Embedded testability
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This document is the sole and exclusive property of WAVECOM. Not to be distributed or divulged
without prior written agreement.
WM_PRJ_Q24NG_PTS_002-001 June
2006
9 Embedded testability
As for the upgrade procedure, the first thing to be checked is the
possibility to download easily a new software version or a test software in
the Q24NG. The necessary signals to proceed with the downloading are:
RX, TX, RTS, CTS, BOOT, ON/OFF, RESET and GND.
Prior to running the Wavecom downloader, the Q24NG has to be set in
download mode. For this, the BOOT signal has to be set to low while
powering ON (or resetting) the modem.
Typical implementation:
The first of the following diagrams specifies the way to route the specified
signals from the Q24NG to a connector to which the data cable will be
connected. This diagram has to be implemented on the application board.
The second diagram gives a typical data cable electrical scheme.
On the application board:
CHG_IN
BOOT
CT105 / RTS
CT104 / RX
CT108-2 / DTR
CT106 / CTS
GPIO_SDA
GPIO_SCL
CT103 / TX
VBATT
GND
GND
GND
GND
Figure 30: Example of serial link routing for downloading
