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PDF EDE1204 Data sheet ( Hoja de datos )
| Número de pieza | EDE1204 | |
| Descripción | Bi-Polar Stepper Motor IC | |
| Fabricantes | E-Lab | |
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EDE1204 Bi-Polar Stepper Motor IC
Coil B Control Signal 1
Coil B Control Signal 2
Connect to +5V DC 3
Connect to +5V DC 4
Digital Ground 5
0 = Disable Motor Drivers 6
1 = Clockwise, 0 = Counter-Clockwise 7
1 = Normal Stepping, 0 = Half-Stepping 8
Single-Step on Falling Edge in 'STEP' mode 9
EDE1204
Coil B
Coil A
Coil B
Coil A
+5V
OSC1
+5V
OSC2
GND
+5V
Free Spin
C
Direction
B
Half-Stepping A
Step Run
18 Coil A Control Signal
17 Coil A Control Signal
16 Oscillator Connection
15 Oscillator Connection
14 Connect to +5V DC
13 Speed Control (MSB)
12 Speed Control
11 Speed Control (LSB)
10 1 = 'STEP' mode, 0 = 'RUN' mode
The EDE1204 Bi-Polar Stepper Motor IC is a 5 volt, 18 pin package designed to control a Bi-Polar (4
wire) stepper motor. The EDE1204 is capable of self-clocking in the free-standing 'RUN' mode, as
well as external clocking in the 'STEP' mode. In addition, half-stepping and directional control are
also available. The TTL-level outputs sequence dual H-Bridges (one per coil) such as the L293 Dual
H-Bridge IC or dual H-Bridges made from discrete transistors (see schematics section). The
EDE1204 features the ability to change the stepping rate while the motor is stepping and to self-
clock an unlimited number of steps in continuous 'RUN' mode. Inputs are TTL/ CMOS compatible.
RUN mode
In the 'RUN' mode, activated by a low on pin 10, the EDE1204 will cause the motor to rotate
according to the following parameters:
Direction (pin 7): 1 = clockwise, 0 = counter-clockwise
(If a clockwise command causes counterclockwise rotation of motor, reverse the
sequence of the motor’s four phase wires.)
Half-Stepping (pin 8): 1 = normal stepping, 0 = half stepping (doubles step resolution)
Speed Control [C,B,A] (pins 13,12,11): these three active-low bits select one of eight
rotational speeds. Refer to Tables One & Two below for speed range details.
Note: Throughout this datasheet, "1" refers to +5V, and "0" refers to 0V (Ground).
©COPYRIGHT 1998 E-LAB Digital Engineering, Inc. All rights reserved. Page 1
1 page  
Connection via Eight-NPN Transistor H-Bridge (full EDE1204 schematic not shown)
The above circuit utilizes eight NPN transistors. For low-current applications, inexpensive 2N2222
NPN transistors may be used. For higher currents, higher-capacity transistors may be used. One
suitable choice would be ZETEX ZTX690B (high-gain NPN), capable of up to 2A continuous
current. (ZETEX Semiconductor's web site iswww.zetex.com ) If a typical, low-gain power
transistor is used, such as the MJE3055T, you may need to modify resistor values due to these
transistors' lower current gain. Notice that the four diodes connecting the emitters to the collectors
must be capable of carrying the motor coil current, and that the eight clamping diodes must be fast
enough for the maximum motor speed to be used. In most instances, a 1N4007 or 1N5408 works
well for the four emitter-collector diodes, and a 1N4007 works well for the eight clamping diodes.
One advantage of using all NPN transistors for the drive circuitry is that it lowers the possibility of
confusion during board assembly & production. Also, using only eight transistors, it results in a
lower production cost than most typical H-Bridge circuits.
©COPYRIGHT 1998 E-LAB Digital Engineering, Inc. All rights reserved. Page 5
5 Page | ||
| Páginas | Total 7 Páginas | |
| PDF Descargar | [ Datasheet EDE1204.PDF ] | |
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