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LDS8161/41
Table 8: LDS8161 / 41 Temperature De-rating LUT Register Allocation
(data stored is ? PWM code per each temperature point)
Data bits
Data bits
Register
7 –4
3– 0
Register
7–4
3–0
temperature, C
temperature, C
Address
ΔPWM code for
0
Address
ΔPWM code for
0
56h
57h
58h
59h
30
40
50
60
25
35
45
55
5Ah
5Bh
5Ch
5Dh
70
80
90
100
65
75
85
95
Table 9: Valid Δ PWM Codes vs. Number of Adjustment Steps for LDS8161/ 41 De-rating
Number of
steps
Not Used
-7
-6
-5
Binary
Code
1000
1001
1010
1011
Number of
steps
-4
-3
-2
-1
Binary
Code
1100
1101
1110
1111
Number of
steps
0
Not Used
Not Used
Not Used
Binary
Code
0000
0001
0010
0011
Number of
steps
Not Used
Not Used
Not Used
Not Used
Binary
Code
0100
0101
0110
0111
PROGRAMMING EXAMPLES
Set LEDs in shutdown mode at junction temperature above 100 C
Operation
Set 20 mA current at Bank LEDA
Set 30 mA at LEDA, 30 mA at LEDB, & 20 mA at LEDC banks
Turn LEDs A1, B1 and C1 on, all others off
Turn LEDs A2, B2, and C2 on, all others off
Turn all LEDs on
Set Bank A,B,C PWM duty Cycle at 50% (-6 dB)
Disable Temperature De-rating (DT_Adjust_disable)
Re-Enable Temperature De-rating
Short/open LED diagnostic request
Read out LED short to GND status
Read out LED short to V IN /open status
Set Standby Mode
Resume normal operation from standby mode
Calibration request (conduct temperature calibration)
Set Ta-Tj offset for LED and Si Diode to -20oC
Software Reset (to default values) and/or clear of all registers
0
Register
Address
00h
00h
03h
03h
03h
05h
1Eh
1Eh
19h
1Ch
1Dh
1Fh
1Fh
1Fh
4Ah
49h
1Fh
Register Data
A0h
F0h F0h A0h
15h
24h
3Fh
DCh
04h
00h
20h
40h
00h
10h
1Bh
CCh
80h
Command
(hex)
XX 00 A0
XX F0 F0 A0
XX 03 15
XX 03 24
XX 03 3F
XX 05 DC
XX 1E 04
XX 1E 00
XX 19 20
XX 1C YY
XX 1D YY
XX 1F 40
XX 1F 00
XX 1F 10
XX 4A 1B
XX 49 CC
XX 1F 80
Note:
XX – The LDS8160 I 2 C customer-selected slave address followed by binary 1 for write command, i.e. if I 2 C slave address is
001 0001 (see Table 8), XX = 0010 0011 (bin) = 23h
YY – The LDS8160 I 2 C customer-selected slave address followed by binary 0 for read command, i.e. if I 2 C slave address is
001 0001 (see Table 8), YY = 0010 0010 (bin) = 22h
? 2009 IXYS Corp.
Characteristics subject to change without notice
9
Doc. No. 8141/61_DS, Rev. N1.0
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