lpc2100_fan wrote: > > 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. The LPC210x was the entry level I believe, the 213x is high level. I'm looking for a complete solution in a single chip, with a 1cc working volume. Virtually all of my work involves sensors of some kind, both analog and digital. It has the digital resolution, but the ADC is totally inadequate and seems out of place on such an otherwise powerful device. > 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. Therein lies the way to madness ;@}. I used to develop manufacturing processes in another life. > 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!? I understand that, but what is the use of a lot of communication channels with not a lot to communicate. Every 8 bit micro manufacturer, especially the most succesful ones, like Microchip, Moto, Atmel and now Ti (16 bit) , has managed to include decent A/D along with a rational mix of comms in a small die. I know that 32 bit buses will inflate the die size, but relatively there seems no reason to skip perhaps the most important peripheral in a market where the largest growing field is data acquisition. > 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. So 1 UART, 1 SPI/IIC, 4 A/D, 2 DAC and a few GPIO in a 28 or 40 pin QFP or MSN package. Covers a huge range of applications, larger devices can sit on top. > 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. I haven't seen firm pricing for them yet, but the budgetary quote is AUS$15 (US$11) in 260 off MOQs. This is for the LPC2106, not what I'd call a good price performance break. > > 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 ;-) Its certainly looking that way. I had hoped to evaluate the parts over the Christmas break, but AD aren't available yet. Thanks for the feedback. Al > > 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=groups/S=1706554205:HM/EXP=1103245757/A=2128215/R=0/SIG=10se96mf6/*http://companion.yahoo.com> > > > > > > > > > > ------------------------------------------------------------------------ > > > Yahoo! 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Message
Re: [lpc2000] Re: Compatibility
2004-12-17 by onestone