202314A.pdf

EVALUATION BOARD DATA SHEET
EV162
Evaluation Board for the AAT2866
Backlight/Flash LED Driver and Triple LDO Lighting Management Unit
Introduction
The AAT2866 evaluation board demonstrates the functionality of this highly integrated lighting management unit and
its application. The device provides excellent efficiency for both flash and movie modes. All backlight LED channels are
provided with excellent current matching.
Through the AS2Cwire interface, the AAT2866 can be programmed with 31mA to 0.5mA per channel backlight current
and the three LDO’s output voltages are programmable from 1.2V to 3.3V.
This document describes the evaluation board and its accompanying user interface. In addition, a brief “Getting Started”
section is included to help the user begin operating the evaluation board. A schematic of the complete circuit is shown
in Figures 1 and 2. The actual board layout is also provided in Figures 3 and 4. For additional information, please consult the AAT2866 product datasheet.
DC+
3
2
1
VIN
C10
100µF optional
lab supply bypass
J1
J4
0
VOUT
C3
2.2µF
C5
4.7µF
J3
0
C2
1.0µF
C1
1.0µF
20
21
C2-
PGND
FL2
2
C2+
3
EN/SET
BL6
4
FL_EN
BL5
5
PWMM
BL4
6
EN_LDOA/B/C
BL3
FL1
BL2
BL1
LDOA
LDOB
IN
AGND
LDOC
7
D8
19
D7
18
17
D6
16
D5
15
D4
14
D3
13
D2
D1
12
11
9
10
8
OUTC
C1-
EN_LDO_A/B/C
22
PWMM
C1+
FL_EN
IN
ENS
OUT
23
24
1
U1
AAT2866
VOUT
VINI
C8
2.2µF
Programmed
for 1.8V output
by default
OUTA
C4
4.7µF
OUTB
C7
2.2µF
Programmed
for 1.8V output
by default
C6
2.2µF
Programmed
for 1.8V output
by default
Figure 1: AAT2866 Evaluation Board Schematic.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202314A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • August 29, 2012
1
EVALUATION BOARD DATA SHEET
EV162
Evaluation Board for the AAT2866
Backlight/Flash LED Driver and Triple LDO Lighting Management Unit
VIN
J2 EN_LDOA/B/C
EN_LDOA/B/C
R5
10K
VIN
R1
1K
SW1
SW2
R2 R3
1K 1K
VIN
R4
1K
1
2
3
4
U2
VDD
GP5
GP4
GP3
VSS
GP0
GP1
GP2
8
7
6
5
C9
1µF
PIC12F675
R6
330
LED9
RED
SW3
SW4
ENS
FL_EN
DC-
Figure 2: AAT2866 Evaluation Board Microcontroller Schematic.
Getting Started
Connect the external power (3.6V-4.2V, typical battery operational range) to the DC+ and DC- terminals. A jumper
labeled J1 is inline with the terminal VIN to turn power ON/OFF. The red LED9 should illuminate, indicating that power
has been connected. EN/SET stream is provided by the PIC controller. J2 is connected to the EN_LDO A/B/C line. There
is an additional clip-on point for enabling the PWM function through PWMM input. PWMM needs to be connected to high
potential when the PWM function is not in use.
The user interface is provided by four buttons: SW1, SW2, SW3 and SW4. The modes of operation are detailed in
Table 1:
•
•
•
•
2
SW1
SW2
SW3
SW4
button controls the four LDOs
button controls the backlight
button controls the two flash channels
controls flash enable. Press and release lights the flash with 2 second default timer.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202314A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • August 29, 2012
EVALUATION BOARD DATA SHEET
EV162
Evaluation Board for the AAT2866
Backlight/Flash LED Driver and Triple LDO Lighting Management Unit
Figure 3: AAT2866 Evaluation Board Top Layer.
Figure 4: AAT2866 Evaluation Board Bottom Layer.
AAT2866 Evaluation Board User Interface Functionality
Button(s) Pushed
SW1 (LDOs)
SW2 (Backlight)
SW3 (Flash)
SW4 (Flash Enable)
Description
[Push/Release once] All LDOs will be turned on with default output voltage 1.2V. Every push release
will increment output voltage according to datasheet table.
[Push/Release once] Turning on all backlight LEDs with default current 31mA per channel. Every push
release will decrement the current according to datasheet table.
[Push/Release once] Turning on the flash LEDs with default current 300mA per channel. Every push
release will decrement the current according to datasheet table.
