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LDS8160 Datasheet(PDF) 18 Page - IXYS Corporation

Part No. LDS8160
Description  Dual-Output RGB / 6-Channel WLED Driver
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Maker  IXYS [IXYS Corporation]
Homepage  http://www.ixys.com
Logo IXYS - IXYS Corporation

LDS8160 Datasheet(HTML) 18 Page - IXYS Corporation

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LDS8160
© 2009 IXYS Corp.
18
Doc. No. 8160_DS, Rev. N1.0
Characteristics subject to change without notice
Table 11: Recommended Register Load Sequence for LDS8160
Registers’ Load
Sequence #
Register
(hex)
Value (hex)
Comments
1
1Eh
8Ah
Initialize Configuration Register
2
00h
A0h
Bank A ILED DC current @ 20 mA
3
01h
A0h
Bank B ILED DC current @ 20 mA
4
02h
A0h
Bank C ILED DC current @ 20 mA
5
03h
3Fh
Assume dual RGB use – enable all drivers
6
04h
00h
Global PWM Dimming 00h is full ON = 100% DC
7
05h
E7h
Duty Cycle code for Blue channel PWM. Use set E7h=64% DC.
User uses to establish desired White Balance
8
06h
FBh
Same as reg 05h, but for Green PWM. FBh=95% DC.
9
07h
FAh
Same as reg 05h, but for Red PWM. FAh=90% DC
10
49h
00h
Ta-Tj 0ffset
11
4Ah
1Ch
Set LED Shutdown temperature 1Ch = 105C = Tj
12
4Bh
1Fh
Set optional 2x PWM adjust step start point; 1x scale below this point
13
A0h
36h
Load Si Diode K factor for
- 1.71mV/C
14
A2h
User Loads Per LED Used
User loads LED K factor @ 1mA IF
for BLED
15
A4h
User Loads Per LED Used
User loads LED K factor @ 1mA IF. for GLED
16
A6h
User Loads Per LED Used
User loads LED K factor @ 1mA IF
for RLED.
17
C0h
40h
Load Si Diode
factor = 1.0
18
D4h
04h
Load Si Diode Rs = 68 ohms
19
D6h
User Loads Per LED Used
User loads LED Rs for BLED
20
D8h
User Loads Per LED Used
User loads LED Rs for GLED
21
DAh
User Loads Per LED Used
User loads LED Rs for RLED
22-47
50h – 5Fh
User Loads Per LED Used
LUT-B correction Table
48-64
60h – 7Fh
User Loads Per LED Used
LUT-G correction Table
65-80
70h – 7Fh
User Loads Per LED Used
LUT-R correction Table
81
1Fh
10h
User issues temp calibration command
Test results for open or short to VIN LED pins are
stored in the LED Faults Diagnostics Register 1Dh,
Bits from bit 5 to bit 0 represent LEDC2 - LEDA1
respectively with bit = 1 indicates a fault condition at
this particular LED pin. If the corresponding bit in
register 1Ch is also High = 1, than the LED is
shorted to GND as prior discussed. However when
the bit in 1Dh is High = 1 and the corresponding bit
in 1Ch is Low = 0, than the fault is either a short to
Vin or open.
An open LED pin fault causes no harm in the
LDS8160 or LED as the high side driver has no
current path from VIN or GND. Therefore, the fault
detection status indicates only in the 1Dh diagnostic
register, and no further action is required.
In the case of and LED directly shorted to VIN, the
full VIN voltage will be connected to the LED and
current can flow independent of the LDS8160 LED
driver circuit directly to GND. The LDS8160 will
detect the fault and indicate the status in Register
1Dh, however further action needs taken at the
system level to shutdown VIN power to prevent
possible damage to the LED. The combined series
resistance of the LED (typically ~ 10
Ωor more) and
additional board series resistance will result in
current limiting but not sufficient to prevent damage
to low power LEDs.
Besides the power-up diagnostic sequence, the user
can re-initiate a diagnostic command at any time by
setting bit 5 of the Digital Test Modes Register, 19h, to
HIGH.
The LDS8160 restores LED current to programmed
value at channels with detected shorts to GND after
the fault condition is removed.
Over-Temperature Protection
If the die temperature exceeds +150°C the driver will
enter shutdown mode. The LDS8160 requires restart
after die temperature falls below 130°C.
LED Selection
If the power source is a Li-ion battery, LEDs with VF =
1.9 V - 3.3 V are recommended to achieve highest
efficiency performance and extended operation on a
single battery charge.
External Components
The driver requires one external 1 µF ceramic capa-
citors (CIN) X5R or X7R type.
CUSTOM OPERATION MODES
The LDS8160 allows the option to choose custom
operating modes overwriting content of Configuration
Register 1Eh (see Table 2).


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