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PDF FT639 Data sheet ( Hoja de datos )

Número de pieza FT639
Descripción Servo Controller Chip
Fabricantes ETC 
Logotipo ETC Logotipo



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No Preview Available ! FT639 Hoja de datos, Descripción, Manual

FerretTronics Control Circuits http://www.ferrettronics.com/
FerretTronics FT639 Servo
Controller Chip
Data Sheet
General Description:
The FT639 is an RC servo controller chip. The FT639 will
control five radio-controlled servos through one 2400 baud
serial line. It has a footprint of only eight pins. The only
external components required are two resistors and a diode for
an normal RS232 line such as the one found on a personal
computer. No components are needed for a 0-5 volt serial line
such as those found on the Parallax Basic Stamp . Just
connect the servo control lines directly to the chip and connect
the serial in line from a 2400 baud, No parity, 1 stop bit serial
source, and five RC servos can be controlled, (see circuit
setup).
Applications:
Radio control servo motors are used in remote control model
airplanes, cars, and boats. They are widely available and can be
used in robotics, automation, animation, and many other tasks.
The problem with using RC servo motors in the past was the
ability to control them. With the FT639 this is no longer a
problem. It is possible now to control five RC servo motors
with just one 2400 baud serial line. Each of the five RC servos
is independently controlled.
Voltage on V++:
Voltage on 2400 Baud
In:
Serial Line Setup:
3.0V - 5.5V
< = V++
2400 Baud, 8 Bit, No
parity, and 1 Stop Bit
Page 1 of 7

1 page




FT639 pdf
FerretTronics Control Circuits http://www.ferrettronics.com/
Circuit Diagram:
Note: For a serial line that has voltage from 0 to V++ requires
no diode resistor network. The line can be connected directly
to the serial-in pin on the FT639.
Example Code:
Other programming examples can be found at:
http://www.ferrettronics.com/software.html
'#########################################
'# This is a QBASIC programming example
'# For controlling the FT639
'#########################################
DECLARE SUB servoMove (servoNum!, value!)
Page 5 of 7
DECLARE SUB servo1 (value AS INTEGER)
DECLARE SUB servo2 (value AS INTEGER)
DECLARE SUB servo3 (value AS INTEGER)
DECLARE SUB servo4 (value AS INTEGER)
DECLARE SUB servo5 (value AS INTEGER)
CONST ACTIVE = 117
CONST LONGPULSE = 90
CONST SHORTPULSE = 85
CONST HEADER = 96
CONST SETUP = 122
' Opens COM Port 1 for sending out serial commands
OPEN
"COM1:2400,N,8,1,CD0,CS0,DS0,OP0,RS,TB2048,RB2048"
FOR RANDOM AS #1
' This command will put the FT639 in the setup
mode
PRINT #1, CHR$(SETUP);
' This command will put the FT639 in the long
pulse mode
PRINT #1, CHR$(LONGPULSE);
' This command will put the FT639 in the Short
pulse mode
'PRINT #1, CHR$(SHORTPULSE);
' This command will set the header at 3
PRINT #1, CHR$(HEADER + 3);
' This command will put the FT639 in the active
mode
PRINT #1, CHR$(ACTIVE);
'------------------------------------
' Loop to cycle through all positions
'------------------------------------
FOR i = 0 TO 255
' Cause a delay
FOR J = 1 TO 100000
NEXT J
' Moves the servos through all positions

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