Document
FAN5645 — Indicator LED Blinker with Single-Wire Interface
September 2007
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FAN5645 Indicator LED Blinker with Single-Wire Interface
Features Records and plays back blink patterns Single-wire digital control of LED blink rate and intensity Resistor-programmable LED maximum current High-side constant-current driver topology: - 20mA maximum output - 40mV typical dropout at 20mA 33µA operating current Standard 1.8V logic Short-circuit protection Thermal Shutdown Protection Under-Voltage Lockout Protection 6-pin 3.0 x 3.0mm MLP package Applications
Cell Phones, Smart-Phones Pocket PCs, Bluetooth Headsets PDA, DSC, PMP, and MP3 Players Laptop Computers
®
Description
The FAN5645 is a flexible and compact solution for a blinking LED indicator. The internal programmable blink algorithm eliminates any need for continual system processor control. This means longer battery life for the hand-held system because the system processor is not awakened from sleep mode just to blink an LED. Very low dropout of 40mV allows driving an LED without any inductors or switch capacitors. An external resistor sets the LED output current level. LED blink rate and intensity is controlled by a simple one-wire interface. In shutdown mode, the supply current is reduced to 0.3µA (typical). The FAN5645 is available in 6-pin molded leadless package (MLP).
Typical Application
2.7 to 5.5V VBAT
C IN 0.1µF
VIN GND CTRL
LED+ ISET GND
R SET
Control
Figure 1. Typical Application for the FAN5645
Ordering Information
Part Number
FAN5645MPX
Package
MLP-6 3.0 x 3.0mm
Pb-Free Operating Temperature Range Packing Method
-40°C to 85°C Tape and Reel
Bluetooth® is a registered trademark of Motorola, Inc. © 2006 Fairchild Semiconductor Corporation FAN5645 • Rev. 1.0.0 www.fairchildsemi.com
FAN5645 — Indicator LED Blinker with Single-Wire Interface
Block Diagram
Under-Voltage UVLO Lockout Thermal Shutdown Protection
TSD
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CTRL
Input edge detector & timer
Oscillator
DATA
Control logic & memory
LED ON
Bandgap reference
Ref. current generator
Output current mirror
LED+
VIN GND ISET RSET
Figure 2. Block Diagram
Pin Configuration
GND LED+
1 6
VIN GND
2
P1 (GND)
5
ISET
3
4
CTRL
Top View
Figure 3. MLP Pin Assignments
Pin Definitions
Pin #
1 2 3 4 5 6
Name
GND LED+ ISET CTRL GND VIN
Description
Ground. 0V reference for all voltages. LED output. Connect to anode of LED. Current Set. Resistor to GND sets maximum LED current 1:400. Digital single wire interface. Program STOP/TRAIN/RUN sequences. Ground. 0V reference for all voltages. Power input.
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© 2006 Fairchild Semiconductor Corporation FAN5645 • Rev. 1.0.0
FAN5645 — Indicator LED Blinker with Single-Wire Interface
Absolute Maximum Ratings
Stresses exceeding the absolute maximum ratings may damage the device. The device may not function or be operable above the recommended operating conditions and stressing the parts to these levels is not recommended. In addition, extended exposure to stresses above the recommended operating conditions may affect device reliability. The absolute maximum ratings are stress ratings only.
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Symbol
ISET Voltage TJ TSTG TL ESD Junction Temperature Storage Temperature
Parameter
VIN, LED+, CTRL Voltage
Min.
-0.3 -0.3 -40 -65 HBM 7 2 8
Max.
+6.0 VIN+0.2 150 150 260
Unit
V V °C °C °C kV
Lead Soldering Temperature, 10 seconds Electrostatic Discharge Protection Level CDM HBM (on LED+ pin)
Recommended Operating Conditions
The Recommended Operating Conditions table defines the conditions for actual device operation. Recommended operating conditions are specified to ensure optimal performance to the datasheet specifications. Fairchild does not recommend exceeding them or designing to absolute maximum ratings.
Symbol
VIN IOUT RSET TA TJ Output Current
Parameter
Power Supply Voltage Range Resistor Used to Set LED Current Operating Ambient Temperature Range Operating Junction Temperature Range
Min.
2.7 1 24.7 -40 -40
Max.
5.5 20 494.0 +85 +125
Units
V mA kΩ °C °C
© 2006 Fairchild Semiconductor Corporation FAN5645 • Rev. 1.0.0
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FAN5645 — Indicator LED Blinker with Single-Wire Interface
Electrical Specifications
VIN = 2.7V to 5.5V, TA = -40°C to +85°C, Vf = 1.8V to (3.5V or VIN-0.1V, whichever is smaller). Typical values are at TA = 25°C, VIN = 3.6V, and Vf = 2.5V.
Symbol
Parameter
Conditions
VIN = 3.6V VIN = 3.6V, ILED = 0mA
Min.
Typ.
0.30 33
Max.
0.75 55
Units
µA µA V
Power Supplies Shutdown current in STOP www.datasheet4u.com ISD (sleep) mode IIN VIH VIL IIH VUVLO Regulation IOUT Maximum regulated output current Minimum regulated output current Maximum LED ripple current ISET accuracy IOUT load regulation IOUT line regulation ISET voltage ISET current limit Current mirror ratio VDROPOUT ISC TSD Timing fOSC TOSC tON tOFF Internal oscillator frequency Oscillator stability LED on-time resolution LED off-time res.