202285A.pdf

EVALUATION BOARD DATA SHEET
EV161
Evaluation Board for the AAT2862
Backlight LED Driver and Multiple LDO Lighting Management Unit
Introduction
The AAT2862 evaluation board demonstrates the functionality of the AAT2862 and its application as a highly integrated
lighting management unit. The device provides excellent efficiency for both flash and movie modes. All backlight LED
channels are provided with excellent current matching.
Through the I2C interface, the AAT2862 can be programmed with 30mA to 0.48mA per channel backlight current and
the four LDOs' 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 AAT2862 product datasheet.
DC+
1
2
3
VIN
C5
4.7µF
C11
100µF (optional)
100µF lab supply bypass
J1
VOUT
C3
2.2µF
C2
1.0µF
C1
1.0µF
5
EN
6
BL5
D6
BL7/AUX1
17
D7
BL8/AUX2
16
D8
AGND
BL1
LDOD
LDOA
LDOB
IN
15
D4
BL3
14
D3
BL2
13
D2
12
11
9
10
8
D1
C4
4.7µF LDOC
C9
2.2µF
C8
2.2µF
LDOB
C7
2.2µF
D5
19
18
BL6
BL4
LDOC
7
20
EN
PGND
SCL
C2-
4
21
SDA
SCL
C1-
SDA
22
C2+
3
IN
2
C1+
OUT
23
24
1
U1
AAT2862
C6
2.2µF
VOUT
LDOD
LDOA
Figure 1: AAT2862 Schematic.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202285A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • August 22, 2012
1
EVALUATION BOARD DATA SHEET
EV161
Evaluation Board for the AAT2862
Backlight LED Driver and Multiple LDO Lighting Management Unit
VIN
R1
1K
R2
1K
R3
1K
VIN
1
SW1
SW2
2
3
4
U2
VDD
GP5
GP4
GP3
PIC12F675
VSS
GP0
GP1
GP2
C10
1µF
8
7
6
5
R7
330
VIN
LED9
RED
R5
10K
SW3
J2
R4
10K
SCL
SCL
SDA
VIN
DC-
J3
SDA
J4
EN
EN
R6
100K
Figure 2: AAT2862 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. The two jumpers J2 and J3 are the clock SCL and data SDA lines for the I2C interface. There is an
additional jumper J4 that connects the enable signal EN to the AAT2862.
The user interface is provided by three buttons: SW1, SW2, and SW3. The modes of operation are detailed in Table 1.
The SW1 button controls the four LDOs. The SW2 button controls the MAIN backlight. The SW3 button controls the SUB
channels. The SW1 and SW2 buttons pressed together control MAIN+SUB backlight fade-out. The SW1 and SW3 buttons pressed together control MAIN+SUB backlight fade-in. All three buttons (SW1, SW2, and SW3) pressed together
reset the registers of the AAT2862 and turn off the LEDs.
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Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202285A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • August 22, 2012
EVALUATION BOARD DATA SHEET
EV161
Evaluation Board for the AAT2862
Backlight LED Driver and Multiple LDO Lighting Management Unit
Figure 3: AAT2862 Evaluation Board
Top Layer. Figure 4: AAT2862 Evaluation Board
Bottom Layer.
AAT2862 Evaluation Board User Interface Functionality
Button(s) Pushed
SW1 (LDOs)
SW2 (MAIN)
SW3 (SUB)
SW1 + SW2
SW1 + SW3
SW1 + SW2 + SW3
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 the MAIN backlight LEDs with default current 30mA per channel. Every
push release will decrement the current according to datasheet table.
[Push/Release once] Turning on the SUB backlight LEDs with default current 30mA. Every push release
will decrement the current according to datasheet table.
[Push/Release once] Turning on all MAIN+SUB backlight LEDs with default current 30mA. The current
starts to fade-out automatically down to 0.48mA per channel.
[Push/Release once] Turning on the all MAIN+SUB backlight LEDs with default current 0.48mA. The
current will increase automatically up to 30mA per channel.
[Push/Release once] Reset all registers to default.
Table 1: AAT2862 Evaluation Board User Interface Functionality.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202285A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • August 22, 2012
3
EVALUATION BOARD DATA SHEET
EV161
Evaluation Board for the AAT2862
Backlight LED Driver and Multiple LDO Lighting Management Unit
AAT2862 Evaluation Board Component Listing
Component
Part Number
Description
Manufacturer
U1
U2
SW1 – SW3
R1, R2, R3
R4, R5
R6
R7
C3, C6, C7, C8, C9
C1, C2, C10
C4, C5
D1-D8
LED9
J1, J2, J3, J4
AAT2862IMK
PIC12F675
PTS645TL50
Chip Resistor
Chip Resistor
Chip Resistor
Chip Resistor
GRM188R71A225KE15
GRM216R61A105KA01
GRM18x
LW M673
CMD15-21SRC/TR8
PRPN401PAEN
Backlight LED driver with 4 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
100kΩ, 5%, 1/4W; 0603
330Ω, 5%, 1/4W; 0603
2.2µF, 10V, X7R, 0603
1µF, 10V, X5R, 0603
4.7µF, 10V,X5R, 0603
Mini TOPLED White LED; SMT
Red LED; 0603
Conn. Header, 2mm zip
Skyworks
Microchip
ITT Industries
Vishay
Vishay
Vishay
Vishay
MuRata
MuRata
MuRata
Lumileds, Philips
Chicago Miniature Lamp
Sullins Electronics
Table 2: AAT2862 Evaluation Board Component Listing.
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Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202285A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • August 22, 2012