User's Manual

27
MBIAS
IO
IO
Bias of microphone
When microphone bias is not used, pin sharing is
GPIO
28
GND
Table 7：PIN Terminal Description
6. Physical Interfaces
6.1Power Supply
¾ The module power supply 3v coin cell batteries or DC 3.3v
¾ Power supply pin connection capacitor to chip and pin as far as possible close
¾ Capacitor decouples power to the chip
¾ Capacitor prevents noise coupling back to power plane.
Figure 2： Power Supply PCB Design
6.2 UART
The MC17 embeds UART to implement full-duplex transmission and reception. Both TX and
RX interface are 4-layer FIFO interface. Hardware flow control is also support via RTS and
CTS.
Figure 3： Connection To Host Device
Note: The maximum baud rate is 2400 baud during deep sleep.
EH-MC1f7 Datasheet