Why not use an external AD connected via SPI interface on LPC2106?! Surely there is a 8-pin device available on the market. - Henry <Schau auch mal auf meine Homepage www.ehydra.dyndns.info> <u.a. Versand von Wasserflohzuchtansatz, Wasserpflanzen/-schnecken, Futteralge Chlorella, brasilianischer Sauerklee, Natron zum Backen/Baden, Chemikalien u.a.> <Alternativ \ufffdber http://people.freenet.de/algenkocher> -----Urspr\ufffdngliche Nachricht----- Von: lpc2100_fan <lpc2100_fan@...> An: lpc2000@yahoogroups.com <lpc2000@yahoogroups.com> Datum: Donnerstag, 16. Dezember 2004 18:21 Betreff: [lpc2000] Re: Compatibility > > >Hi Al, > >from what you are describing you might want to have a look at Silicon >Labs. They have fast 8-bit micros with high resolution ADCs. The >problem might be that you pay as much for an 8-bit micro as you pay >for the low end ARM micros. >I don't know why you mentioned that you have to go to the high end ARM >offerings with Philils to find an ADC. The LPC2131, the entry level >for ARM from Philips has a 10-bit 8 channel ADC. You are right that it >also has many communication ports. >Let me give you some background information (I am involved in chip >design) about the reason why there are so many serial channels while >the ADC is, let's say OK but not great. >1. In advanced technologies, serial channels are very small and >getting smaller every day. This is very different with ADCs, they do >not get smaller, actually for many processes they even have to be >bigger using most advanced processes. So, one good 10-bit ADC might be >as big as 2 UARTs + 2 I2Cs + 2 SPIs!? >2. Different user, different serial interface. You like a UART (so do >I) but many engineers use SPI or some I2C. Missing one of them might >disqualify the micro for a large range of applications. >3. The most appealing part of the new generation of ARM micros is the >price performance ratio. You are in need for speed, so are many >others. A package of 8x8mm providing you 32k Flash, 8k RAM, 8 channels >10-bit ADC running 60 MHz (almost) 0 Wait states from Flash. > >Summary: >Your needs are probably best met by the AD devices (although they are >much slower from Flash and have a miserable Interrupt controller. The >AD device is a great ADC with a not so great microcontroller attached >to it ;-) > >Hope you find the best device for you. > >Cheers Bob > >--- In lpc2000@yahoogroups.com, onestone <onestone@b...> wrote: >> Hi Bill, thanks. The problem is that, according to the AD website their >> ARM7 offering isn't available yet, It looks the part, still has more >> memory than I want, and more peripherals, but a far better mix for my >> needs (actually all I want is an eight pin part with 2 * A/D, 2 * DACs, >> stable clock, internal timers, at 50mA the current is a bit high, and I >> assume that is core only, not all peripheals running, but I can live >> with that, it still figure I'll get a week between recharges. I'll keep >> my eyes open for parts becoming available, in the meantime it will be >> worth while using the LPC to try and ARMour myself. >> >> Cheers >> >> Al >> >> Bill Knight wrote: >> >> > Al >> > You might want to take a look at the Analog Devices ADuC700 series >> > ARM offerings. They may be more in line with what you are seeking. >> > >> > >http://www.analog.com/en/content/0%2C2886%2C117%255F%255F31068%2C00.html >> > >> > Regards >> > -Bill Knight >> > >> > PS - welcome to the ARM side of things >> > >> > >> > On Thu, 16 Dec 2004 11:00:48 +1030, onestone wrote: >> > >> > >> > Hi Kris, I'm not even sure the ARM is what I want. It seems >underdone - >> > overkill if you see what I mean. Not as bad as some other ARM devices, >> > but still too much of some things and not enough of others. >> > >> > The smallest part has 8k RAM, and 32k flash IIRC. Even the tiniest >parts >> > have more comms interfaces than NASA, But you have to get to >really big >> > parts to get an ADC, and even then it's only 10 bits. To me it's >XA'ish. >> > A good idea done badly. Philips rationale for low res ADC is that on >> > chip noise makes anything more useless. Its odd that most other >vendors >> > don't have problems here, By the time I get an ADC I've got 2 UARTs, 2 >> > SPI's IIC, a CAN of worms, and who knows what other comms interfaces >> > eating up the silicon. I don't want comms. I want to process sensor >> > data. maybe 1 UART would be fine. An SPUI or IIC as well. Sure it's 32 >> > bit, that doesn't mean it has to be a mammoth. The only reason I'm >> > looking at the ARM is it's flash base and higher execution speeds. >> > Couple that with 32 bit processing (which I could live without) >for fast >> > calcs. It also is quite low current for what it can do. So I don't see >> > it as anything more than an 8 bitter that has faster bigger number >> > crunching. Every one of the top micro suppliers, in terms of volume, >> > makes a large part of their market through small devices, low pin >count. >> > basically that's what I want. a 20 pin device that is damned fast, and >> > which eats numbers, without sucking the sort of juice that a DSP does. >> > So I'd be happy with 8K of flash, 2k of RAM, 4 A/D channels at 12 bits >> > or better, 8 capture compares, 1 UART, 1 SPI/IIC. 60MHz, slower I/O is >> > fine. I just want the built in multiplier. Philips don't even come >close >> > on their road map. >> > >> > So, although I'm having a look I don't see much of a future in it for >> > me. There are better, lower cost options on the horizon, that approach >> > the same processing speeds, at lower currents, with a more >rational (for >> > me) peripheral/memory mix. >> > >> > Al >> > >> > microbit wrote: >> > >> > > Hey Al, >> > > >> > > Nice to meet here :-) >> > > The J-link outputs onto the standard 20 pin JTAG, and should just >> > > drop into the 20 pin JTAG on MCB2100. >> > > >> > > -- Kris >> > > >> > > > Can anyone tell me if the J-Link unit that comes with the >IAR tools is >> > > > compatible with the MCB2100 board from Keil, please. >> > > > >> > > > Cheers >> > > > >> > > > Al >> > >> > >> > >> > >> > Yahoo! Groups Sponsor >> > ADVERTISEMENT >> > ><http://us.ard.yahoo.com/SIG=1290pot13/M=295196.4901138.6071305.3001176/D=g roups/S=1706554205:HM/EXP=1103245757/A=2128215/R=0/SIG=10se96mf6/*http://com panion.yahoo.com> >> > >> > >> > >------------------------------------------------------------------------ >> > Yahoo! Groups Links >> > >> > * To visit your group on the web, go to: >> > http://groups.yahoo.com/group/lpc2000/ >> > >> > * To unsubscribe from this group, send an email to: >> > lpc2000-unsubscribe@yahoogroups.com >> > <mailto:lpc2000-unsubscribe@yahoogroups.com?subject=Unsubscribe> >> > >> > * Your use of Yahoo! Groups is subject to the Yahoo! Terms of >> > Service <http://docs.yahoo.com/info/terms/>. >> > >> > > > > > > > > >Yahoo! Groups Links > > > > > > >
Message
Re: [lpc2000] Re: Compatibility
2004-12-20 by otc_friend