Off the shelf controller chipset or PCB?

Started by R.G. in comp.arch.embedded14 years ago 7 replies

Hi, I'm working on a control panel-like device that has a bunch of on/off buttons (100-200), a control knob (that drives an optical encoder)...

Hi, I'm working on a control panel-like device that has a bunch of on/off buttons (100-200), a control knob (that drives an optical encoder) and an LCD display. The controller will interface with and control some software running on a PC via USB or CAT-5 or something similar. Does anyone know of some standard or off the shelf PCB/chipset solution for such a controller? It seems like a r...


PCB multiple designs surcharge

Started by linnix in comp.arch.embedded10 years ago 51 replies
PCB

Some PCB fab houses charge extra for having multiple designs combined in a board. They don't have to do any extra work or different processes...

Some PCB fab houses charge extra for having multiple designs combined in a board. They don't have to do any extra work or different processes than single design. Why do they insist on this extra charge? Some of them will waive the fee after negotiation, but this is just unnecessary hassle. I know this is very common in the industry, but why do they care about number of customer designs?...


Q) fast serial communication method

Started by J in comp.arch.embedded15 years ago 8 replies

Hi, Dears. These days, I am searching the fast serial communication method. It has some conditions. a. fast(more than 10Mbps) -- (No,...

Hi, Dears. These days, I am searching the fast serial communication method. It has some conditions. a. fast(more than 10Mbps) -- (No, Ehernet), (No, CAN bus) b. use the differential line c. (If possible) one chip solution like UART... I will use it board(PCB) to board(PCB) data exchange. Please, help me. Thank you. Suhyeong Jang. keumpyeon@daum.net


brand new PCB with variable resistance between bus lines

Started by Anonymous in comp.arch.embedded11 years ago 12 replies
PCB

INCREDIBLE!! the problem on a new series PCB, the prototype worked well but in the last version there was some resistance or short circuit in...

INCREDIBLE!! the problem on a new series PCB, the prototype worked well but in the last version there was some resistance or short circuit in the bus lines wich hangued the cpu and possibly destroyed the XCS05 (with strange white or black substance going out of the gnd or vcc pins). With a 5V supply between the line and GND we eliminated the shorts but appeared after few minutes. We try ...


Replacing LPC2478 with LPC1788

Started by Jens Gydesen in comp.arch.embedded5 years ago 11 replies

Hi, I have a lpc2478 PCB, with 16M SDRAM, 1/4 VGA LCD i. a. This board has run perfect for years. The SDRAM is 2x Micron...

Hi, I have a lpc2478 PCB, with 16M SDRAM, 1/4 VGA LCD i. a. This board has run perfect for years. The SDRAM is 2x Micron MT48LC16M4A2. In order to modernize this PCB, the cpu is replaced with the compatible LPC1788. I have problems with the SDRAM, it fails. The program crashes due to read/write errors and the LCD shows distorted displays. Does anyone here have expirencies with ...


Soldering a MLF64

Started by Anonymous in comp.arch.embedded15 years ago 3 replies

I am making a pcb for a robotics board and am debating the use of either a MLF64 package pr a TQFPK64 .the advantage of using the MLF64 is size...

I am making a pcb for a robotics board and am debating the use of either a MLF64 package pr a TQFPK64 .the advantage of using the MLF64 is size reduction. the question is: --Can MLF64 be soldered by hand using a normal soldering station. or should i spend the extra money to get it soldered from the PCB manufacturer? I do know that the TQPK package is doable by hand. --has anyone he...


BARE PCB TESTS QUESTION

Started by Enrico in comp.arch.embedded8 years ago 6 replies
PCB

Hi, I'm trying to understand how bare PCB's are tested and the differences between SMD and PTH tests. I heard of: 1) FIXTURE 2) SMD...

Hi, I'm trying to understand how bare PCB's are tested and the differences between SMD and PTH tests. I heard of: 1) FIXTURE 2) SMD TEST 3) DOUBLE SMD TEST 4) PTH TEST 5) FLYING PROBE ------------------------------------------------------------------------------------------------ ------------------------------- I also wanted to know if the following point is correct: Le


ANN: new Pulsonix version 3 PCB software released

Started by Leon Heller in comp.arch.embedded15 years ago 57 replies

I've been helping to beta test version 3 of Pulsonix for the last few months. It has now been released and is available for download...

I've been helping to beta test version 3 of Pulsonix for the last few months. It has now been released and is available for download from: http://www.pulsonix.com. Without a license it's a full working demo (up to 100 pins for schematic entry and PCB design) and Pulsonix will provide a 30 day license for a fuller evaluation on request. Pulsonix support is excellent and bugs get fixed v...


PCB in-circuit test: how do ATE machines measure resistors?

Started by Anonymous in comp.arch.embedded10 years ago 6 replies
PCB

Hi folks, does anybody know how ATE machine measures the value of a resistor placed on the target PCB? I know that ATE machines, through a...

Hi folks, does anybody know how ATE machine measures the value of a resistor placed on the target PCB? I know that ATE machines, through a bed of nail, inject a certain voltage onto the test point. Also, what happens if the resistor under measure is connected to other resistors? thanks for any help, Enrico


Testing Intel386EXTC microcontroller.

Started by learner in comp.arch.embedded15 years ago 1 reply

Hi, I have a designed a PCB that has a 512Kbits flash with Intel 386EXTC processor. I am trying to test my PCB by hooking up the data and...

Hi, I have a designed a PCB that has a 512Kbits flash with Intel 386EXTC processor. I am trying to test my PCB by hooking up the data and address lines on logic analyzer and writing simple JMP (short) instruction in 386 assembly language. I know that since my UCS is connected to CS of Flash, processor will go to FFF0h address of Flash and execute the instruction present at FFF0h. My Fla...


