|
|
PDF FAN5645 Data sheet ( Hoja de datos )
| Número de pieza | FAN5645 | |
| Descripción | Indicator LED Blinker | |
| Fabricantes | Fairchild Semiconductor | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de FAN5645 (archivo pdf) en la parte inferior de esta página. Total 10 Páginas | ||
|
No Preview Available !
September 2007
FAN5645www.datasheet4u.com
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
CIN
0.1µF
Control
VIN
GND
CTRL
LED+
ISET
GND
Figure 1. Typical Application for the FAN5645
Ordering Information
Part Number
Package
FAN5645MPX MLP-6 3.0 x 3.0mm
Bluetooth® is a registered trademark of Motorola, Inc.
© 2006 Fairchild Semiconductor Corporation
FAN5645 • Rev. 1.0.0
Pb-Free Operating Temperature Range Packing Method
-40°C to 85°C
Tape and Reel
www.fairchildsemi.com
1 page  
Circuit Description
Operational Modes
At power up, the device is in STOP (“SLEEP”) mode
until a rising edge of a CTRL signal is detected and the
device goes into active mode. Depending upon the
www.datashsReieUgtn4Nua,.lcRaoUmppNlieOdNtCoEC,ToRr LF,OaLcLtiOveWmAoFdTeEcRanRbEeSETRT.AINING,
Initialization
The reference and the circuit remain in SLEEP mode
until VIN crosses the UVLO threshold and a rising edge
on the CTRL pin is detected. When the IC is in SLEEP
mode, all internal bias circuits are disabled. The training
registers are all reset to 0 at power up.
Training Mode
The IC can record a pattern of up to three distinct HIGH
(TON) and LOW (TOFF) times. These times are recorded
during training in six internal 8-bit counters, one counter
for each distinct TON and TOFF time. If the training pulse
ON or OFF time exceeds the maximum clock counts,
the value is held at the maximum.
TRAINING mode contains the following sequence:
1. Two control pulses, finished within TCMD1. The HIGH
time of the control pulses should be greater than 2µs
and less than 55µs. The LOW time between two
control pulses should be greater than 2µs.
2. CTRL held LOW, for at least TFTPR(MIN), but less than
TFTPR(MAX), measured from the first rising edge of the
control pulse.
3. Between one and three sets of training pulses, where
a training pulse defines the LED’s on time TON and
off-time TOFF.
4. Three control pulses finished within TCMD2 to signify
end of training. The HIGH time of the control pulses
should be greater than 2µs and less than 55µs. The
LOW time between two control pulses should be
greater than 2µs.
5. The IC enters STOP (SLEEP) mode and is able to
receive a new command only after TCMD2 expires.
6. If no end-of-training controls pulses are received after
TOFF3 maximizes out, the IC enters STOP (SLEEP)
mode automatically.
CTRL
TC PH IGH
TC PLOW
TFT PR
TCMD1
TON1
TOFF1
TON2
TOFF2
TON3
Figure 4. TRAINING Mode
TOFF3
T CMD2
RUN Mode
When CTRL is raised and held HIGH, and training
registers are not all zeros, repetitive playback of the
trained sequence commences. The delay between
CTRL HIGH and LED on is TDLY1. When CTRL
T DLY
subsequently goes LOW, the IC turns off the LED and
enters STOP (SLEEP) mode. After a TCMD2 time, a new
command can be processed.
CTRL
LED
Trained Sequence
TON1
Figure 5. RUN Mode
Run Once Mode
When the IC receives four consecutive control pulses
within TCMD1, followed by CTRL going HIGH after at
least TFTPR(MIN), but less than TFTPR(MAX), the IC plays
TCPHIGH
TFTPR
TCMD1
CTRL
TCPLOW
back the trained pattern once, then enters STOP
(SLEEP) mode after the trained sequence is completed.
This assumes that training registers are not all zeros.
Trained Sequence
LED
© 2006 Fairchild Semiconductor Corporation
FAN5645 • Rev. 1.0.0
TON1
Figure 6. RUN ONCE Mode
5
www.fairchildsemi.com
5 Page | ||
| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet FAN5645.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| FAN5645 | Indicator LED Blinker | Fairchild Semiconductor |
| FAN5646 | LED Blinker | Fairchild Semiconductor |
| Número de pieza | Descripción | Fabricantes |
| SLA6805M | High Voltage 3 phase Motor Driver IC. |
 Sanken |
| SDC1742 | 12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters. |
 Analog Devices |
|
DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares, |
| DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar |