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LDS8161/41
Silicon diode V F temperature coefficient (K factor) :
Factory recommended loaded value is 36h = -1.71 mV/°C =
A0h
Silicon diode dV F /dT [7:0]
8
001 10110 (bin),
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)]
User-loaded V F temperature coefficient @ 1mA for LEDs
used at Banks A, B, C respectively.
Negative tracking is assumed with temperature;
Bits from bit 7 to bit 5 represent integer part and
Example: Temperature coefficient = -2.26 mV/ C;
A2h
LED dV F /dT [7:0]
8
bits from bit 4 to bit 0 - fractional part of the coefficient
0
Bit 7 – bit 6 = 2 (decimal) = 010 (bin), and
Bit 4 – bit 0 = INT{0.26 / 0.03125} = 8 (decimal) = 01000 (bin)
User loads 010 01000 (bin) = 48h = -2.25 (closest setting)
Silicon diode η (eta , or non-ideality factor):
Factory recommended loaded value is default is 1.00 =
01000000(bin) = 40h
Bits from bit 7 to bit 5 represent integer part and
C0h
Silicon diode η [7:0]
8
bits from bit 4 to bit 0 - fractional part (resolution = 0.015625
per LSB)
Example: η = 1.00 ;
Bit 7 – bit 6 = 1 (decimal) = 01 (bin), and
Bit 5 – bit 0 = INT{0.00 / 0.015625} = 0 (dec) = 000000 (bin)
User loads 01 000000 = 40h = 1.00
Formula (decimal) = 8192 x [(68 ohms x 8 x 10 A)/1.14 V]
D4h
Silicon diode R s offset
[7:0]
8
Silicon diode series resistance offset
Factory recommended loaded value = 04h = ~ 68 ohms
-6
LED Rs offset (user-loaded) for Banks A, B, and C LEDs
Typically LED Rs = 5 – 30 Ω
D6h
LED Rs offset [7:0]
8
User loads per LED used. (1/slope of high current region of
Formula (decimal) = 8192 x [(Rs Ω x 8 x 10 A) / 1.14V]
LED I-V characteristic).
-4
Table 1
Register
Channel Enable Register
Address
03h
(8161)
(8141)
Bit 7
LED
OT
Flag
Same
Bit 6
N/A
N/A
Bit 5
Enable C2
N/A
Bit 4
Enable C1
N/A
Bit 3
Enable B2
Same
Bit 2
Enable B1
Same
Bit 1
Enable A2
Same
Bit 0
Enable A1
Same
Table 2
Register
Digital Test Modes Register
Address
19h
Bit 7
Factory
Only
0*
Bit 6
Factory
Only
0*
Bit 5
Diagnostics
Request
0*
Bit 4
Slow Ramp
Bypass = 1
0*
Bit 3
Fast PWM
adjust =1
Normal = 0*
Bit 2
Factory
Only
0*
Bit 1
Post ADC Filter
Enable =1
Filter Off=0*
Bit 0
Factory
Only
0*
Note: *) Value by default
? 2009 IXYS Corp.
Characteristics subject to change without notice
7
Doc. No. 8141/61_DS, Rev. N1.0
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