Sharp QT-CD180(BL) Service Manual page 23

IC802 VHiTC9457F0-1: Servo/Signal Control (TC9457F0) (3/4)
Pin No. Port Name Terminal Name
63 SBAD SBAD
64 TEI TEI
65 TEZI TEZI
66 FOO FOO
67 TRO TRO
68 VREF VREF
69 RFGC RFGC
70 TEBC TEBC
71 FMO FMO
72 DMO DMO
73 2VREF 2VREF
74 SEL SEL
75 VDD VDD2
76 VDD VSS2
77 XVSS XVSS
78 XI XI
79 XO XO
80 XVDD XVDD
81 DVSR DVSR
82 RO RO
83 DVRR DVRR
84 DVDD DVDD
85 DVRL DVRL
86 LO LO
87 DVSL DVSL
88 NC NC
89* NC/VPP NC
90 /RST RESET
In this unit, the terminal with asterisk mark (*) is (open) terminal which is not connected to the outside.
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Input/Output
Input/Output Subbeam add signal input pin.
Input/Output Tracking error input pin.
This input is read when tracking servo is on.
Input/Output Tracking error zero-cross input pin.
Input/Output Focus equalizer output pin.
Input/Output Tracking equalizer output pin.
Input/Output Analog reference power supply pin.
Input/Output RF amplitude adjusting control signal output pin. It outputs 3-level PWM
signals. (PWM carrier = 88.2kHz)
Input/Output Tracking balance control signal output pin. It outputs 3-level PWM signals.
(PWM carrier = 88.2kHz)
Input/Output Focus equalizer output pin. It outputs 3-level PWM signals.
(PWM carrier = 88.2kHz)
Input/Output Disc equalizer output pin. It outputs 3-level PWM signals.
(PWM carrier = DSP block 88.2kHz, synchronized to PXO)
Input/Output Analog reference power supply pin. (2 x VREF)
Input/Output APC circuit on/off signal output pin.
When laser is on, this pin goes to a high-impedance state when UHS = low
and outputs a high when UHS = high
Input/Output CD unit's digital block power supply pins.
Input/Output Normally, apply 5V to VDD.
When not using a CD (CD off), this power supply can be turned off, with
only the controller power supply kept active, so that the controller alone is
operating. In this case, the CD off bit must be set to 1. When this bit is set
to 1, pins 11 through 18 and pins 39 through 42 all are changed for output
ports if they have been set for CD control signal input/output pins.
Input/Output CD's crystal oscillator power supply pins.
Normally, connect these pins to the power supply lines that are used in
common for the VDD and VSS pins.
Input/Output CD's crystal oscillator input/output pins.
Input/Output Normally, connect 16.934MHz here. This clock is used as the system clock
for the CD. After a system reset, it also is used as the system clock on the
controller side.
Input/Output CD's crystal oscillator input/output pins.
Normally, connect these pins to the power supply lines that are used in
common for the VDD and VSS pins.
Input/Output R-channel D/A converter unit ground pin.
Input/Output R-channel data forward output pin.
Input/Output R-channel reference voltage pin.
Input/Output D/A converter unit power supply pin.
Input/Output L-channel reference voltage pin.
Input/Output L-channel data forward output pin.
Input/Output L-channel D/A converter unit ground pin.
Input/Output NC pins. Normally, connect these pins to ground or leave them open.
Input/Output
Input Device's system reset signal input pin.
The device remains reset while RESET is held low and when RESET is
released back high, the CD unit becomes operational and the program
starts from address 0. Normally, a system reset is asserted when a voltage
of 2.7V or more is applied to VDD when it is at 0V (power-on reset).
Therefore, this pin must be pulled high when used for this purpose.
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QT-CD180
Function