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Fairchild Semiconductor Electronic Components Datasheet

FAN5646 Datasheet

LED Blinker

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May 2013
FAN5646
Programmable Indicator ―Soft‖ LED Blinker with TinyWire™
Single-Wire Interface
Features
LED “SoftBlink: with Logarithmic Fade Up and Fade
Down for Power Savings
Follow or Repeat Pattern Mode for Blinking when
Applications Processor is Powered Down
Default Pattern Optionally Modified using TinyWire
Single-Wire Digital Control for:
LED Current Rise / Fall Time
tON and tOFF for Up to Two Pulses
High-Side Constant Current LED Driver:
20 mA Maximum Output Current
80 mV Drop-out at 20 mA IOUT
External RSET (SC70 only) or Internal Current
Programming
35 A Operating Quiescent Current
Short-Circuit, Under-Voltage, and Thermal Protections
Wide Input Range: 2.7 to 5.5 V
4-Bump WLCSP, 0.4 mm pitch or
5-Lead SC70 (EIAJ SC88)
Applications
Cell Phone
Pocket PCs and Digital Cameras
Bluetooth® Headsets PMP and MP3 players
Description
The FAN5646 is a flexible and compact solution for a blinking
or “breathing” LED indicator. The internal programmable blink
algorithm eliminates any need for continual system processor
control. This means longer battery life for a hand-held system
because the system processor is not awakened from sleep
mode to blink an LED.
Very low dropout of 80 mV allows driving an LED without any
inductors or switch capacitors. LED blink rate, rise and fall
time, and CTRL line behavior can be programmed by a
TinyWiresingle-wire digital interface. The on-time and time
between pulses can be set for up to two different pulse widths.
The default for FAN5646 option 01 is “follow” mode, where the
LED turns on with the programmed rise time, then stays on as
long as CTRL remains HIGH. When CTRL falls, the LED turns
off at the programmed fall time. For option 00; when CTRL is
HIGH continuously, the LED repeats the programmed pattern.
The FAN5646 is available in a four-pin wafer-level chip-scale
package with 0.4 mm pitch or a five-lead SC70 package.
2.7 to 5.5V
0.1
VIN 1
GND 2
ISET
3
5 LED+
4 CTRL
R=24.3kW
Figure 1. Typical Application
Ordering Information
Part Number
FAN5646UC00X
FAN5646S700X
FAN5646UC01X
FAN5646S701X
Option Follow Bit Default Temperature Range
Package
Packing
00 0
-40 to 85°C
WLCSP-4, 0.4mm Pitch Tape and Reel
00 0
-40 to 85°C
5-Lead SC70, EIAJ SC88 Tape and Reel
01 1
-40 to 85°C
WLCSP-4, 0.4mm Pitch Tape and Reel
01 1
-40 to 85°C
5-Lead SC70, EIAJ SC88 Tape and Reel
Bluetooth® is a registered trademark of Bluetooth SIG, Inc.
Important: Contact a Fairchild Semiconductor sales representative for additional performance information and specifications.
© 2009 Fairchild Semiconductor Corporation
FAN5646 • Rev. 1.0.3
www.fairchildsemi.com


Fairchild Semiconductor Electronic Components Datasheet

FAN5646 Datasheet

LED Blinker

No Preview Available !

Pin Configuration
VIN A1 A2 LED+
GND B1 B2 CTRL
LED+ A2 A1 VIN
CTRL B2 B1 GND
Figure 2. WLCSP Top View: Bumps Facing Down Figure 3. WLCSP Bottom View: Bumps Facing Up
VIN 1
GND 2
ISET 3
5 LED+
4 CTRL
Figure 4. SC70-5 Top View
Pin Definitions
Pin #
WLCSP SC70-5
A1 1
A2 5
B1 2
B2 4
3
Name Description
VIN
LED+
GND
CTRL
ISET
Input Voltage. Connect to 2.7-5.5 VDC input power source.
LED Anode. LED current source output.
Ground.
Control pin. Logic input that controls programming and starts IC playback.
LED Current Setting. Full-scale LED current is set by tying this pin through a
resistor (RSET) to GND. If this pin is left open, an internal current reference is used.
© 2009 Fairchild Semiconductor Corporation
FAN5646 • Rev. 1.0.3
2
www.fairchildsemi.com


Part Number FAN5646
Description LED Blinker
Maker Fairchild Semiconductor
Total Page 13 Pages
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