HCD-GTR33/GTR55/GTR77
48
Pin No.
Pin Name
I/O
Description
54
STBY RELAY
O
Main power on/off control signal output "H":power on
55
NO-USE
-
Unused
56
NO-USE
-
Unused
57
MTK-VBUS-DET
O
Hub Power (V-DET) Control Port
58
LINE-MUTE
O
Line muting on/off control signal "L":muting on
59
R2A15216FP-CLK
O
Serial data transfer clock signal output to audio signal processor, R2A15216FP
60
R2A15216FP-DATA
O
Serial data output to audio signal processor, R2A15216FP
61
ST-TUNED
I
Tuned detection input from the tuner unit
62
VCC
-
Power supply terminal (+3.3V)
63
ST-CE
O
PLL chip enable signal output to the tuner unit
64
VSS
-
Ground terminal
65
ST-DIN
O
PLL serial data output to the tuner unit
66
MIC/HP_DET
I
Headphone & microphone connection detection signal input (A/D input)
67
ST-DOUT
I
PLL serial data input from the tuner unit
68
MTK-OC1
I
USB Overcurrent Detection input port 1
69
LED CTRL
O
Dynamic LED drive select signal output
70
TC-STATE
I
Tape playback/recording/stop status detection input signal (A/D input) (Only for African
model)
71
ILLUMINATOR-INPUT
I
Power illuminator & METER input signal detection (A/D input)
72
METER-IN4
O
Meter motor control signal output 4 (Only for HCD-GTR55 and HCD-GTR77)
73
MTK-OC2
I
USB Overcurrent Detection input port 2
74
POWER/DISPLAY-
KEY
I
POWER & DISPLAY key press detection signal (Interrupt input)
75
NO-USE
-
Unused
76
NO-USE
-
Unused
77
METER-IN3
O
Meter motor control signal output 3 (Only for HCD-GTR55 and HCD-GTR77)
78
METER-IN1
O
Meter motor control signal output 1 (Only for HCD-GTR55 and HCD-GTR77)
79
METER-IN2
O
Meter motor control signal output 2 (Only for HCD-GTR55 and HCD-GTR77)
80
USB-B LED
O
Dynamic LED drive signal output to the USB B Blue and Red LED “H”:LED on
81
METER SW
I
Min and Max switch input signal from METER (A/D input) (Only for HCD-GTR55 and
HCD-GTR77)
82
MTK PWR MON
I
MTK DMB Board power monitor input pin (A/D input)
83
OVERVOLTAGE
I
Over-voltage protection detection input terminal "L": over-voltage detected
84
AD-KEY2
I
Key input terminal (A/D input)
85
MASTER VOL
I
Jog dial pulse input from the MASTER VOLUME encoder (A/D input)
86
LED-VOL1,2
O
Dynamic LED drive signal output to the ILLUMINATION 1st indicator and 2nd indicator
“H”:LED on
87
AD-KEY1
I
Key input terminal (A/D input)
88
OUTPUT LEVEL
DETECT
I
Speaker Output Level Detection
89
VACS-IN
I
VACS level detection signal (A/D input)
90
LED-VOL5,6
O
Dynamic LED drive signal output to the ILLUMINATION 5th indicator and 6h indicator
“H”:LED on
91
LED-VOL3,4
O
Dynamic LED drive signal output to the ILLUMINATION 3rd indicator and 4th indicator
“H”:LED on
92
MODEL-IN
I
Model setting terminal (A/D input)
93
DEST-IN
I
Destination setting terminal (A/D input)
94
SW LED/USB A LED
O
Dynamic LED drive signal output to the Subwoofer LED and USB A LED indicator “H”:LED
on
95
STBY LED
O
LED drive signal output of POWER indicator "H":LED on
96
AVSS
-
Ground terminal (for A/D conversion)
97
AD-KEY0
I
Key input terminal (A/D input)
98
AREF
I
A/D Converter reference voltage input terminal (+3.3V)
99
AVCC
-
Power supply terminal (+3.3V) (for A/D conversion)
100
NO-USE
-
Unused
