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 becomes +5V of the logic power by using the internal switching FET Buck type
regulator. It becomes +3.3V to support the main power of the CPU by using external +3.3V 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 drives +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
00X offonoff on
010 onoffon off
0 1 1 off on on off
100 onoffon off
101 onoffoff on
11X onoffon off
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