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LDS8160
ADDRESS
19h
DESCRIPTION
Digital Test Mode
BITS
8
NOTES
See Table 2; Bit 5 = 1 sets user-initiated LED short/open
diagnostic
Bits from bit 5 to bit 0 represent LED status for LEDC2 –
LEDA1 respectively. Bit = 1 represents LED shorted to GND
1Ch
LED shorted to GND
6
When the corresponding bit in the “faults” detection register,
1Dh, is also High=1, and the associated LED driver current is
disabled.
Bits from bit 5 to bit 0 represent LED status for LEDC2 –
`
1Dh
LED Fault Detected
(LED shorted to V IN or
open)
6
LEDA1 respectively. Bit = 1 represents that an LED Fault is
detected. If the corresponding bit in register 1Ch is also High
=1, than the LED is shorted to ground and current driver is
disabled. If the corresponding bit in register 1Ch is Low=0 than
the LED is either shorted to V IN or open
1Eh
1Fh
Configuration register
Software reset, Standby
8
8
See Table 3
See Table 4
Two 4-bit compensation offsets between Ta and Tj:
Bit [7:4] = temperature offsets for LED temperature
Each LSB = 5°C; temperature adjustment range from -40 C to
+35 C
49h
Ta-Tj Temperature
Offset
8
Bit [3:0] = temperature offset for Silicon diode temperature
0
0
Code 1000 in either nibble = -40oC offset; Code 0111 in either
nibble = +35oC offset. See Tables 5 and 6
value = 11100 (bin) = 1Ch represents 105 C.
4Ah
LED shutdown
Temperature
5
Defines T-code, at which LED current shuts down per LED
vendor de-rating specification (see Table 7); Factory default
0
Bit 5 = 1 – enable 2- x scale LUT ΔPWM code correction (de -
rating) starting at the breakpoint set by T-code (bits 4:0)
4Bh
2-x Table enable and
breakpoint (T-code)
6
Bit 5 = 0 – 1-x scale (default) for entire temperature range
Bit [4:0] defines T-code, where temperature derating starts, or
where 2-x scaling begins (see Table 7)
1-x scale is ~ ± 0.17dB per step
2-x scale is ~ ± 0.34dB per step
Two LUT words per I C address.
LUT-B
ΔPWM code1[7:4],
2
Each word contains two 4- bit numbers representing of ΔPWM
50h – 5Fh
60h – 6Fh
ΔPWM code0[3:0] –
ΔPWM code31[7:4],
ΔPWM code30[3:0]
LUT-G
ΔPWM code1[7:4],
ΔPWM code0[3:0] –
8
8
codes.
See Table 8 and Appendix 1 for LUT programming.
Coding is different for Logarithmic and Linear Modes.
See above:
ΔPWM code31[7:4],
ΔPWM code30[3:0]
LUT-R
ΔPWM code1[7:4],
70h – 7Fh
ΔPWM code0[3:0] –
ΔPWM code31[7:4],
ΔPWM code30[3:0]
8
See above:
Silicon diode V F temperature coefficient :
Factory recommended value = -1.71 mV/°C = 001 10110
(bin) = 36h,
A0h
Silicon diode dV F /dT [7:0]
8
where bits from bit 7 to bit 5 represent integer part [1(decimal)
= 001 (bin)], and bits from bit 4 to bit 0 – fractional part [0.710 /
0.03125 = 22 (decimal) = 10110 (bin)]
? 2009 IXYS Corp.
Characteristics subject to change without notice
7
Doc. No. 8160_DS, Rev. N1.0
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