ST67W611M1 UART interface

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1. Introduction

The ST67W611M1 has a built-in UART interface which is used to flash the module binary, retrieve the module's OTP values and also to perform RF tests with the RF test tool. Selection is done following the bootstrap configuration as described in the BOOT section.

The interface is mapped on the following module pins:

  • UART_RX (23) pin: UART data to the module.
  • UART_TX (22) pin: UART data from the module.

2. UART interface specification and features

The UART interface comes with various features, and it is configured as follows:

  • Full-duplex asynchronous communication
  • Data bit length: 8 bits
  • Stop bit length: 1 bit
  • Parity: None
  • Hardware flow control (RTS/CTS): None
  • Baud rate: 2000000 Bauds

3. UART interface hardware implementation

The module UART pins must be routed to the host UART pins. Both signals are push-pull and there is therefore no need for on-board pull-ups.

There are no specific constraints on routing these two signals since UART is not used during normal operation as explained above.