Upgrading EMMI 2D - something gone wrong!? - GSM-Forum

kafer · 08-01-2003, 23:29

Well folks, thank you for you help, I updated my fw to 625010...

I've found 625010 fw update in old posts, opened emmi 2d and found MCU rom E28f800B3TA so I used nokia 5130 and update flash. But something is going wrong because my box is inoperational. The problem is not in firmware - I hope so.

For all wants to know in EMMI 2D - taiwan or chinese made - is:
1. Motorola 68332 MCU with external oscil. 32.768 kHz (software sets prescaler to higher work. freq.)
2. BIC (by moto ASIC) 43E08 connected to osc. 8.1MHz and ser.eeprom I2C 24C16
3. MCU ROM E28F800B3TA - this holds firmware
4. MCU RAM Samsung's KM616U10000BLTI - static ram
5. flash ROMs intel StrataFlash E28F320J5120 4 pcs.
6. flash RAMs Samsung's KM616FS1000TI
7. ttl latches and gates, some passive components and trasistors

All of this componets are operational to supply 3.3V to 3.6V - BUT I found 7805 - 5.0V stabiliser in the box. Box worked for 2 years - not so stable but finishing job. Now starts ok, initialises, after 20-40 sec. 7805 over heats and stops the emmi, not even after reset can be initialised. Now I am asking if someone know why is it not working now with old (625000 when I put it back) and new (625010) firmware,? Is there anyone who can guide me to repair that EMMI 2D?

If someone can help let me know, other don't make guesses.

Thanks

keylimesherbet · 08-02-2003, 10:11

I used the 62.50.10 firmware I found in an older post to upgrade my EMMI tonight from 64.48.37. I removed the 28F800 and put it in a satellite receiver which has a JTAG interface, programmed and then soldered back into the EMMI. So far its working fine so the firmware is good(I'm sure we got it from the same place)

I can only think that the flash chip in your EMMI is either damaged or more likely you have a solder bridge somewhere that you haven't seen yet...(my 28F800 is a B5 model which is 5 volts so if your regulator is overheating it does seem like a shortcircuit)

If you think I can help further let me know.

KLS

kafer · 08-02-2003, 11:02

Flash is good, also the solderrings joints.
I have made 3.5V stabilizer with LM317T to power all electronics in box. Also add 7805 to power up max232 serial i-face circuit.

The problem is located in 32.786kHz oscilator connected to XTAL and EXTAL pins of 68332. I can not make it working stable!

When I give external freq. box is working very stable, especialy in EMMI or LOGGER mode with GsmKey (firmwares xx.13.xx and xx.14.xx).

Who has expirience with motorola 68k in hardware design? How to stabilize external oscil. freq.?

TriMesh · 08-10-2003, 14:34

There are a couple of things that come to mind:

1) These MCUs don't like the xtal connected directly to the pins - there is a recommended circuit in the data sheet - IIRC, it has a high value (10M?) resistor connected between the two xtal pins on the CPU, a 330K drive limiting resistor in series with XTAL and a pair or small caps (18/22pF?) between the ends of the xtal and ground.
2) The onboard VCO uses external decoupling on its power (VDDsyn) - place these caps as close to the physical pins on the CPU as possible. The loop filter cap (0.1uF) to the XFC pin should have short leads, and should use VDDsyn as it's reference.
3) Make sure you clean the board carefully - especially around the loop filter. If you leave the flux on the PCB, it will probably work fine for a while, and then become unstable as it absorbs moisture from the air.

That's all I can remember - it's been a while

(I just noticed how old the original post was - but I'm going to leave this response here in case it's ever useful in the future

Siemens man · 08-10-2003, 19:17

mmm............

kafer · 08-13-2003, 12:28

U are right! I have downloaded 332 manual and:

On bord design was with 9.8M and 470k res. Changed them to 10M and 360k. Capacitors 22pF. Also interesting Vdd ref. for XTAL was leaved unconnected.

Box is working now but New Problems arrive...
BIC (ref. with 8.10000MHz) can't be syncronised for very long time (less than 40 sec.) when WHITECAP phone (like V50) is connected.
Can someone help me with BIC's registers?

