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Application Note
Debug interface when using
Embedded applications
With GT47-GT48
Page 2
Second edition (September 2003)
Sony Ericsson Mobile Communications. publishes this manual without making any warranty as to the
content contained herein. Further Sony Ericsson Mobile Communications. reserves the right to make
modifications, additions and deletions to this manual due to typographical errors, inaccurate information,
or improvements to programs and/or equipment at any time and without notice. Such changes will,
nevertheless be incorporated into new editions of this manual.
All rights reserved.
© Sony Ericsson Mobile Communications, 2003
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Contents
1
INTRODUCTION....................................................................................................................4
2 MODIFICATION OF THE HARDWARE INTERFACE FOR THE GT47 ............................... 5
2.1 ASSEMBLY PICTURE........................................................................................................... 5
2.2 SOLDER PADS DESCRIPTION: ............................................................................................. 6
2.3 OPERATION DESCRIPTION: ................................................................................................. 6
3 REFERENCES....................................................................................................................... 7
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1 Introduction
When using the GT47 with embedded applications, due to the hardware
configuration the debugging information is not normally available.
However it is possible to access this information if a level shifter is
attached to certain points on the GT47 PCB, this application note explains
how this is done.
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2 Modification of the hardware interface for the GT47
The required modification to the GT 47 is described here and should only
be done to development units
This feature is used if a customer wants to operate the GT47 in his
embedded environment with the SIM card inserted and still extract logging
data for debug purposes.
2.1 Assembly picture
GT47/GT48 Motherboard showing solder pads by SIM card holder
Pad 1:
Internal GT47
3.8V Supply
Pad 2:
Enable debug mode
after shortening to
3.8V Supply
Pad 3:
Serial debug
data stream
(RD3)
Pad 4:
Signal GND
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To solder the wires for the GT47 debug interface, the GT47 SIM-card
needs to be removed and four wires must be soldered to the main PCB as
shown in the picture above.
2.2 Solder pads description:
The solder pads are described as pad 1 - 4 in the picture above. The
following signals are available on the solder pads:
• Pad 1 - The GT47 internal power supply of 3.8V (Note: This does
not have short circuit protection).
• Pad 2 - Enable input for activating the debug mode. This pad must
be connected to the 3.8V supply for activation.
• Pad 3 - Debug data stream from GT47 UART RD pin.
• Pad 4 - GT47 system ground.
2.3 Operation description:
For the operation of the GT47 debug port the following interface should be
soldered to the GT47:
Connect pad 1 directly to pad 2.
Attach a RS232 level shifter (e.g. MAX3232) to pad 3 for converting 2.7V
RD signal to RS232 signal levels. The supply voltage of 3.8V and GND
can be used for supplying the level shifter.
The connections to the Sony Ericsson RS232 level shifter are as follows:
T1 ---------------------- Pad 3 on GT47 (RD3)
T2 ---------------------- Pad 1 and 2 on the GT47 (3.8v and debug pads)
T5 ---------------------- Pad 5 on the GT47 (Ground)
A level shifter is recommended in the application note ‘RS232 interface for
GT47-GT48 Embedded applications UART’ with a provisional part number
of ROA - 1280000.
Note: The current consumption on pad 1 must not exceed 50mA.
These modifications should only be performed by skilled and trained
personal.
All signals on the pads are not short circuit proof and are not ESD
protected.
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3 References
1. LZT 123 7698 Application Note - RS232 interface for GT47-GT48
Embedded applications UART’
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