User's Manual

Page 17 of 31
Signals offered by
IIC
The name of the correlative pins in
Mini PCIe Interface
SN. of the Mini
PCIe Interface
Description
I2C_SCL I2C_SCL 16 IIC Clock signal
I2C_SDA I2C_SDA
28 IIC Data signal
Notes: The IIC Bus 2.2K pull up resistance have been integrated in U6300.
2.2.7 UART interface*
U6300 offers a UART interface (RS232) by Mini PCIe Interface for debugging.
2.2.7.1 Description
The information about UART interface offered by U6300 is described in table 2.12 below.
Table 2.12 U6300 UART interface description
2.2.7.2 Reference circuit
The reference circuit of UART interface is shown in figure 2-12.
1）As the UART of U6300 can only supply TTL level while the PC serial port level is the RS232 level, the signal level
between them must use level transformation chip. The reference IC is SP3238EEA which produces by SIPEX, as
Signals offered
by UART
The name of the correlative
pins in
Mini PCIe Interface
SN. of the Mini PCIe
Interface
Description
DTR UART_DTR 46
DSR UART1_DSR 48
DCD UART_DCD 30
RI UART1_RI
32
Rx UART_RX 23
RTS UART_RTS 25
CTS UART_CTS 19
GND GND
4, 9, 15, 18,21, 26, 27, 29,
34, 35, 37, 40, 43, 50