes a 10-bit ADC and digital
processing engine to determine LED temperatures
approximately every 2.5 seconds. The proprietary
LED-Sense
TM
algorithm allows direct measurement of
LED junction temperatures on the LEDA1 driver
channel, without the need for an external temperature
sensor. Additionally an on-chip silicon temperature
sensing diode is also measured to enhance
temperature estimation accuracy.
I C Interface
The LDS8160 uses a 2-wire serial I C-bus interface.
The SDAT and SCLK lines comply with the I C
Figure 4: Dynamic Mode Dimming in Logarithmic
Mode in dB vs. register 05h data
(0dB dimming = full LED brightness)
Additionally, the ADC and processing circuits are
time-multiplexed to provide an LED opens and shorts
diagnostic feature.
A Factory loaded de-rating curve is valid upon reset,
and provide the de-rating profile shown at Figure 3.
2
2
2
electrical specification and should be terminated with
pull-up resistors to the logic voltage supply. When the
bus is not used, both lines are high. The device
supports a maximum bus speed of 400kbit/s. The
serial bit sequence is shown at
REGISTER
DEFINITION AND PROGRAMMING section for read
and write operations into the registers. Read and
write instructions are initiated by the master
controller/CPU and acknowledged by the slave LED
I C addresses by connecting SADD pin (#3) either to
Table 11: LDS8161/41 I C Slave Addresses
The LED-Sense
engine periodically measures the
5 C temperature intervals from -35 to +120 C.
SADD pin
I C Address
For further details on the I C protocol, please refer to
the I C-Bus Specification, document number 9398-
Figure 5: Dynamic Mode Dimming in Logarithmic
Mode in percent vs. register 05h data
(0% dimming = full LED brightness)
Additionally, the LED drivers are disabled (i.e. 0 DC
current) if the measured LED junction temperature
exceeds a preset value that is loaded in register 4Ah.
The default is set for 1Ch = 105oC Tj.
TM
LED junction temperature on channel LEDA1 and
encodes the value into 5-bit T-codes representing
0 0
The measured T-code value addresses the stored
Δ PWM de-rating codes stored in the LUT registers to
driver.
The LDS8161/41 allows user to choose between two
2
ground, or V IN pin (see Table ).
2
2
connected to Binary code Hex
Ground 001 0001 11h
V IN 101 0101 55h
2
2
393-40011, from Philips Semiconductors.
? 2009 IXYS Corp.
Characteristics subject to change without notice
14
Doc. No. 8141/61_DS, Rev. N1.0
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