components on the BS2

agentile

Hello,
· I am looking for information regarding the various individual chips on the BS2 package.· I can see 9 visible parts.· I can identify the PIC16C57 as the microcontroller, and the 20MHz oscillator is there, and there seems to be a bank of four resistors near the top.· Could someone please identify and explain the other chips on the stamp?

thank you
AG

allanlane5

There is a serial EEPROM, which is where the PBasic tokens are stored. There is probably a transistor-array, which implements an RS232 level converter. And there is a small Regulator, for reducing the Vin voltage to VDD's +5 volts.

Jim McCorison

This same question was just asked and answered in this forum yesterday.

http://forums.parallax.com/showthread.php?p=523212

Jim

agentile

Thank,

I am looking for more specifics, such as chip name and numbers, so that I can get datasheets for all.· Is that info available?



AG

Martin King

Take a look at :-

http://www.parallax.com/html_pages/downloads/basicstamps/documentation_basic_stamp.asp

And more specifically for the BS2

http://www.parallax.com/dl/docs/prod/schem/Bs2p24revB.pdf

Martin.

achilles03

Agentile,
I'd like to·warn you ahead of time based on·the possibility you're trying to make your own stamp: just putting together the components won't make a BS2.· This might not be what you're trying to do, but just in case.···

The PIC on the BS2 is pre-programmed to be able to read programs on the eeprom and execute them.··Without a preprogrammed PIC, it won't run anything.· To make a long story short, a typical BS2 project is actually running 2 programs: the one you wrote, and the one Parallax put on the PIC to execute the program you wrote.

You CAN buy a preprogrammed BS2 PIC for only $11, and it would work:
http://www.parallax.com/detail.asp?product_id=PBASIC2C/P


Dave