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ADP5501
Table 5. Comparator Output Truth Table
By default, the ADP5501 uses a linear algorithm (LED_LAW = 0
BL_AUTO_ADJ
0
L3_OUT
X 1
L2_OUT
X 1
Backlight Operation
BL_LVL can be manually
in Register 0x11), where the LED sink current increases linearly
for a corresponding increase of input code. The LED sink current,
set by the user.
in milliamperes (mA), is determined by the following equation:
1
1
0
0
0
1
BL_LVL = 00; backlight
operates at L1 (daylight).
BL_LVL = 01; backlight
LED Sink Current = Code × ( Fullscale_Current /63)
where:
(3)
operates at L2 (office).
Code is the input code programmed by the user.
1
1
0
BL_LVL = 10; backlight
Fullscale_Current is the maximum sink current allowed
X = don’t care.
operates at L3 (dark).
1 1 1 BL_LVL = 10; backlight
operates at L3 (dark).
1
The L3_OUT status bit has greater priority; therefore, the back-
light operates at L3 (dark) even if L2_OUT is set.
(typically, 14 mA).
The ADP5501 can also implement a nonlinear (square approx-
imation) relationship between input code and LED sink current
level. In this case (LED_LAW = 1 in Register 0x11), the LED
sink current, in milliamperes (mA), is determined by the
following equation:
LED Sink Current = ? Code ×
?
?
?
LED CURRENT SINKS
The ADP5501 has three additional current sinks that can be
used as RGBs or auxiliary LED current sinks. Each current sink
?
?
Fullscale _ Current
63
?
?
2
(4)
is programmable up to 14 mA (typical) and can be independ-
ently turned on and off.
The LED0 pin is the current sink for LED0. Its sink current can
be set using LED0_CURRENT in Register 0x14. LED0 sink can
be enabled with LED0_EN in Register 0x11.
The LED1 pin is the current sink for LED1. Its sink current can
Figure 33 shows the backlight current level vs. the input code
for both the linear and square law algorithms.
14
12
10
be set using LED1_CURRENT in Register 0x15. LED1 sink can
be enabled with LED1_EN in Register 0x11.
The LED2 pin is the current sink for LED2. Its sink current can
be set using LED2_CURRENT in Register 0x16. LED2 sink can
be enabled with LED2_EN in Register 0x11.
These LEDx_CURRENT registers are six bits wide, allowing the
user to set the LED sink current to one of 64 different levels
8
6
4
2
LINEAR
SQUARE
between 0 mA and 14 mA. The ADP5501 can implement two
0
0
16
32
48
64
distinct algorithms to achieve a linear and a nonlinear relation-
ship between input code and sink current.
CODE
Figure 33. LED Sink Current vs. Code
VBAT
LED0
VBAT
LED1
VBAT
LED2
LED0_EN
LED0_CURRENT
LED0_OFFT
LED 1
DIGITAL
COUNTERS
AND
CONTROL
LED1_EN
LED1_CURRENT
LED1_OFFT
LED 2
DIGITAL
COUNTERS
AND
CONTROL
LED2_EN
LED2_CURRENT
LED2_OFFT
LED 3
DIGITAL
COUNTERS
AND
CONTROL
LED_ONT
LED_FI
LED_FO
LED_LAW
Figure 34. Status LED Current Sink
Rev. 0 | Page 15 of 28
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