GSM/GPRS/NB-IoT Module Series
BC68&M66 Compatible Design
BC68&M66_Compatible_Design 11 / 31
3
Pin Description
This chapter describes the pin definition of BC68 and M66, as well as the pin comparison between them.
Table 3: I/O Parameters Definition
The following table shows the comparison of pins between BC68 and M66.
Table 4: Pin Comparison between BC68 and M66
Symbol
Description
IO
Bidirectional
DI
Digital Input
DO
Digital Output
PI
Power Input
PO
Power Output
AI
Analog Input
AO
Analog Output
OD
Open Drain
Pin No.
BC68
M66
Pin Name
IO
Description
Pin Name
IO
Description
1
GND
AGND
Analog ground. Separate
ground connection for
external audio circuits
2
RESERVED
/
/
SPK2P
AO
Channel 2 voice output
3
RESERVED
/
/
MICP
AI
Positive voice input
4
RESERVED
/
/
MICN
AI
Negative voice input
signal
