August 2009
FAN5646
Programmable Indicator “Soft” LED Blinker with TinyWire™
Single-Wire Interface
Features
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.
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:
Very low dropout of 80mV 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.
–
–
LED Current Rise / Fall Time
tON and tOFF for Up to Two Pulses
High-Side Constant Current LED Driver:
–
–
–
20mA Maximum Output Current
80mV Drop-out at 20mA IOUT
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.
External RSET (SC70 only) or Internal Current
Programming
35μA Operating Quiescent Current
The FAN5646 is available in a four-pin wafer-level chip-scale
package with 0.4mm pitch or a five-lead SC70 package.
Short-Circuit, Under-Voltage, and Thermal Protections
Wide Input Range: 2.7 to 5.5V
4-Bump WLCSP, 0.4mm pitch or
5-Lead SC70 (EIAJ SC88)
Applications
Cell Phone
Pocket PCs and Digital Cameras
Bluetooth® Headsets PMP and MP3 players
Figure 1. Typical Application
Ordering Information
Follow Bit Temperature
Part Number Option
Package
Packing
Eco Status
Default
Range
FAN5646UC00X
FAN5646S700X
FAN5646UC01X
FAN5646S701X
00
00
01
01
0
0
1
1
-40 to 85°C
-40 to 85°C
-40 to 85°C
-40 to 85°C
Green
Green
Green
Green
WLCSP-4, 0.4mm Pitch
Tape and Reel
5-Lead SC70, EIAJ SC88 Tape and Reel
WLCSP-4, 0.4mm Pitch Tape and Reel
5-Lead SC70, EIAJ SC88 Tape and Reel
For Fairchild’s definition of “green” Eco Status, please visit: http://www.fairchildsemi.com/company/green/rohs_green.html.
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. 1.0.1
www.fairchildsemi.com