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PDF ADP5520 Data sheet ( Hoja de datos )
| Número de pieza | ADP5520 | |
| Descripción | Backlight Driver | |
| Fabricantes | Analog Devices | |
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Backlight Driver with I/O Expander
ADP5520
FEATURES
Efficient asynchronous boost converter for driving up to
6 white LEDs
2.7 V to 5.5 V input voltage range
128 programmable backlight LED current levels (30 mA
maximum)
Ambient light sensing with autonomous backlight
www.DataSheet4Uad.cjoumstment
Programmable backlight fade-in/fade-out times
Programmable backlight dim and off times
8 configurable GPIO pins (input, output, up to 4 × 4 keypad)
Up to 3 auxiliary LED current sinks (1 dedicated, 2 configurable)
64 programmable auxiliary LED current levels (14 mA
maximum)
Programmable auxiliary LED fade-in/fade-out times
Programmable auxiliary LED on and off times (allows
blinking)
I2C-compatible serial interface
Interrupt line for signaling an external processor (nINT)
Hard reset (nRST)
Current limit protection
Thermal overload protection
Available in small 4.0 mm × 4.0 mm, 24-lead LFCSP package
TYPICAL OPERATING CIRCUIT
VBAT
1µF
I/O RAIL
1µF 4.7µH
2
1 PGND SW
21 VBAT
22
BST
23
BL_SNK
CAP_OUT 20
16 VDDIO
5 SCL
ADP5520
4 SDA
3 nINT
15 nRST
R3 R2 R1 R0 C0 C1 C2 C3
13 6 7 8 9 10 11 12
GND 19
GND 18
GND 24
CMP_IN 17
ILED
14
1µF
100nF
VBAT
A BC D
E FGH
Figure 1.
VBAT
APPLICATIONS
Display backlight driver for phones that require slider or flip
keypad functions with single or multiple LED indicators
GENERAL DESCRIPTION
The ADP5520 is a versatile single-chip, white LED backlight
driver with a user configurable I/O expander. This device fits
handset applications where the flip or slider section of the phone
requires backlighting, I/O signaling and detecting, auxiliary LED
lighting, and keypad functions. By incorporating an I2C®-
compatible serial interface and a single line interrupt, the
ADP5520 significantly reduces the total number of lines
required to interface with the baseband processor across the
hinge flex.
The ADP5520 can detect ambient light levels and adjust the
backlight brightness accordingly, resulting in extended battery
operation.
Once configured, the ADP5520 is capable of controlling the
flip/slider backlight intensity, on/off timing, dimming, and
fading without the intervention of the main processor, which
results in valuable battery power saving.
Rev. 0
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113
©2008 Analog Devices, Inc. All rights reserved.
1 page  
ABSOLUTE MAXIMUM RATINGS
Table 3.
Parameter
VBAT to GND
VDDIO to GND
SW, BST to GND
ILED, R0, R1, R2, R3, C0, C1, C2, C3, CMP_IN,
SCL, SDA, nINT, nRST, CAP_OUT, BL_SNK
to GND
PGND to GND
Operating Ambient Temperature Range
www.DataSheeOt4pUe.rcaotming Junction Temperature Range
Storage Temperature Range
Soldering Conditions
Rating
−0.3 V to +6 V
−0.3 V to VBAT
−0.3 V to +30 V
−0.3 V to +6 V
−0.3 V to +0.3 V
−40°C to +85°C1
−40°C to +125°C
−65°C to +150°C
JEDEC J-STD-020
1 In applications where high power dissipation and poor thermal resistance
are present, the maximum ambient temperature may have to be derated.
Maximum ambient temperature (TA(MAX)) is dependent on the maximum
operating junction temperature (TJ(MAXOP) = 125°C), the maximum power
dissipation of the device (PD(MAX)), and the junction-to-ambient thermal
resistance of the part/package in the application (θJA), using the following
equation: TA(MAX) = TJ(MAXOP) − (θJA × PD(MAX)).
Stresses above those listed under Absolute Maximum Ratings
may cause permanent damage to the device. This is a stress
rating only; functional operation of the device at these or any
other conditions above those indicated in the operational
section of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect
device reliability.
