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| * TEXAS INSTRUMENTS - MAX232N - IC, TRANSCEIVER, 5V[http://uk.farnell.com/jsp/search/productdetail.jsp?SKU=1470445 Farnell] | | * TEXAS INSTRUMENTS - MAX232N - IC, TRANSCEIVER, 5V[http://uk.farnell.com/jsp/search/productdetail.jsp?SKU=1470445 Farnell] |
| * RESISTOR, 2.2K, 0.125W, 1% [http://uk.farnell.com/jsp/search/productdetail.jsp?SKU=9342834 Farnell] | | * RESISTOR, 2.2K, 0.125W, 1% [http://uk.farnell.com/jsp/search/productdetail.jsp?SKU=9342834 Farnell] |
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| == Other ==
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| === MCUs (ATTiny) ===
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| This section added by Daveb who is looking for more info...
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| see [http://www.atmel.com/Images/doc4064.pdf ATMEL's AVR and AVR32 - Quick Reference Guide] for useful info.
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| ATTiny rather than an ATMEGA as it is smaller and lots cheaper or would use an arduino or similar.
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| ATTiny rather than other MCUs for good free tool (GCC etc) support.
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| Doing searches on Farnell reveals lots of choices, with big price breaks (~40%) for 10 and (~20%) for 100. Price seems to roughly scale with pin count or maybe chip size.. but there are anomalies. It is worth picking a chip and buying a few. But how to choose the chip??
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| Points that matter to me..
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| * enough RAM for interrupt vectors, global state variables, C stack, local variables and interrupt stack
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| * excess code space for diagnostic code
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| Prototyping
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| * a few excess pins to allow for in-crcuit reprogramming and debugging (which i think means dont use MOSI,MISO,SCLK or RESET in the application)
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| An 8 pin dip has 2 pins available to the app (4 debug plus vcc and gnd), while a 14 pin dip has 8 app pins? Four times the app space for under 2x the size:)
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| in the farnell catalogue at moment i see some standouts.. These are all 8kflash, 512byte ram parts.
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| * Not in stock - [http://uk.farnell.com/atmel/attiny84a-pu/mcu-8bit-avr-8k-flash-14pdip/dp/1972172 ATTiny84A-PU] 14 DIP, 1.8 to 5.5v, at upto 20Mhz, ADC with 1x, 20x prescale, £1.90(units), 1.39(10s), 1.28(100s)
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| * [http://uk.farnell.com/atmel/attiny85-20pu/avr-mcu-8k-flash-512b-ram-spi/dp/1455162 ATTiny 85-20PU] 8 DIP, 2.7 to 5.5v, at upto 20 Mhz, £2.36(units), 1.36(10s), 1.14(100s)
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| * [http://uk.farnell.com/atmel/attiny861a-pu/ic-mcu-8bit-8k-flash-20pdip/dp/1841627 ATTiny861A-PU] 20 DIP, 1.8 to 5.5v, upto 20Mhz, 3PWM, ADC with 1x, 8x, 20x and 32x prescaler :) £2.10, 1.72, 1.48
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| I like this prescaler, can see it simplifiying some designs.
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| The part that started my investigation - only 1k flash and 64bytes of ram - one 8 bit counter and no prescaler for the ADC.
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| * [http://uk.farnell.com/atmel/attiny13-20pu/ic-8bit-1k-flash-mcu-dip8/dp/9171550 ATTiny13 8 pin DIP] 2.7 to 5.5v, upto 20Mhz, £2.48(units), 1.55(10s), 1.13(100s)
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| * [http://uk.farnell.com/atmel/attiny13a-pu/ic-mcu-8bit-avr-1k-flash-8pdip/dp/1704566 attiny13a 8 pin dip] new version, 1.8v to 5.5v, upto 20Mhz, £2.48, 1.38(10s), 1.31(100s)
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| ---
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| In stock now :)
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| * 1x [http://uk.farnell.com/atmel/attiny85v-10pu/avr-mcu-8k-flash-512b-ram-dip8/dp/1455165 attiny85-10pu] 1.8v to 5.5v, 10MHz (after I took 1)
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| * 1x attiny13-20pu
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| ==Personal requests== | | ==Personal requests== |
