lp5522tmx National Semiconductor Corporation, lp5522tmx Datasheet

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lp5522tmx

Manufacturer Part Number
lp5522tmx
Description
Programmable Led Driver
Manufacturer
National Semiconductor Corporation
Datasheet
© 2007 National Semiconductor Corporation
LP5522
Programmable LED Driver
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.
Typical Application
202172
Features
Applications
Programmable blinking sequence
— 1 to 3 programmable pulses
— 1 ms to 255 ms LED on time
— 10 ms to 2500 ms LED off time
— Single or continuous run of programmed blinking
Constant current high side output driver
Adjustable current with external resistor
0.2 uA typical shutdown current
Autonomous operation without external clock
Micro SMD-6 package with 0.4 mm pitch:
1.215 mm x 0.815 mm x 0.6 mm (LxWxH)
Indicator lights
Phone cosmetics
Toys
sequence
20217201
www.national.com
June 2007

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lp5522tmx Summary of contents

Page 1

... 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. Typical Application © 2007 National Semiconductor Corporation Features ■ Programmable blinking sequence — programmable pulses — ...

Page 2

... Connection Diagrams and Package Mark Information Connection Diagrams Micro SMD-6 package, 0.815 x 1.215 x 0.60 mm body size, 0.4 mm pitch NS Package Number TMD06AAA Top View PACKAGE MARK ORDERING INFORMATION Order Number LP5522TM LP5522TMX PIN DESCRIPTIONS Pin Name A1 VDD B1 ISET C1 CTRL A2 LED B2 GND C2 GNDT A: Analog Pin D: Digital Pin G: Ground Pin P: Power Pin I: Input Pin O: Output Pin www ...

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Absolute Maximum Ratings If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. V (VDD, LED, ISET) Voltage on logic pin (CTRL) -0.3V to VDD +0.3V Continuous Power Dissipation (Note 3) Junction ...

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Note 4: For detailed soldering specifications and information, please refer to National Semiconductor Application Note AN1112 : Micro SMD Wafer Level Chip Scale Package. Note 5: The Human body model is a 100 pF capacitor discharged through a 1.5 kΩ ...

Page 5

Modes of Operation RESET In the reset mode all functions are off and all registers are reset to the default values. Reset is entered always if internal Power On Reset (POR) is active. Power On Reset will activate during the ...

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LED Driver Operational Description The LP5522 LED driver is constant current source. Current can be set with external resistor (R resistor and LED is 1:400. R current correlates to ISET reference voltage (V ISET adjusted using equation I = 480/R ...

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Line Regulation Control Interface Operational Description LP5522 has one digital control input, CTRL. Threshold levels of CTRL input are fixed to enable control from low voltage controller. CTRL signal is used to control the mode of the circuit. A rising ...

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LED Controller Commands and Operation There are four commands available for LP5522. Command Run Training start Training end Run once RUN COMMAND One rising edge of CTRL signal within command entering period is interpreted as Run command. In programmed mode ...

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RUN ONCE COMMAND Programmed blinking sequence is performed once after Run Once command. Four rising edges of CTRL signal within command entering period is interpreted as Run Once command. If CTRL is kept high after command entering period the programmed ...

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TRAINING END COMMAND Blinking sequence programming ends once Training End command is introduced. Three rising edges within time period interpreted as Training End command. Note that blank period is also reguired after Training End command. During blanc ...

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LED OFF time counter can saturate also if Training end command is not given or no new ON time has been started. In this case saturated OFF time is recorded and chip goes to Standby. Recommended External Components INPUT CAPACITOR, ...

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Physical Dimensions The dimension for X1, X2 and X3 are as given: — 0.815 mm ±0.03 mm — 1.215 mm ±0.03 mm — 0.60 mm ±0.075 mm See National Semiconductor Application Note 1112 Micro ...

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Notes 13 www.national.com ...

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... 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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