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LDS8161/41
Table 3
Register
Configuration Register
Address
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Factory Set
Factory Factory Factory Factory
dT adjust
Soft Start
Factory
1Eh
1*
Factory trimmed;
User should write 0
Only
0*
Only
0*
Only
0*
Only
0*
disabled = 1*
dT adjust
enabled = 0
disabled = 1
Soft Start
enabled = 0*
Only
0*
Note: *) Value by default
Table 4
Register
Control Register
Address
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
1Fh
Software
reset = 1
Standby Temperature
mode = 1 request = 1
Normal operation = 0*
Calibration
request = 1
Custom OSC
trim = 1
Factory
preset = 0*
Osc
trim 2
**
Osc
trim 1
**
Osc
trim 0
**
Note:
*) Value by default
**) Trim code defined by customer
Bit 7 = 1 — Software reset: resets device, all registers reset/cleared.
Bit 6 = 1 — Standby (oscillator disabled, all registers retain programmed values.)
Table 5: Ta-Tj Temperature Gradient Offset
( Set offset code to match reference De-rate point in LUT from LED Tj to Ta. Typically LED and Si are equal)
Register
Control Register
Address
49h
Bit 7
LED
Offset 3
0*
Bit 6
LED
Offset 2
0*
Bit 5
LED
Offset 1
0*
Bit 4
LED
Offset 0
0*
Bit 3
Si Diode
Offset 3
0*
Bit 2
Si Diode
Offset 2
0*
Bit 1
Si Diode
Offset 1
0*
Bit 0
Si Diode
Offset 0
0*
Note:
*) Value by default
Table 6: Offset Codes for Tj-Ta Temperature Gradient Offset (both LED and Si per Table 5).
Offset C
Offset C
Offset C
Offset C
Temperature
0
(Ta-Tj)
-40
-35
-30
-25
Bit3– Bit
0
1000
1001
1010
1011
Temperature
0
(Ta-Tj)
-20
-15
-10
-5
Bit3– Bit
0
1100
1101
1110
1111
Temperature
0
(Ta-Tj)
0
5
10
15
Bit3–
Bit 0
0000
0001
0010
0011
Temperature
0
(Ta-Tj)
20
25
30
35
Bit3–
Bit 0
0100
0101
0110
0111
Table 7: T-code values vs. Temperature (for registers 4Ah & 4Bh)
Temperature
Bit4 –
Temperature
Bit4 –
Temperature
Bit4 –
Temperature
Bit4 –
C
0
Bit 0
0
C
Bit 0
0
C
Bit 0
0
C
Bit 0
25
30
35
40
45
01100
01101
01110
01111
10000
50
55
60
65
70
10001
10010
10011
10100
10101
75
80
85
90
95
10110
10111
11000
11001
11010
100
105
110
115
120
11011
11100
11101
11110
11111
? 2009 IXYS Corp.
Characteristics subject to change without notice
8
Doc. No. 8141/61_DS, Rev. N1.0
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