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LDS8160
Table 11: Recommended Register Load Sequence for LDS8160
Registers’ Load
Sequence #
1
2
3
4
5
6
7
8
9
10
11
12
13
Register
(hex)
1Eh
00h
01h
02h
03h
04h
05h
06h
07h
49h
4Ah
4Bh
A0h
Value (hex)
8Ah
A0h
A0h
A0h
3Fh
00h
E7h
FBh
FAh
00h
1Ch
1Fh
36h
Comments
Initialize Configuration Register
Bank A ILED DC current @ 20 mA
Bank B ILED DC current @ 20 mA
Bank C ILED DC current @ 20 mA
Assume dual RGB use – enable all drivers
Global PWM Dimming 00h is full ON = 100% DC
Duty Cycle code for Blue channel PWM. Use set E7h=64% DC.
User uses to establish desired White Balance
Same as reg 05h, but for Green PWM. FBh=95% DC.
Same as reg 05h, but for Red PWM. FAh=90% DC
Ta-Tj 0ffset
Set LED Shutdown temperature 1Ch = 105C = Tj
Set optional 2x PWM adjust step start point; 1x scale below this point
Load Si Diode K factor for - 1.71mV/C
14
A2h
User Loads Per LED Used
User loads LED K factor @ 1mA I F
for BLED
15
A4h
User Loads Per LED Used
User loads LED K factor @ 1mA I F. for GLED
16
17
18
19
20
21
22-47
48-64
65-80
81
A6h
C0h
D4h
D6h
D8h
DAh
50h – 5Fh
60h – 7Fh
70h – 7Fh
1Fh
User Loads Per LED Used
40h
04h
User Loads Per LED Used
User Loads Per LED Used
User Loads Per LED Used
User Loads Per LED Used
User Loads Per LED Used
User Loads Per LED Used
10h
User loads LED K factor @ 1mA I F
?
Load Si Diode ? factor = 1.0
Load Si Diode Rs = 68 ohms
User loads LED Rs for BLED
User loads LED Rs for GLED
User loads LED Rs for RLED
LUT-B correction Table
LUT-G correction Table
LUT-R correction Table
User issues temp calibration command
for RLED.
Test results for open or short to V IN 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 V IN 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 V IN , the
full V IN 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 V IN power to prevent
possible damage to the LED. The combined series
resistance of the LED (typically ~ 10 ? or 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 V F =
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 (C IN ) 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).
? 2009 IXYS Corp.
Characteristics subject to change without notice
18
Doc. No. 8160_DS, Rev. N1.0
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