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参数资料
| 型号： | LC78681E |
| 元件分类： | 消费家电 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP64 |
| 封装： | QFP-64 |
| 文件页数： | 3/23页 |
| 文件大小： | 241K |
| 代理商： | LC78681E |
Note: * For constant linear velocity servo control commands, the TOFF pin is low only in the CLV mode; otherwise it is high. Control of the TOFF pin by
command is effective only in the CLV mode.
1. CLV Mode
In the CLV (constant linear velocity) mode, the LC78681E detects disc speed from the HF signal and switches the
internal DSP mode to perform various types of control for maintaining the correct linear velocity. The pulse-width
modulation cycle is 7.35 kHz, and the 1/64 duty cycle is 1.114 s. V/P outputs high during rough servo and low
during phase control.
2. CLV Control Gain Switching
CLV control gain during rough switching for 8-cm discs can be set at 8.5 dB lower than for 12-cm discs.
3. Internal Brake Mode
The internal brake mode is enabled when an Internal Brake On command (C5H) is input. Executing a Brake
command (06H) in this mode allows the deceleration of the disk to be monitored at the WRQ pin.
In this mode, the EFM signal density per frame can be counted to determine the status of disc deceleration. When
there are fewer than four EFM signals, CLV– falls to low, and the WRQ pin simultaneously goes high to indicate that
brakes is completed. The microprocessor issues a Stop command when it senses that the WRQ pin is high, thereby
completing the stopping of the disc.
No. 4521-11/23
LC78681E
Internal mode
CLV+
CLV–
V/P
Rough servo (velocity too low)
High
Low
High
Rough servo (velocity too high)
Low
High
Phase control (PLCK locked)
PWM
Low
MSB
LSB
Command
RES = low
1 0 1 0 1 0 0 0
DISC 8 set
1 0 1 0 1 0 0 1
DISC 12 set
MSB
LSB
Command
RES = low
1 1 0 0 0 1 0 1
Internal brake on
1 1 0 0 0 1 0 0
Internal brake off
1 0 1 0 0 0 1 1
Internal brake control
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