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LDS9003 / 9001
?009 IXYS Corp.
8
Doc. No. 9003/9001_DS, Rev. N1.0
Characteristics subject to change without notice
ADDRESS   DESCRIPTION
BITS    NOTES
A6h
LED3 dV
F
/dT [7:0]
(connected to TSENSE3)
8
Same as above for reg A2h
Not used for 9001
C0h
Silicon diode ? [7:0]
8
Silicon diode ? (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
bits from bit 4 to bit 0 - fractional part (resolution = 0.015625
per LSB)
Example: ? = 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
D4h
Silicon diode R
s
offset
[7:0]
8
Silicon diode series resistance offset
Factory recommended loaded value = 04h = ~ 68 ohms
Formula (decimal) = 8192 x [(68 ohms x 8 x 10
-6
A)/1.14 V]
D6h
LED1 Rs offset [7:0]
8
LED Rs offset (user-loaded) for LED sensing channels 1, 2,
and 3 for specific LEDs used
User loads per LED used. (1/slope of high current region of
LED I-V characteristic).
Formula (decimal) = 8192 x [(Rs ﹛ 8 x 10
-4
A) / 1.14V]
D8h
LED2 Rs offset [7:0]
(not used for 9001)
8
Same as above for reg D6h. Not use for 9001
DAh
LED2 Rs offset [7:0]
(not used for 9001)
8
Same as above for reg D6h. Not used for 9001
Table 1
Channel Enable Register
Register
Address
Bit 7    Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
03h
(9003)
LED
OT
Flag
N/A
1
0
1
0
1
0
(9001)
Same    N/A
0
0
0
0
1
0
Note: User must load shown values upon boot or after reset; all POR bit values are 0
Table 2
Digital Test Modes Register
Register
Address
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Factory
Only
Factory
Only
Diagnostics
Request
Slow Ramp
Bypass = 1
Fast PWM
adjust =1
Factory
Only
Post ADC
Filter Enable
=1
Factory
Only
19h
0*
0*
0*
0*
Normal = 0*
0*
Filter Off=0*
0*
Note: *) Value by default
Table 3
Configuration Register
Register
Address
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
1Eh(9003)
1
0
0
0
1
0
0
0
1Eh (9001)
0
0
0
0
0
0
0
0
Note: User must load shown values upon boot or after reset; all POR bit values are 0
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