Specifications

Product Technical Specification & Customer Design Guidelines

Interfaces

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This document is the sole and exclusive property of WAVECOM. Not to be distributed or divulged without

prior written agreement.

WA_DEV_Q64_PTS_001-003 January 9, 2009

Figure 31 : Power-ON sequence (no PIN code activated)

The duration of the firmware power-up sequence depends on:

• the need to perform a recovery sequence if the power has been lost during a

flash memory modification.

Other factors have a minor influence

• the number of parameters stored in EEPROM by the AT commands received so

far

• the deterioration of hardware components, especially the flash memory

• the temperature conditions

The

recommended

way to de-assert the ON/OFF signal is to use either an AT

command or WIND indicators: the application has to detect the end of the power-up

initialization and de-assert ON/OFF afterwards.

• Send an “AT” command and wait for the “OK” answer: once the initialization is

complete the AT interface answers « OK » to “AT” message

• Wait for the “+WIND: 3” message: after initialization, the Wireless CPU

, if

configured to do so, will return an unsolicited “+WIND: 3” message. The

generation of this message is enabled or disabled via an AT command.

Note:

• Please refer to the document [4] AT Command Interface Guide for Open AT

Firmware v6.5

for more information on these commands.

If the application manages hardware flow control, the AT command can be sent during the initialisation

phase.