08-01-2003, 23:29	#1 (permalink)
kafer Junior Member Join Date: May 2003 Location: Nis Posts: 31 Member: 29931 Status: Offline Thanks Meter: 0	Upgrading EMMI 2D - something gone wrong!? Well folks, thank you for you help, I updated my fw to 625010... I've found 625010 fw update in old posts, opened emmi 2d and found MCU rom E28f800B3TA so I used nokia 5130 and update flash. But something is going wrong because my box is inoperational. The problem is not in firmware - I hope so. For all wants to know in EMMI 2D - taiwan or chinese made - is: 1. Motorola 68332 MCU with external oscil. 32.768 kHz (software sets prescaler to higher work. freq.) 2. BIC (by moto ASIC) 43E08 connected to osc. 8.1MHz and ser.eeprom I2C 24C16 3. MCU ROM E28F800B3TA - this holds firmware 4. MCU RAM Samsung's KM616U10000BLTI - static ram 5. flash ROMs intel StrataFlash E28F320J5120 4 pcs. 6. flash RAMs Samsung's KM616FS1000TI 7. ttl latches and gates, some passive components and trasistors All of this componets are operational to supply 3.3V to 3.6V - BUT I found 7805 - 5.0V stabiliser in the box. Box worked for 2 years - not so stable but finishing job. Now starts ok, initialises, after 20-40 sec. 7805 over heats and stops the emmi, not even after reset can be initialised. Now I am asking if someone know why is it not working now with old (625000 when I put it back) and new (625010) firmware,? Is there anyone who can guide me to repair that EMMI 2D? If someone can help let me know, other don't make guesses. Thanks

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08-02-2003, 10:11	#2 (permalink)
keylimesherbet Junior Member Join Date: Jul 2003 Posts: 7 Member: 35852 Status: Offline Thanks Meter: 0	I used the 62.50.10 firmware I found in an older post to upgrade my EMMI tonight from 64.48.37. I removed the 28F800 and put it in a satellite receiver which has a JTAG interface, programmed and then soldered back into the EMMI. So far its working fine so the firmware is good(I'm sure we got it from the same place) I can only think that the flash chip in your EMMI is either damaged or more likely you have a solder bridge somewhere that you haven't seen yet...(my 28F800 is a B5 model which is 5 volts so if your regulator is overheating it does seem like a shortcircuit) If you think I can help further let me know. KLS

08-02-2003, 11:02	#3 (permalink)
kafer Junior Member Join Date: May 2003 Location: Nis Posts: 31 Member: 29931 Status: Offline Thanks Meter: 0	Flash is good, also the solderrings joints. I have made 3.5V stabilizer with LM317T to power all electronics in box. Also add 7805 to power up max232 serial i-face circuit. The problem is located in 32.786kHz oscilator connected to XTAL and EXTAL pins of 68332. I can not make it working stable! When I give external freq. box is working very stable, especialy in EMMI or LOGGER mode with GsmKey (firmwares xx.13.xx and xx.14.xx). Who has expirience with motorola 68k in hardware design? How to stabilize external oscil. freq.?

08-10-2003, 14:34	#4 (permalink)
TriMesh Freak Poster Join Date: Dec 2001 Location: Shenzhen, China Posts: 327 Member: 7911 Status: Offline Thanks Meter: 7	There are a couple of things that come to mind: 1) These MCUs don't like the xtal connected directly to the pins - there is a recommended circuit in the data sheet - IIRC, it has a high value (10M?) resistor connected between the two xtal pins on the CPU, a 330K drive limiting resistor in series with XTAL and a pair or small caps (18/22pF?) between the ends of the xtal and ground. 2) The onboard VCO uses external decoupling on its power (VDDsyn) - place these caps as close to the physical pins on the CPU as possible. The loop filter cap (0.1uF) to the XFC pin should have short leads, and should use VDDsyn as it's reference. 3) Make sure you clean the board carefully - especially around the loop filter. If you leave the flux on the PCB, it will probably work fine for a while, and then become unstable as it absorbs moisture from the air. That's all I can remember - it's been a while (I just noticed how old the original post was - but I'm going to leave this response here in case it's ever useful in the future

08-10-2003, 19:17	#5 (permalink)
Siemens man No Life Poster Join Date: Apr 2001 Location: IN CASTLE Age: 46 Posts: 5,798 Member: 3925 Status: Offline Thanks Meter: 22	mmm............

08-13-2003, 12:28	#6 (permalink)
kafer Junior Member Join Date: May 2003 Location: Nis Posts: 31 Member: 29931 Status: Offline Thanks Meter: 0	U are right! I have downloaded 332 manual and: On bord design was with 9.8M and 470k res. Changed them to 10M and 360k. Capacitors 22pF. Also interesting Vdd ref. for XTAL was leaved unconnected. Box is working now but New Problems arrive... BIC (ref. with 8.10000MHz) can't be syncronised for very long time (less than 40 sec.) when WHITECAP phone (like V50) is connected. Can someone help me with BIC's registers?