CIRCUIT DESCRIPTION
3.1.6.2 QUARTERHORSE FUNCTION
<1> PEN / MOTOR SUPPLY VOLTAGE REGULATOR
It receives the inputted power of +24V, and the power flows to the buck type regulator, which consists of the external N-chan-
nel FET and SCHOTTKY diode, to make +19.2V. The power uses as the main power of the ink head, CR, and LF, SS MOTOR.
<2> +5V REGULATOR
The +24V (inputted power) is supplied, and it b5V of the logic power by using the internal switching FET Buck type
regulator. It b3.3V to support the main power of the CPU by using ex3.3V Regulator, and the +3.3V becomes
+1.8V to support the internal power of the CPU by using +1.8 Regulator.
<3> RESET CIRCUIT
The Reset of the Quarter-horse starts to work when the +5V is going down under +4.75V. It has the 1.5~5 usec of Sensitivity
Timing Margin for preventing the minute shakiness of the power by ESD. Also, the Time Delay of the Reset can be controlled
from 1ms to 1s by the Capacitor when power on.
<4> MOTOR DRIVERS
The Quarter-horse drives one DC Motor and two stepping motors. The DC Motor 19.2V as the FULL H-BRIDGE, and
the direction information goes to the CPU via the Serial Interface port. Also, it is inputted the PWM Modulator from CPU. The
Stepping Motor is driven by the UNIPOLAR, and the phase information is transmitted to the CPU via the Serial Interface port.
1. DC MOTOR TRUTH TABLE
DCA
DCB
PWM
A high side
A low side
B high side
B low side
0
0
X
off
on
off
on
0
1
0
on
off
on
off
0
1
1
off
on
on
off
1
0
0
on
off
on
off
1
0
1
on
off
off
on
1
1
X
on
off
on
off
Содержание SF-335T
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