Pioneer VSX-45TX Service Manual page 139

5
PCM2902EG (COAXIAL IN ASSY: IC1681)
• USB Codec IC
Pin Assignment (Top view)
Pin Function
No. Pin Name
I/O
1 D+ I/O
2 D– I/O
3 VBUS I
−
4 DGNDU
5 HID0 I
6 HID1 I
7 HID2 I
8 SEL0 I
9 SEL1 I
−
10 VCCCI
−
11 AGNDC
12 VINL I
13 VINR I
−
14 VCOM
15 VOUTR O
16 VOUTL O
−
17 VCCP1I
−
18 AGNDP
−
19 VCCP2I
20 XTO O
21 XTI I
−
22 AGNDX
−
23 VCCXI
24 DIN I
25 DOUT O
−
26 DGND
−
27 VDDI
28 SSPND O
(1) LV-TTL level
(2) 3.3-V CMOS level input
(3) 3.3-V CMOS level input with internal pulldown. This pin informs the PC of serviceable control signals such as mute, volume up, or
volume down, which has no connection with the internal DAC or ADC directly. See the volume control and mute control section.
(4) Connect a decouple capacitor to GND
(5) 3.3-V CMOS level input with internal pulldown, 5 V tolerant
(6) TTL Schmitt trigger, 5 V tolerant
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6
USB differential input/output plus(1)
USB differential input/output minus(1)
Connect to USB power (VBUS)
Digital ground for USB transceiver
HID key state input (mute), active high(3)
HID key state input (volume up), active high(3)
HID key state input (volume down), active high(3)
Must be set to high(6)
Must be set to high(6)
Internal analog power supply for codec(4)
Analog ground for codec
ADC analog input for L-channel
ADC analog input for R-channel
Common for ADC/DAC (VCCCI/2) (4)
DAC Analog output for R-channel
DAC analog output for L-channel
Internal analog power supply for PLL(4)
Analog ground for PLL
Internal analog power supply for PLL(4)
Crystal oscillator output
Crystal oscillator input(2)
Analog ground for oscillator
Internal analog power supply for oscillator(4)
S/PDIF input(5)
S/PDIF output
Digital ground
Internal digital power supply(4)
Suspend flag, active low (Low: suspend, High: operational)
6
7
Pin Function
VSX-45TX
7
8
A
B
C
D
E
F
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