Analog Devices ADP5520 Manual
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Analog Devices ADP5520 Manual

Analog Devices ADP5520 Manual

Backlight driver with i/o expander evaluation board
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FEATURES

Enables evaluation of ADP5520 main functions
Backlight control
Ambient light sensing
Auxiliary LED control
Keypad decoding
GPIOs

GENERAL DESCRIPTION

The ADP5520 evaluation board allows the user to exercise the
main features and functionality of the ADP5520 backlight
driver with I/O expander IC. A daughterboard houses the
actual IC and associated components for backlight driving. The
daughter-board plugs into a larger motherboard that houses
additional components for device configuration and stimulus.
The evaluation board is powered via the USB port and is
accompanied by a free register graphical user interface (GUI)
that allows interaction with all internal settings of the
ADP5520.
Before using the evaluation board, see the ADP5520 data sheet
for information about all features available on the device and
about the use of register settings in various modes. Information
about how to use the evaluation board and GUI software to test
some key features of the ADP5520 is given in this data sheet.
Rev. 0
Evaluation boards are only intended for device evaluation and not for production purposes.
Evaluation boards are supplied "as is" and without warranties of any kind, express, implied, or
statutory including, but not limited to, any implied warranty of merchantability or fitness for a
particular purpose. No license is granted by implication or otherwise under any patents or other
intellectual property by application or use of evaluation boards. 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. Analog Devices reserves the right to change devices or specifications at any time
without notice. Trademarks and registered trademarks are the property of their respective owners.
Evaluation boards are not authorized to be used in life support devices or systems.
ADP5520 Backlight Driver with I/O
Expander Evaluation Board

FUNCTIONAL BLOCK DIAGRAM

J10
LK10
LK9
LK8
EXT
EXT
EXT
USB
USB
USB
D21
D20
D19
VBAT
VDDIO
VBOARD
OKAY
OKAY
OKAY
J1
J2
J3
R0
R1
R2
HIGH
HIGH
LOW
LOW
SW1
SW2
SW3
D1
D4
D5
D7
D3
MOTHERBOARD
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Fax: 781.461.3113
EVAL-ADP5520
INT
D18
D2
LED 1
DAUGHTERBOARD
D11
J4
J5
J6
J7
R3
C0
C1
D9
LED 3
HIGH
HIGH
HIGH
HIGH
LOW
LOW
LOW
LOW
SW4
SW5
SW6
SW7
A
B
C
S1
S2
S3
E
F
G
S5
S6
S7
D2
D6
D8
I
J
K
S9
S10
S11
M
N
O
S13
S14
S15
Figure 1.
www.analog.com
©2008 Analog Devices, Inc. All rights reserved.
D12
D13
D14
D17
D16
D15
S17
RST
J8
C2
C3
D10
LED 2
HIGH
HIGH
LOW
LOW
SW8
D
S4
H
S8
L
S12
P
S16

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Summary of Contents for Analog Devices ADP5520

  • Page 1: Features

    Devices for its use, nor for any infringements of patents or other rights of third parties that may result One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. from its use. Analog Devices reserves the right to change devices or specifications at any time Tel: 781.329.4700 www.analog.com...

  • Page 2: Table Of Contents

    EVAL-ADP5520 TABLE OF CONTENTS     Features ....................1 Auxiliary LED Blinking ............. 10     General Description ................. 1 GPIO Config Tab ................11     Functional Block Diagram .............. 1 GPIO Outputs ................11     Revision History ................2 GPIO Inputs ................

  • Page 3: Evaluation Board Overview

    J10. The jumper settings should be moved to EXT if an external power supply is used. See the ADP5520 data sheet for the supply ranges of VBAT and VDDIO. VBOARD should be supplied with 3.3 V.

  • Page 4: Getting Started

    THE SUPPLIED USB CABLE The register interface GUI is divided into tabs that focus on particular features of the ADP5520 (see Figure 4). Click the tabs ALLOW WINDOWS TO FIND THE USB DRIVER to move among them.

