Quectel BC68 Hardware Design

GSM/GPRS Module Series
M66 Hardware Design
M66_Hardware_Design Confidential / Released 32 / 80
Module
RTC
Core
VBAT
Power Supply
LDO/DCDC
LDO
VRTC
1.5K
Large Capacitance
Capacitor
Figure 13: VRTC is Supplied by a Capacitor
A rechargeable or non-chargeable coin-cell battery can also be used here, for more information, please
visit http://www.sii.co.jp/en/.
If you want to keep an accurate real time, please keep the main power supply VBAT alive.
3.7. Serial Interfaces
The module provides three serial ports: UART Port, Debug Port and Auxiliary UART Port. The module is
designed as a DCE (Data Communication Equipment), following the traditional DCE-DTE (Data Terminal
Equipment) connection. Autobauding function supports baud rate from 4800bps to 115200bps.
The UART Port:
 TXD: Send data to RXD of DTE.
 RXD: Receive data from TXD of DTE.
 RTS: Request to send.
 CTS: Clear to send.
 DTR: DTE is ready and inform DCE (this pin can wake the module up).
 RI: Ring indicator (when there is a call, SMS or URC output, the module will inform DTE with the RI
 pin).
 DCD: Data carrier detection (the validity of this pin demonstrates the communication link is set up).
NOTE
Quectel
Confidential

Quectel BC68 Specifications

General

Brand	Quectel
Model	BC68
Category	Control Unit
Language	English