1 Hardware - ExpressLink
1.1 Block diagram1.2 Pin definitions

1 Hardware

1.1 Block diagram

Figure 1 - Simplified block diagram

Figure 1 - Simplified block diagram

1.2 Pin definitions

1.2.1   GND (input) – Ground

1.2.2   VCC (input) – 3.3v

1.2.3   TXD (output) – Serial interface Universal Asynchronous Receiver the Transmitter (UART) TX from module

UART output to the host processor/application processor.

1.2.4   RXD (input) – Serial interface Universal Asynchronous Receiver the Transmitter (UART) RX to module

UART input to the ExpressLink, from the host processor/application processor.

1.2.5   RST (input) – holds module in reset

When asserted (low), the ExpressLink module is held in reset (low power, disconnected, all queues emptied and error conditions cleared).

1.2.6   WAKE (input) – low-power sleep mode wakeup

When not asserted (high), the ExpressLink module is allowed to enter a low power sleep mode. If in low power sleep mode and asserted (low), this will awake the ExpressLink module.

1.2.7   Event (output) – Asynchronous Event Flag

When asserted, the ExpressLink module indicates to the host processor that an event has occurred (disconnect error or message received on a subscribed topic) and a notification is available in the event queue waiting to be delivered. It is de-asserted when the event queue is emptied. A host processor can connect an interrupt input to this signal (rising edge) or can poll the event queue at regular intervals (see 7.2.1 EVENT? ⁞  Request the next event in the queue).