Absolute maximum ratings apply individually only, not in
combination. Unless otherwise specified, all other voltages are
referenced to GND.
ADP5520
THERMAL RESISTANCE
θJA is specified for the worst-case conditions, that is, a device
soldered in a circuit board for surface-mount packages.
Table 4. Thermal Resistance
Package Type
24-Lead LFCSP (CP-24-2)
θJA
50
Unit
°C/W
ESD CAUTION
Rev. 0 | Page 5 of 40
5 Page 
BACKLIGHT TURN ON/OFF/DIM
With the device in operating mode (nSTNBY = 1), the backlight
can be turned on using the BL_EN bit in Register 0x00. Before
turning on the backlight, the user should choose which level
(daylight (L1), office (L2), or dark (L3)) to operate in, and ensure
that maximum and dim settings are programmed for that level.
The backlight turns on when BL_EN = 1. The backlight turns
off when BL_EN = 0.
BACKLIGHT
CURRENT
MAX
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ADP5520
AUTOMATIC DIM AND TURN OFF TIMERS
The user can program the backlight to dim automatically by
using the BL_DIMT timer in Register 0x03. The dim timer has
15 settings ranging from 10 sec to 2 min. The user should
program the dim timer before turning on the backlight. If
BL_EN = 1, the backlight turns on to its maximum setting, and
the dim timer starts counting. When the dim timer expires, the
internal state machine sets DIM_EN = 1, and the backlight goes
to its dim setting.
BACKLIGHT
CURRENT
DIM TIMER
RUNNING
DIM TIMER
RUNNING
MAX
BL_EN = 1
BL_EN = 0
Figure 17. Backlight Turn On/Off
While the backlight is on (BL_EN = 1), the user can make it
change to a dim setting by programming DIM_EN = 1 in
Register 0x00. If DIM_EN = 0, the backlight reverts to its
maximum setting.
BACKLIGHT
CURRENT
MAX
DIM
BL_EN = 1 DIM_EN = 1 DIM_EN = 0 BL_EN = 0
Figure 18. Backlight Turn On/Dim/Off
The maximum and dim settings can be set between 0 mA and
30 mA; therefore, it is possible to program a dim setting that is
greater than a maximum setting. For normal expected operation,
users should ensure that the dim setting is programmed to be less
than the maximum setting.
It is also possible to activate the backlight automatically when a
key press is detected. With the row and column pins configured as
a keypad matrix, and the KP_BL_EN bit asserted in Register 0x02,
the internal state machine asserts BL_EN and turns on the back-
light if a key is pressed. See the I/O Expansion Pins (Keypad
Matrix) section for more information on using keypad
functionality.
DIM
BL_EN = 1 DIM_EN = 1 DIM_EN = 0 DIM_EN = 1
OR
SET BY USER
BL_EN = 1
SET BY INTERNAL STATEMACHINE
BL_EN = 0
Figure 19. Dim Timer
If the user clears the DIM_EN bit (or reasserts the BL_EN bit),
the backlight reverts to its maximum setting and the dim timer
begins counting again. When the dim timer expires, the internal
state machine again sets DIM_EN = 1, and the backlight goes to
its dim setting. Reasserting BL_EN at any point during the dim
timer countdown causes the timer to reset and begin counting
again. The backlight can be turned off at any point during the
dim timer countdown by clearing BL_EN.
The user can also program the backlight to turn off automati-
cally by using the BL_OFFT timer in Register 0x03. The off
timer has 15 settings ranging from 10 sec to 2 min. The user
should program the off timer before turning on the backlight.
If BL_EN = 1, the backlight turns on to its maximum setting,
and the off timer starts counting. When the off timer expires,
the internal state machine clears the BL_EN bit, and the
backlight turns off.
BACKLIGHT
CURRENT
OFF TIMER
RUNNING
MAX
Rev. 0 | Page 11 of 40
BL_EN = 1 BL_EN = 0
SET BY USER
SET BY INTERNAL STATE MACHINE
Figure 20. Off Timer
11 Page | ||
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| PDF Descargar | [ Datasheet ADP5520.PDF ] | |
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