How to provide power to a spinning circuit ?

Started by Rodo in comp.arch.embedded15 years ago 22 replies
PCB

Hi all... I need to make a circuit that needs to spin on the shaft of a small dc brushless motor. I thought I could use a permanent magnet...

Hi all... I need to make a circuit that needs to spin on the shaft of a small dc brushless motor. I thought I could use a permanent magnet mounted on the base of the shaft of the motor (not moving) and some coils that will be spinning on the pcb. I don't know if this will work or provide enough power (need 5mA) to the spinning pcb . Any better ways ? BTW I can't seem to find a dc brushle...


PCB Layout

Started by Pegboy in comp.arch.embedded13 years ago 8 replies

I am trying to locate a serial lock/key for my old Tango PCB v2.11a software package. It is a printed circuit board design software package,...

I am trying to locate a serial lock/key for my old Tango PCB v2.11a software package. It is a printed circuit board design software package, DOS based. I have a lot of designs using this software application and have lost the serial lock/key. Does anybody know where I can purchase one of these keys? ...or know of another application that can read these files? ...or know the file form...


USB Breakout

Started by }{ in comp.arch.embedded12 years ago 33 replies

I am planning a project and would appreciate any guidance you guys could give. At the moment, I have a measurement device connected to a...

I am planning a project and would appreciate any guidance you guys could give. At the moment, I have a measurement device connected to a decoder box - the decoder box is connected to another PCB using a USB cable. If practical, I would like to break into the USB cable running between the decoder box and the PCB to modify the values on the fly. Specifically, if two digits(say char 5 a...


Vertically mounted IRDA Transceiver?

Started by Anonymous in comp.arch.embedded12 years ago 5 replies
PCB

Not exactly rocket science but all the IRDA transceivers I've found are horizontally mounted where the tranducers are "in-line" to the board,...

Not exactly rocket science but all the IRDA transceivers I've found are horizontally mounted where the tranducers are "in-line" to the board, and designed to be mounted at the PCB edge. I need a transceiver where I can mount the device in the middle of a board where the transceiver points away, normal to the PCB. I don't really want to resort to use a prism to convert a board edge emitting...


DDR SDRAM with Xilinx Virtex 2 on self designed PCB

Started by Elmo in comp.arch.embedded15 years ago 3 replies

Hello, last week I started the development and design of a PCB with an FPGA (Xilinx Virtex 2) and two DDR-SDRAMs in parallel. No big deal, I...

Hello, last week I started the development and design of a PCB with an FPGA (Xilinx Virtex 2) and two DDR-SDRAMs in parallel. No big deal, I thought, keeping in mind the most obvious design rules, i.e. combining the adress lines and separating the data and strobe (DQS) lines. But now I came across the many other signals there are, e.g. the clock signals, S0 and S1, CAS, RAS, WE, etc. My fi...


PADS to Orcad PCB Editor

Started by Joel in comp.arch.embedded11 years ago 2 replies
PCB

I'm making a circuit that uses part of an older design. I'd like to be able to keep the layout exactly the way it was on the old board. I have...

I'm making a circuit that uses part of an older design. I'd like to be able to keep the layout exactly the way it was on the old board. I have a PADS 2005 ASCII file of the old board and Orcad Capture files of both the old circuit and my new design. I'd like to import it to PCB editor. How should I go about importing all of this? Will I be able to make netlist changes in capture and have th...


How can I solder those chips on pcb board?

Started by Yu Fu in comp.arch.embedded15 years ago 2 replies
PCB

Hello everyone, I am trying to solder some chips on the pcb board I designed, but the pins on the chip is really small and spacing between...

Hello everyone, I am trying to solder some chips on the pcb board I designed, but the pins on the chip is really small and spacing between them is small too, could someone tell me how to solder this chips? and I am going to extract all the chip into breadboad level, for example, make pins connect to stand connector, so i can add more connections or remove, if my design is bad, and I can ...


Newbie: Problem programming AT90CAN128 On STK500 board.

Started by Rav in comp.arch.embedded12 years ago

Hi, I have a custom made communication gateway PCB with an AT90CAN128 microcontroller meant to control OnPCB components. The PCB card has its...

Hi, I have a custom made communication gateway PCB with an AT90CAN128 microcontroller meant to control OnPCB components. The PCB card has its own 6 PIN ISP interface that i connect to the 6 PIN ISP of the STK500 board. The STK500 board is connected to the PC through the standard RS232 cable. I am using AVR studio 4 to download the program onto the controller's flash memory. When i try to ac...


Intel 386EXTC boot up

Started by learner in comp.arch.embedded15 years ago 2 replies

Hi, I have a PCB that has a 512Kbits flash with Intel 386EXTC processor. I am trying to test my PCB by hooking up the data and address lines...

Hi, I have a PCB that has a 512Kbits flash with Intel 386EXTC processor. I am trying to test my PCB by hooking up the data and address lines on logic analyzer and writing simple JMP (short) instruction in 386 assembly language. I know that since my UCS is connected to CS of Flash, processor will go to FFF0h address of Flash and execute the instruction present at FFF0h. My Flash contains th...


Excellon Drill File - M70

Started by rickman in comp.arch.embedded4 years ago 4 replies
PCB

I am reviewing PCB Gerber files returned to me by the PCB fab house after their edits. I am not able to load the Excellon drill file oddly...

I am reviewing PCB Gerber files returned to me by the PCB fab house after their edits. I am not able to load the Excellon drill file oddly enough. It has an M70 code which GerbV flags as an error. When I look up the M70 code I can't find a definition for it other than in the rather wordy command, "M02X#Y#M70" which is called Swap Axis. I do find M70 alone in many example files. I s...