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
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