Fairchild FAN5646 Programmable indicator â softâ led blinker with tinywireâ ¢ single-wire interface Datasheet

FAN5646
Programmable Indicator “Soft” LED Blinker with TinyWire™
Single-Wire Interface
Features
Description
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LED “Soft” Blink: with Logarithmic Fade Up and Fade
Down for Power Savings
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Follow or Repeat Pattern Mode for Blinking when
Applications Processor is Powered Down
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Default Pattern Optionally Modified using TinyWire™
Single-Wire Digital Control for:
– LED Current Rise / Fall Time
– tON and tOFF for Up to Two Pulses
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.
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High-Side Constant Current LED Driver:
– 20mA Maximum Output Current
– 80mV Drop-out at 20mA IOUT
– External RSET (SC70 only) or Internal Current
Programming
35μA Operating Quiescent Current
Short-Circuit, Under-Voltage, and Thermal Protections
Wide Input Range: 2.7 to 5.5V
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.
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 0.4mm pitch or a five-lead SC70 package.
4-Bump WLCSP, 0.4mm pitch or
5-Lead SC70 (EIAJ SC88)
Applications
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Cell Phone
Pocket PCs and Digital Cameras
®
Bluetooth Headsets PMP and MP3 players
Figure 1. Typical Application
Ordering Information
Part Number
Option
Follow Bit
Default
Temperature
Range
FAN5646UC00X
00
0
-40 to 85°C
Green
WLCSP-4, 0.4mm Pitch
Tape and Reel
FAN5646S700X
00
0
-40 to 85°C
Green
5-Lead SC70, EIAJ SC88
Tape and Reel
FAN5646UC01X
01
1
-40 to 85°C
Green
WLCSP-4, 0.4mm Pitch
Tape and Reel
FAN5646S701X
01
1
-40 to 85°C
Green
5-Lead SC70, EIAJ SC88
Tape and Reel
Eco Status
Package
Packing
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
FAN5646 — Programmable Indicator “Soft” LED Blinker with TinyWire™ Interface
August 2009
FAN5646 — Programmable Indicator “Soft” LED Blinker with TinyWire™ Interface
© 2009 Fairchild Semiconductor Corporation
FAN5646 • Rev. 1.0.1
www.fairchildsemi.com
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