Fibocom MG661-EU - Page 25

2 Pin Definition
22
Pin
No.
Pin Name
I/O
RESET
VALUE
Power
Domain
Description
77
KEYIN2
DI
PU
1.8V
KEY input 2, cannot be pulled down
externally before boot, otherwise the
module will enter abnormal download
mode
85
KEYOUT6
DO
PD
1.8V
KEY output 6
84
KEYIN6
DI
PD
1.8V
KEY input 6
86
KEYOUT1
DO
PD
1.8V
KEY output 1
87
KEYIN1
DI
PU
1.8V
KEY input 1 and cannot be pulled down
before boot, otherwise the module will
enter the abnormal download mode
74
KEYOUT5
DO
PD
1.8V
KEY output 5
75
KEYIN5
DI
PD
1.8V
KEY input 5
Table 21. PCM/I2S interface
Pin
No.
Pin Name
I/O
RESET
VALUE
Power
Domain
Description
30
PCM_CLK
DO
PD
1.8V
PCM clock
31
PCM_SYNC
DO
PD
1.8V
PCM data synchronization signal
32
PCM_DIN
DI
PD
1.8V
PCM data input
33
PCM_DOUT
DO
PD
1.8V
PCM data output
6
I2S_MCLK
DO
PD
1.8V
I2S main clock output signal