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Chapter 3 Hardware
54 Reference Manual LittleBoard 550
Table 3-22. Audio Interface Pin/Signal Descriptions (J28)
Pin # Signal Description
1 VIDEO_L Video audio signal in left channel
2 VIDEO_GND Video digital ground (Audio ground)
3 VIDEO_R Video audio signal in right channel
4 CD_L CD-ROM signal left channel
5 CD_GND CD-ROM digital ground (to Audio CODEC)
6 CD_R CD-ROM signal right channel
7 LINE_IN_L Line in signal left channel
8 LINE_IN_GND Line in digital ground (Audio ground)
9 LINE_IN_R Line in signal right channel
10 MIC1 Microphone in signal 1 or left channel
11 MIC_GND Microphone digital ground (Audio ground)
12 MIC2 Microphone in signal 2 or right channel
13 MIC_REF Microphone reference signal
14 NC/KEY Not connected - Key pin
15 PHONE_IN Phone signal in
16 PHONE_GND Phone digital ground (Audio ground)
17 MONO_OUT Monaural signal out
18 MONO_GND Monaural digital ground (Audio ground)
19 +AOUT_L + Audio Amplifier output signal left channel
20 AGND Audio Ground (-AOUT_L)
21 +AOUT_R + Audio Amplifier output signal right channel
22 AGND Audio Ground (-AOUT_R)
23 AGND Audio Ground
24 HP_L Headphone signal left channel (from Audio Amp)
25 HP_R Headphone signal right channel (from Audio Amp)
26 NC Not connected (Headphone In)
Notes: The shaded area denotes power or ground.