  • Page 5: Backlight Config Tab

    EVAL-ADP5520 BACKLIGHT CONFIG TAB Figure 4. BackLight Config Tab BACKLIGHT TURN-ON In the Daylight Dim Current drop-down box, select a backlight dim current setting (for example, 5 mA); then You must first put the device in a known state by pressing the program this setting by clicking the Program 0x06 button.

  • Page 6: Backlight Turn-On With Automatic Turn-Off

    EVAL-ADP5520 then program this setting by clicking the Program 0x05 In the Daylight Dim Current drop-down box, select a backlight dim current setting (for example, 5 mA); then button. In the Daylight Dim Current drop-down box, select a program this setting by clicking the Program 0x06 button.

  • Page 7: Backlight Zone Adjustment (Manual)

    Register 0x00 and program this setting by clicking the AMBIENT LIGHT SENSING) Program 0x00 button. The ADP5520 contains an ambient light sensor that measures the output current of an external photosensor. The ADP5520 The backlight begins to turn off and fade out to zero can switch between backlight operating zones based on ambient current.
  • Page 8 EVAL-ADP5520 10. Set Bit 6 and Bit 7 in Register 0x00 high; then program switches to the dark operating zone and is driven by the current chosen in Step 3. these settings by clicking the Program 0x00 button. 11. To adjust the ambient light sensor response time, change...

  • Page 9: Aux Leds Config Tab

    EVAL-ADP5520 AUX LEDS CONFIG TAB Figure 5. Aux LEDs Config Tab All three auxiliary LEDs turn on. AUXILIARY LED TURN-ON/TURN-OFF To turn off an LED, clear Bit 0, Bit 1, and/or Bit 2 in First press the reset button (S17) on the evaluation board to put Register 0x11 on the Aux LEDs Config tab.

  • Page 10: Auxiliary Led Blinking

    EVAL-ADP5520 In the LED 3 Current drop-down box, select the LED 3 On the BackLight Config tab, set Bit 7 in Register 0x00 high; then program this setting by clicking the Program sink current setting (for example, 14 mA); then pro- gram this setting by clicking the Program 0x16 button.

  • Page 11: Gpio Config Tab

    EVAL-ADP5520 GPIO CONFIG TAB Figure 6. GPIO Config Tab GPIO OUTPUTS GPIO INPUTS First press the reset button (S17) on the evaluation board to put First press the reset button (S17) on the evaluation board to put the device in a known state; then complete the following steps.

  • Page 12: Gpio Inputs With Interrupt

    EVAL-ADP5520 GPIO INPUTS WITH INTERRUPT The readback value should indicate that the LSB is set to 1 and, therefore, that GPI D0 (R0 pin) is currently high. First press the reset button (S17) on the evaluation board to put Read back Register 0x1C by clicking the Read 0x1C the device in a known state;...

  • Page 13: Keypad Status Tab

    EVAL-ADP5520 KEYPAD STATUS TAB Figure 7. Keypad Status Tab KEYPAD MATRIX DECODING This configures Pin C0 through Pin C3 as keypad matrix columns. First press the reset button (S17) on the evaluation board to put On the motherboard, press and release the S1 switch the device in a known state;...

  • Page 14: Keypad Matrix Decoding With Interrupt

    EVAL-ADP5520 KEYPAD MATRIX DECODING WITH INTERRUPT On the BackLight Config tab, read Register 0x00 by clicking the Read 0x00 button. First press the reset button (S17) on the evaluation board to put the device in a known state; then complete the following steps.
  • Page 15 EVAL-ADP5520 On the BackLight Config tab, do the following: This takes the ADP5520 out of standby mode. Set Bit 0 of Register 0x02 high; then program this On the motherboard, press and release the S1 switch setting by clicking the Program 0x02 button.

  • Page 16: Command Save/Load Tab

    The Command Save/Load tab can be used to record data that Command History box. You can save the command history list you write to or read from the ADP5520. By default, this feature to a file by clicking the Save Command History to File button.

