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KDC-BT40U/BT645U
KDC-U546BT
Ref. No.
IC5
3.3V→5.0V Level Shift
IC6
5.0V→3.3V Level Shift
IC7
BU1.5V / BU3.3V Regulator
IC8
E2PROM (Not used)
IC9
A3.3V Regulator
Q3
D1.5V Output
Q5
B.3.3V Output
Q6
Control signal Inverter
Q7
APC (Auto Power Control)
Q9
Control signal Inverter
D1
Laser Diode Protection
Countermeasure against Static Elec-
D2,3
tricity
4
COMPONENTS DESCRIPTION
Application / Function
Operation / Condition / Compatibility
Converts communication signal from 3.3V to 5.0V.
Converts communication signal from 5.0V to 3.3V.
Power supply for digital back-up.
Power supply for mechanism μ-COM.
Memory for ROM correction.
Countermeasure for software malfunction.
Power supply for digital, analog and audio line.
The output voltage in which the power supply that diverges from the BU1.5V line
is turned on and off is used as D1.5V.
The output voltage in which the power supply that diverges from the BU3.3V line
is turned on and off is used as D3.3V.
Controls Q5.
Laser diode driver.
Because the detection logic of LOE/LIM_SW is different in the mechanism μ-COM
and the system μ-COM, the logic to the mechanism μ-COM side is reversed.
Prevents reverse bias which is applied to laser.
Laser destruction prevention.
The potential difference between DGND and AGND is absorbed, and the malfunc-
tion by static electricity is prevented.
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