User's Manual

Table Of Contents

SiFLEX02 TRANSCEIVER MODULE

MODULE USER’S GUIDE

4 Wakeup/Reset Alerts

See host message types 0x1C (Set Wakeup/Reset Settings) and

0x9E (Wakeup/Reset Alert Status) in the SiFLEX Host Protocol

User’s Guide to use the features described below.

4.1 Wakeup Alert

The Wakeup Alert Status message can be used to alert the host microcontroller when it

wakes up from sleep. This useful for two main reasons:

• The host microcontroller knows that the SiFLEX module is ready to operate and can then

accept commands over the host interface.

• The host microcontroller knows the SiFLEX module has woken up from sleep due to an

errant condition. For example if noise appeared on the SiFLEX wakeup input pin and the

host microcontroller did not know it was out of sleep and drawing current, the power budget

could be exceeded.

To wake the SiFLEX module out of sleep simply send a dummy byte to the module. The

SiFLEX module will wake up from sleep in under 1mS, at which point the Wakeup Alert

Status message will be sent to the host, if enabled.

4.2 Reset Alert

The Reset Alert Status message can also be used to alert the host microcontroller when

the module has been reset. This useful so the host microcontroller knows that the

SiFLEX module is ready to operate and can then accept commands over the host

interface.

The information in this document is subject to change without notice.

Confirm the data is current by downloading the latest revision from www.lsr.com.