LP5522TMEV National Semiconductor, LP5522TMEV Datasheet

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LP5522TMEV

Manufacturer Part Number
LP5522TMEV
Description
BOARD EVAL LP5522 LED DRIVER
Manufacturer
National Semiconductor
Series
PowerWise®r
Datasheets

Specifications of LP5522TMEV

Current - Output / Channel
20mA
Outputs And Type
1, Non-Isolated
Features
USB Interface
Voltage - Input
2.7 ~ 5.5V
Utilized Ic / Part
LP5522
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Voltage - Output
-
© 2007 National Semiconductor Corporation
LP5522 Evaluation Kit
General Description
The LP5522 is a simple single wire programmable LED con-
troller in six bump micro SMD package. It provides constant
current flow through high side driver. Output current can be
set from 1 mA to 20 mA by using an external resistor on the
ISET pin. If no external resistor is used, output current is set
to 5 mA default current. The LP5522 is controlled using only
one signal. The signal controls either directly the LED driver
or it launches previously programmed blinking sequence.
The LP5522 works autonomously without a clock signal from
the master device. Very low LED driver headroom voltage
makes possible to use supply voltages close to LED forward
voltage. Current consumption of the LP5522 is minimized
when LED is turned off and once controller is disabled all
supporting functions are also shut down. Very small micro
SMD package together with minimum number of external
components is a best fit for handheld devices.
Figure 1. LP5522 Evaluation board with USB interface board
300217
National Semiconductor
AN-1636
Anssi Raisanen
June 2007
Evaluation Kit Overview
LP5522 Evaluation Kit is based on a modular system, where
the actual evaluation board is plugged on top of the PC inter-
face board. The interface operates through the USB port.
The kit supports complete functional evaluation of the circuit.
The evaluation kit consists of:
LP5522 evaluation board
USB interface board
USB interface cable
CD—ROM including:
— Evaluation software
— LP5522 datasheet
— Evaluation kit document (this doc.)
30021715
www.national.com

Related parts for LP5522TMEV

LP5522TMEV Summary of contents

Page 1

... Very small micro SMD package together with minimum number of external components is a best fit for handheld devices. Figure 1. LP5522 Evaluation board with USB interface board © 2007 National Semiconductor Corporation National Semiconductor AN-1636 Anssi Raisanen ...

Page 2

Evaluation Software LP5522 evaluation software (LP5522.exe) is supplied on the delivery CD together with all available documentation regard- ing the circuit. Copy the LP5522.exe an the usblptio.dll to your PC’s hard disk. The usblptio.dll needs the same ...

Page 3

Evaluation Hardware The evaluation board has the LP5522 circuit with the neces- sary external components placed around it. Test points for the circuit pins are on the board. USB interface card can supply the VDD voltage. If external power supply ...

Page 4

USB Interface The USB interface forms the connection between the PC and the evaluation system. It converts the commands from PC to one wire interface used in LP5522. It also provides the supply voltage for the evaluation board. Interface board ...

Page 5

Getting Started The following instructions show how to use the LP5522 eval- uation kit in default conditions with the USB interface board. Please use ESD protection to prevent any unwanted damag- ing ESD events 1. Check the onboard jumpers. VDD ...

Page 6

Figure 7. LP5522 Evaluation Software With Two Blinking Sequences Programmed To The Chip www.national.com 6 30021709 ...

Page 7

Board Layout The evaluation board layers are: 1. Top, component side, signal 2. Bottom, GND plane Figure 8. LP5522 Evaluation Board Layer 1 (Top, Signal). 30021710 Figure 9. LP5522 Evaluation Board Layer 2 (Bottom, GND). 7 30021711 www.national.com ...

Page 8

Figure 10. LP5522 Evaluation Board Schematic 8 30021712 ...

Page 9

List of Components Reference Model C1 100 nF 10V 24kΩ T676 U1 LP5522 Type Vendor Ceramic X5R TDK - - LED Red Osram - NSC 1.215 mm x 0.815 Size 0402 ...

Page 10

... National Semiconductor and the National Semiconductor logo are registered trademarks of National Semiconductor Corporation. All other brand or product names may be trademarks or registered trademarks of their respective holders. ...

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