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May 2013
© 2009 Fairchild Semiconductor Corporation www.fairchildsemi.com
FAN5646 • Rev. 1.0.3
FAN5646 — Programmable Indicator ―Soft‖ LED Blinker with TinyWire™ Interface
FAN5646
Programmable Indicator ―Soft‖ LED Blinker with TinyWire™
Single-Wire Interface
Features
LED “Soft” Blink: 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
– t
ON
and t
OFF
for Up to Two Pulses
High-Side Constant Current LED Driver:
– 20 mA Maximum Output Current
– 80 mV Drop-out at 20 mA I
OUT
– External R
SET
(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
TinyWire™ single-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.
1
2
3
5
4
LED+
CTRL
VIN
2.7 to 5.5V
0.1
GND
ISET
R=24.3kW
Figure 1. Typical Application
Ordering Information
Part Number
Option
Follow Bit Default
Temperature Range
Package
Packing
FAN5646UC00X
00
0
-40 to 85°C
WLCSP-4, 0.4mm Pitch
Tape and Reel
FAN5646S700X
00
0
-40 to 85°C
5-Lead SC70, EIAJ SC88
Tape and Reel
FAN5646UC01X
01
1
-40 to 85°C
WLCSP-4, 0.4mm Pitch
Tape and Reel
FAN5646S701X
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.
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