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LC78622E Scheda tecnica(PDF) 10 Page - Sanyo Semicon Device |
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LC78622E Scheda tecnica(HTML) 10 Page - Sanyo Semicon Device |
10 / 29 page No. 5480-10/29 LC78622E • Two-byte commands (RWC set once: Sets up the digital attenuation and the general-purpose I/O ports) • Command noise rejection This command reduces the noise on the CQCK clock signal. While this is effective for noise pulses shorter than 500 ns, the CQCK timings tWL, tWH, and tSU, must be set for at least 1 µs. 6. CLV Servo Circuit; Pin 12: CLV+, pin 13: CLV–, pin 14: V/P The CLV+ pin provides the signal that accelerates the disk in the forward direction and the CLV– pin provides the signal that decelerates the disk. Commands from the control microprocessor select one of four modes; accelerate, decelerate, CLV and stop. The table below lists the CLV+ and CLV– outputs in each of these modes. Note: CLV servo control commands can set the TOFF pin low only in CLV mode. That pin will be at the high level at all other times. Control of the TOFF pin by microprocessor command is only valid in CLV mode. MSB LSB Command RES = low 1 1 1 0 1 1 1 1 COMMAND INPUT NOISE REDUCTION MODE 1 1 1 0 1 1 1 0 RESET NOISE EXCLUSION MODE q q MSB LSB Command RES = low 0 0 0 0 0 1 0 0 DISC MOTOR START (accelerate) 0 0 0 0 0 1 0 1 DISC MOTOR CLV (CLV) 0 0 0 0 0 1 1 0 DISC MOTOR BRAKE (decelerate) 0 0 0 0 0 1 1 1 DISC MOTOR STOP (stop) q q Mode CLV+ CLV– Accelerate High Low Decelerate Low High CLV Pulse output Pulse output Stop Low Low |
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