Kenwood KDC-BT7539U Service Manual page 7

MICROCOMPUTER'S TERMINAL DESCRIPTION
Pin No. Pin Name I/O
30 PAN_PAN_DATA I
31 PAN_SYS_REQ O
32 PAN_PAN_REQ I
33 BT_SYS_DATA O
33 NC O
34 BT_BT_DATA I
34 NC O
35 NC O
36 PON_ILL I/O
37 NC O
38 PON_PANEL I/O
39 ROMCOR_DET I
39 EPM I
40 CD_MOTOR O
41 CD_LOE_LIM_SW I
42 CD_LOS_SW I
43 CD_DISC12_SW I
44 PAN_SC_CON O
45 CD_LOEJ I/O CD motor control terminal
46 S_SOC_REQ I
46 NC O
47 SOC_SSTOP O
47 CD_SRAMSTB O
48 SOC_SRST O
48 CD_RST O
49 S_SYS_REQ O
49 CD_CCE O
50 SOC_MUTE I
50 CD_MUTE I
51 PON_D5V I/O
52 PON I/O Power supply control terminal
53 OEM_DISP_DATA I/O External display DATA
53 NC O
Application
Data from panel to system μ-com
(Panel → System μ-com)
Communication request from system
μ-com to panel (System μ-com → Panel)
Communication request from panel to
system μ-com (Panel → System μ-com)
Data from system μ-com to BT module
(System μ-com → BT module)
Not used (Models without BT)
Data from BT module to system μ-com
(BT module → System μ-com)
Not used (Models without BT)
Not used
Panel LED
FL bias power supply control
Not used
Power supply for panel μ-com
Supply FL_VDD
ROM correction writing request
EPM input terminal for re-writing
Rewritable when EPM input terminal is "L"
when starting to re-write.
CD motor control terminal
CD detection terminal (Chucking SW)
CD loading detection terminal
CD disk detection terminal (12cm)
Panel operation control terminal
CE when re-writing system μ-com
Communication request from SOC to
system μ-com (SOC → System μ-com)
Not used (Models without USB)
SOC stop terminal
Decoder SRAM STANDBY control
(Models without USB)
SOC reset terminal
CD mechanism μ-com RST terminal
Communication request from system
μ-com to SOC (System μ-com → SOC)
Command I/F
CD mechanism chip enable terminal
DAC mute request
DAC mute request
For USB /FDC 5V power supply control
terminal
Not used (Models without BT/Models
without OEM_DISP)
KDC-BT7539U/BT8041U
/BT8141UY/BT838U
Truth
Processing Operation Description
value table
UART MAX 500k
Output is fi xed to L
Output is fi xed to L
Output is fi xed to L
H: Power ON
Hi-Z: When panel is detach and power is OFF
Output is fi xed to L
H: Power ON
Hi-Z: When panel is detach and power is OFF
H: Can re-write ROM correction (I2C open)
H: Loading completed, L: No disc
L: Ejection completed
L: 12cm disc
H: In normal condition, L: Stop the panel
Output is fi xed to L
H: Normal, L: Stop SOC
L: SRAM standby (6E**)
H: Normal, L: Reset (Bolero)
H: Normal, L: Reset
H: Mute request, L: In normal condition
L: Mute request, H: In normal condition
H: ON, Hi-Z: OFF
H: ON, Hi-Z: OFF
External display
Output is fi xed to L
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