Datasheet > ADP5520

ADP5520

更新时间： 2024-11-06 04:04:39

品牌	Logo	应用领域
亚德诺 - ADI		驱动器
页数	文件大小	规格书
40页	1370K
描述
Backlight Driver with I/O Expander

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中文翻译

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ADP5520 数据手册

Backlight Driver with I/O Expander

ADP5520

TYPICAL OPERATING CIRCUIT

FEATURES

1µF

VBAT

Efficient asynchronous boost converter for driving up to

6 white LEDs

2.7 V to 5.5 V input voltage range

4.7µH

1µF

128 programmable backlight LED current levels (30 mA

maximum)

Ambient light sensing with autonomous backlight

adjustment

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)

BST

BL_SNK

PGND

VBAT

CAP_OUT

I/O RAIL

1µF

VDDIO

GND

ADP5520

SCL

SDA

nINT

nRST

100nF

VBAT

CMP_IN

R3 R2 R1 R0 C0 C1 C2 C3

ILED

10 11 12

Programmable auxiliary LED fade-in/fade-out times

Programmable auxiliary LED on and off times (allows

blinking)

VBAT

Figure 1.

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

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.

Trademarks and registeredtrademarks arethe property of their respective owners.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 781.329.4700

Fax: 781.461.3113

www.analog.com

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