User's Manual

M50 Hardware Design
M50_HD_V2.0 - 27 -
PCM_OUT 20 O PCM data output 0.25×VDD_EXT
VIHmin=
0.75×VDD_EXT
VIHmax=
VDD_EXT+0.3
VOHmin=
0.85×VDD_EXT
VOLmax=
0.15×VDD_EXT
PCM_SYNC 21 O PCM frame
synchronization
SD card
PIN NAME PIN
NO.
I/O DESCRIPTION DC
CHARACTERISTICS
COMMENT
SD_CMD 34 O SD command VILmin=0V
VILmax=
0.25×VDD_EXT
VIHmin=
0.75×VDD_EXT
VIHmax=
VDD_EXT+0.3
VOHmin=
0.85×VDD_EXT
VOLmax=
0.15×VDD_EXT
SD_CLK 35 O SD clock
SD_DATA0 36 I/O SD data
RF interface
PIN NAME PIN
NO.
I/O DESCRIPTION DC
CHARACTERISTICS
COMMENT
RF_ANT 63 I/O RF antenna pad Impedance of 50Ω
Other interface
PIN NAME PIN
NO.
I/O DESCRIPTION DC
CHARACTERISTICS
COMMENT
DOWNLOAD 3 I VILmin=0V
VILmax=
0.25×VDD_EXT
VIHmin=
0.75×VDD_EXT
VIHmax=
VDD_EXT+0.3
Keep this pin
open.
RESERVED 22~
33，
38~
39,
44,
58,
Keep these pins
open.
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