Hardware Development Guide
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ME3630 mini-PCIE
ME3630 mini-PCIE
Figure 4–12 Connection Circuit of USB Signal
NOTE: The differential impedance should be controlled within 90ohm
.
4.12
UART
I
NTERFACE
4.12.1
D
ESCRIPTION OF
PIN
S
The wireless module supports the full UART interface with flow control function, which complies with the RS-232 interface protocol.
This UART port supports the programmable data width; programmable data stop bit and programmable parity check, and has an
independent TX and RX FIFOs (512 bytes for each). For the normal UART application (non-Bluetooth), the maximum baud rate is
230400bps, and the default baud rate is 115200bps. The PINs are defined as shown in Table below.
NOTE: This chapter is only used for PID MP0
.
Table 4-10 Definition of UART Signal
Signal Name
I/O
Description
UART1_RX
DI
UART port RX receive data
UART1_TX
DO
UART port TX transmit data
UART1_DSR
DO
Data is ready
UART1_RI
DO
Ringtone indicator
UART1_CTS
DI
UART port CTS clear to send
UART1_RTS
DO
preparing to receive
UART1_DTR
DI
Data terminal is ready
UART1_DCD
DO
Carrier detection
4.12.2
E
LECTRIC
F
EATURE
It is recommended that this UART interface be kept during the design and the testing point be reserved for the software
interconnection. If the module’s UART interface is connected with the host device, and the UART PWL of host device matches with
1.8V, the connection mode is as shown in figure below.