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LDS8160 Datasheet(PDF) 17 Page - IXYS Corporation

Part No. LDS8160
Description  Dual-Output RGB / 6-Channel WLED Driver
Download  39 Pages
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Manufacturer  IXYS [IXYS Corporation]
Direct Link  http://www.ixys.com
Logo IXYS - IXYS Corporation

LDS8160 Datasheet(HTML) 17 Page - IXYS Corporation

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LDS8160
© 2009 IXYS Corp.
17
Doc. No. 8160_DS, Rev. N1.0
Characteristics subject to change without notice
Figure 10: Example LDS8160 Accumulated PWM
Correction Curves for Nichia NSMM038AT-E RGB
LED for ILED nominal (R, G, & B) = 15 mA @ 25ºC
Appendix 1 describes how to generate PWM LUT
correction profiles. Additionally software tools and
support is available from the factory to assist
customers to generate LUT tables for specific LEDs
and applications. Please consult the factory or a
sales representative.
Global Dimming Limitations
The final PWM dimming code value is the algebraic
sum of three codes: Dynamic Dimming code, Global
Dimming Code, and the Temperature Compensation
Code. If this sum is equal to or below zero, the LED
in that particular channel is disabled. It means that
the Global Dimming dynamic range is limited by
Dynamic Dimming and the Temperature Correction
Table used.
As an example:
If the user set PWM Dynamic Dimming in a particular
channel is set to -20 dB (registers 05h – 07h data =
code 143 (dec)) and the LED-Sense
TM Temperature
vs. PWM Correction requires 7 steps correction
dimming (data code 7 (dec)), the resultant allowable
additional Global Dimming range = 143 – 7 = 136
(dec) steps or ~ - 23.1 dB.
I
2C Interface
The LDS8160 uses a 2-wire serial I
2C-bus interface.
The SDAT and SCLK lines comply with the I
2C
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
CONFIGURATION 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
driver.
The LDS8160 allows user to choose between one of
four preprogrammed I
2C addresses by connecting
SADD pin (#3) either to ground, SCLK, SDAT or VIN
pin (see Table 10). Consult factory about other
addresses available.
Table 10: LDS8160 I
2C Slave Addresses
I
2C Address
SADD pin
connected to
Binary code
Hex
Ground
001 0001
11h
SCLK
001 0101
15h
SDAT
101 0001
51h
VIN
101 0101
55h
For further details on the I
2C protocol, please refer to
the I
2C-Bus Specification, document number 9398-
393-40011, from Philips Semiconductors.
Recommended User Register Initialization
Table 11 is provided as a recommended user I2C
register initialization and calibration sequence for the
the LDS8160 for an RGB LED application. RED
values in the table mean these registers are
user/system dependent. Any values shown are for
example only.
Unused LED Channels
For applications with less than six white or two RGB
LEDs, unused LED banks can be disabled via the I
2C
interface by addressing register 03h with data that
represent
desired
combination
of
LEDs
turned
ON/OFF (see Table 1).
The LDS8160 unused LED outputs can be left open.
LED short/open protection
The LDS8160 runs a LED short/open diagnostic
routine upon the power up sequence. It detects both
LED pins shorted to ground and LED pins that are
open or shorted to VIN (fault conditions).
The results for short to GND detection are stored in
Diagnostics Register 1Ch. Bits from bit 5 to bit 0
indicate a short status as bit = 1 for LEDC2 - LEDA1
respectively, if the corresponding bit in the LED
Faults detection Diagnostics register, 1Dh, is also
High=1. A short to GND is detected if the measured
LED pin voltage is less than ~ 0.14 V independent of
the
programmed
LED
current.
Every
channel
detected as shorted, is disabled


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