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H330S Hardware User Manual
Page 33 of 44
VUSB, there must be input, or it cannot recognize USB port.
USB_DP and USB_DM are the high-speed differential signal line, and their highest transmission rate is
480Mbps. The following requirements should be followed in designing PCB layout.
USB_DP and USB_DM signal lines should have the same length, and should be parallel; avoid right
angle wiring;
USB_DP and USB_DM signal lines should be wrapped with GND at the ends.
USB2.0 differential signal line should be laid at the signal layer closest to the ground layer.
Ensure impedance matching; impedance is required to be 90ohm.
5.5 UART Interface
5.5.1 UART Interface Description
H330S wireless modules provide two UART for the users; one is standard 8-line serial port, and the other
2-line serial port.
The 8-line serial port UART1 supports full serial port mode with flow control function, and all the AT
commands. Users can download software or receive and dispatch AT through UART1. The 2-line serial
port UART2 only supports part of the AT commands.
Note:
UART2 only supports the ordinary query function.
The definitions of UART1 and UART2 signal interfaces are as follows:
UART1
Pin#
Pin Name
I/O
Description
35
UART1_RI
O
UART1 Ring Indicator
36
UART1_DSR
I
UART1 DTE Ready
37
UART1_DTR
O
UART1 DCE Ready
38
UART1_DCD
O
UART1 Carrier Detect
39
UART1_CTS
I
UART1 Clear to send
40
UART1_RTS
O
UART1 Request to send
41
UART1_TXD
O
UART1 Transmitted Data
42
UART1_RXD
I
UART1 Received Data