  • Page 17: Evaluation Board Schematics

    EVAL-ADP5520 EVALUATION BOARD SCHEMATICS DAUGHTERBOARD SCHEMATIC VBAT 4.7u H 1UF/50V 1UF/16V BL_SNK 1UF/16V VBAT VBAT VBAT VBAT 0.1UF PGND CMP_IN VBoard CMP_IN VDDIO VDDIO ADP5520 APDS-9005 ILED ILED VBoard BL_SNK VDDIO ILED Figure 9. Rev. 0 | Page 17 of 24...

  • Page 18: Motherboard Schematic

    EVAL-ADP5520 MOTHERBOARD SCHEMATIC (PAGE 1) EXT_VBOARD VBOARD EXT_VDDIO VDDIO EXT_VBAT LK10 VBAT VBAT VBAT VBAT VBAT 2.2 uF ADJ/SS/TRK GND 2.2 uF ADP1715 /16 46.4k VBOARD BL_SNK VDDIO ILED 2.2 uF ADJ/SS/TRK GND 2.2 uF ADP1715 /16 24.3K 2.2 uF ADJ/SS/TRK GND 2.2 uF...

  • Page 19: Motherboard Schematic

    EVAL-ADP5520 MOTHERBOARD SCHEMATIC (PAGE 2) BL_SNK Row0_GPO VDDIO Row0_GPI Row0_KP U3 ADG802 VBOARD Row1_GPO Row1_GPI Row1_KP VBOARD Row2_GPO 10uF 0.1uF Row2_GPI Row2_KP VBOARD Row3_GPO Row3_GPI Row3_KP VBOARD Col0_GPO Col0_GPI Col0_KP ILED Col1_GPO Col1_GPI Col1_KP VDDIO Col2_GPO Col2_GPI Col2_KP Col3_GPO Col3_GPI...

  • Page 20: Motherboard Schematic

    EVAL-ADP5520 MOTHERBOARD SCHEMATIC (PAGE 3) VDDIO Row0_GPI Row0_KP VDDIO Row1_GPI Row1_KP VDDIO Row2_GPI VDDIO Row3_GPI Row2_KP VDDIO Col0_GPI VDDIO Row3_KP Col1_GPI VDDIO Col2_GPI VDDIO Col0_KP Col1_KP Col2_KP Col3_KP Col3_GPI VBOARD VBOARD Col0_GPO Row0_GPO R35100k R31100k VBOARD VBOARD Col1_GPO Row1_GPO R36100k...

  • Page 21: Motherboard Schematic

    EVAL-ADP5520 MOTHERBOARD SCHEMATIC (PAGE 4) 0.1uF 0.1uF 10uF 100k VBOARD VBOARD 0.1uF 100k VBOARD RDY0/SLRD RESET RDY1/SLWR GND4 100nF 2.2uF VBOARD 6.2pF AVCC1 PA7/FLAG XTALOUT PA6/PKTEND XTALIN PA5/FIFOADR1 AGND1 PA4/FIFOADR0 100k 100nF 2.2uF VBOARD VBOARD 6.2pF AVCC2 PA3/WU2 CY7C68013 A...

  • Page 22: Ordering Information

    EVAL-ADP5520 ORDERING INFORMATION BILL OF MATERIALS (DAUGHTERBOARD) Table 2. Reference Designator Description Manufacturer/Vendor Part Number C1, C3 Capacitor MLCC, 1 μF, 16 V, 0603, X5R Murata GRM188R61C105K Capacitor MLCC, 1 μF, 50 V, 0805, X7R Murata GRM21BR71H105K Capacitor MLCC, 0.1 μF, 25 V, 0603, X7R...

  • Page 23: Ordering Guide

    EVAL-ADP5520 Reference Designator Description Manufacturer/Vendor Part Number Resistor, 46.4 kΩ, 0402 Vishay or equivalent CRCW040246K4FKE Resistor, 24.3 kΩ, 0402 Vishay or equivalent CRCW040224K3FKE Resistor, 31.6 kΩ, 0402 Vishay or equivalent CRCW040231K6FKE R28, R29 Resistor, 2.2 kΩ, 0805 Vishay or equivalent CRCW08052K21FKE Resistor, 681 Ω...
  • Page 24 EVAL-ADP5520 NOTES ©2008 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. EB07651-0-10/08(0) Rev. 0 | Page 24 of 24...

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