Earthmate rev. 2 Project
Linux




! WARNING !

Taking apart your Earthmate can void your warranty, not to mention you can seriously mess it up if anything goes wrong.
I will not be held responsible for any damages inflicted by yourself upon your Earthmate.
Keep the above in mind before you decide on taking your own Earthmate apart!

The Outside Cover

(top) As you can see, there are three phillips screws holding the unit together. Inside this I found a metal box containing the below.

To the left, is the antenna assembly (pink thing with metal casing). This houses a pc board as well...it even has a SiRF chip in there along with other components. The hole on the bottom of the upper metal casing (antenna assembly on the right) contains the connector housing for the pins on the bottom pc board (8 pins in all).
Refer to PC Board 2 (top) for more information.

The image on the left, displays the pc board that was attached to the metal casing on the bottom of the metal box. This pc board is my primary target of interest...as it has the usb controller on the bottom of it, along with the SiRF chip on the top. When I say "it was attached", I mean to get it off I had to desolder the board from the casing on one spot...shown below (it's above the usb controller and opposite the cable connector). This is where you could mess your board up...though I encountered little difficulty when putting it back together...you may not.

The above image (middle) shows the overview of the bottom of PC Board 1. Here, I believe, is where the chip the data coming from the usb host controller is going to(CY7C64013 Cypress Semiconductor).


Chip information: (will organize later)
CY7C64013- Cypress Semiconductor - you can obtain extra information from http://www.cypress.com/
SC IND
0337 506119
G 02


JAPAN
29LV400BC-90
Fairchild 29LV400BC-90 512K x 8 Flash ROM 0325 M35S


ST232B
9A4337
ST
5V POWERED MULTI-CHANNEL RS-232 DRIVERS AND RECEIVERS

DESCRIPTION
The ST232 is a 2 driver, 2 receiver device
following EIA/TIA-232 and V.28 communication
standard. It is particularly suitable for applications
where ±12V is not available. The ST232 uses a
single 5V power supply and only four external SOP Large TSSOP
capacitors (0.1µF). Typical applications are in:
Portable Computers, Low Power Modems,
Interfaces Translation, Battery Powered RS-232
System, Multi-Drop RS-232 Networks.


SiRF
GSP2e/LP-7451
0343/DFBFBA
KRF35G
HONG KONG


Bottom of pc board:
LK95381 PCB REV A
ASSY REV A
4B050
MADE IN TAIWAN
Bottom of pcb board 2 (top antenna) 4B049 Golden chip: 24.553
342

SiRF chip: (this is the signal processor in the antenna assembly) SiRF ST
GRF 2i/LP
Y331585
GGBKDA0214
0341-HK

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If you are a visiting representative of DeLorme or any other above manufacturer/company involved in the production/components of the Earthmate and would like to contribute
information to the project... or would like me to revise the page... please feel free to contact me so we can work things out. Thank you.
lmendez19@austin.rr.com

Page last updated 3/31/2004 - 3:15 PM