Telit Wireless Solutions LE915A P Series, Руководство по конструкции аппаратуры

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LE915Ax-P
Hardware Design Guide
1VV0301680 Rev. 2
Page 23 of 51 2021-10-04
Not Subject to NDA
Figure 4: example of USB interface circuit
Note: On the application board. It is highly recommended to insert an
optional connector or test points that can be switched for direct
connection of the external PC for a later SW upgrade or debugging.
5.2.2. UART Interfaces
The LE915Ax-P supports one HS UART up to 921600bps with HW flow control and two LS
UARTs up to 115200bps without flow control.
Table 14 : UART interfaces
Several configurations can be designed for the serial port on the OEM hardware, but the
most common are:
• RS232 PC com port
• microcontroller UART @ 1.8V (Universal Asynchronous Receive Transmit)
Pin
Signal I/O
Function description
25 UART2_SIN I Serial data input from DTE
26 UART2_SOUT O Serial data output to DTE
23 UART2_CTS I Input for Clear to Send from DTE
24 UART2_RTS O Output for Request to Send to DTE
21 UART0_SIN I Serial data input from DTE
22 UART0_SOUT O Serial data output to DTE
119 UART1_SIN I Serial data input from DTE
131 UART1_SOUT O Serial data output to DTE