[Push/Release once] Turning on the flash LEDs with default timer 2 seconds for flash data 1 through
12. Flash data 13, 14 and 15 will automatically disable the timer function.
Table 1: User Interface Functionality between AAT2866 and the PIC Microcontroller.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202314A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • August 29, 2012
3
EVALUATION BOARD DATA SHEET
EV162
Evaluation Board for the AAT2866
Backlight/Flash LED Driver and Triple LDO Lighting Management Unit
AAT2866 Evaluation Board Component Listing
Component
Part Number
Description
Manufacturer
U1
U2
SW1–SW4
R1, R2, R3, R4
R5
R6
C3, C6, C7, C8
C1, C2, C9
C4, C5
D1-D6
D7, D8
LED9
J1, J2
J3
J4
AAT2866IMK
PIC12F675
PTS645TL50
Chip Resistor
Chip Resistor
Chip Resistor
GRM188R71A225KE15
GRM216R61A105KA01
GRM18x
LW M673
LXCL PWF3
CMD15-21SRC/TR8
PRPN401PAEN
Chip Resistor
Chip Resistor
Backlight LED driver with 3 LDOs
8-bit CMOS, FLASH-based μC; 8-pin PDIP package
Switch Tact, SPST, 5mm
1kΩ, 5%, 1/4W; 0603
10kΩ, 5%, 1/4W; 0603
330Ω, 5%, 1/4W; 0603
2.2µF, 10V, X7R, 0603
1µF, 10V, X5R, 0603
4.7uF, 10V,X5R, 0603
Mini TOPLED White LED; SMT
Mini TOPLED Flash LED; SMT
Red LED; 1206
Conn. Header, 2mm zip
0Ω, 5%, 1/4W; 0603
0Ω, 5%, 1/2W; 0805
Skyworks
Microchip
ITT Industries
Vishay
Vishay
Vishay
MuRata
MuRata
MuRata
OSRAM
Lumileds, Philips
Chicago Miniature Lamp
Sullins Electronics
Vishay
Vishay
Table 2: AAT2866 Evaluation Board Component Listing.
Copyright © 2012 Skyworks Solutions, Inc. All Rights Reserved.
Information in this document is provided in connection with Skyworks Solutions, Inc. (“Skyworks”) products or services. These materials, including the information contained herein, are provided by Skyworks as a
service to its customers and may be used for informational purposes only by the customer. Skyworks assumes no responsibility for errors or omissions in these materials or the information contained herein. Skyworks may change its documentation, products, services, specifications or product descriptions at any time, without notice. Skyworks makes no commitment to update the materials or information and shall have no
responsibility whatsoever for conflicts, incompatibilities, or other difficulties arising from any future changes.
No license, whether express, implied, by estoppel or otherwise, is granted to any intellectual property rights by this document. Skyworks assumes no liability for any materials, products or information provided hereunder, including the sale, distribution, reproduction or use of Skyworks products, information or materials, except as may be provided in Skyworks Terms and Conditions of Sale.
THE MATERIALS, PRODUCTS AND INFORMATION ARE PROVIDED “AS IS” WITHOUT WARRANTY OF ANY KIND, WHETHER EXPRESS, IMPLIED, STATUTORY, OR OTHERWISE, INCLUDING FITNESS FOR A PARTICULAR
PURPOSE OR USE, MERCHANTABILITY, PERFORMANCE, QUALITY OR NON-INFRINGEMENT OF ANY INTELLECTUAL PROPERTY RIGHT; ALL SUCH WARRANTIES ARE HEREBY EXPRESSLY DISCLAIMED. SKYWORKS DOES
NOT WARRANT THE ACCURACY OR COMPLETENESS OF THE INFORMATION, TEXT, GRAPHICS OR OTHER ITEMS CONTAINED WITHIN THESE MATERIALS. SKYWORKS SHALL NOT BE LIABLE FOR ANY DAMAGES, INCLUDING BUT NOT LIMITED TO ANY SPECIAL, INDIRECT, INCIDENTAL, STATUTORY, OR CONSEQUENTIAL DAMAGES, INCLUDING WITHOUT LIMITATION, LOST REVENUES OR LOST PROFITS THAT MAY RESULT FROM
THE USE OF THE MATERIALS OR INFORMATION, WHETHER OR NOT THE RECIPIENT OF MATERIALS HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
Skyworks products are not intended for use in medical, lifesaving or life-sustaining applications, or other equipment in which the failure of the Skyworks products could lead to personal injury, death, physical or environmental damage. Skyworks customers using or selling Skyworks products for use in such applications do so at their own risk and agree to fully indemnify Skyworks for any damages resulting from such improper
use or sale.
Customers are responsible for their products and applications using Skyworks products, which may deviate from published specifications as a result of design defects, errors, or operation of products outside of published parameters or design specifications. Customers should include design and operating safeguards to minimize these and other risks. Skyworks assumes no liability for applications assistance, customer product
design, or damage to any equipment resulting from the use of Skyworks products outside of stated published specifications or parameters.
Skyworks, the Skyworks symbol, and “Breakthrough Simplicity” are trademarks or registered trademarks of Skyworks Solutions, Inc., in the United States and other countries. Third-party brands and names are for
identification purposes only, and are the property of their respective owners. Additional information, including relevant terms and conditions, posted at www.skyworksinc.com, are incorporated by reference.
4
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202314A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • August 29, 2012