[Boatanchors] Calling Smart People- DS-1077 Oscillator

[Brian Harris]

A little more on this....NXP Semiconductors does have a chip solution to create an i2c master from a USB port.  In reality it's a preprogrammed microcontroller in disguise.   It is quite straightforward to use but you'll need to put it on a board and provide power (from the USB port) to it.  Their website has the data sheet.  Brian wa5uek

Sent from my iPhone

On Oct 3, 2013, at 11:46 AM, Brian Harris <cosmophone at yahoo.com> wrote:

> Dave,
> 
> The 2 wire bus from Maxim is actually the I2C (I Squared C) Bus invented by Philips, a company for whom I worked for 27 years as a field application engineer.  To my knowledge you can't implement an I2C interface with the serial port for various reasons I can explain by phone.  On the other hand you can with a parallel (printer) port via a simple interface consisting of a few gates and pull up resistors or with a USB port with an adapter such as the one at the link below.
> http://www.ebay.com/itm/USB-TO-I2C-IIC-UART-TTL-Adapter-Converter-Module-3v-5v-for-CH341T-win7-/181128312345?pt=LH_DefaultDomain_0&hash=item2a2c16b619
> 
> http://www.google.com/imgres?imgurl=http://images.elektroda.net/4_1175539769.gif&imgrefurl=http://www.edaboard.com/thread92376.html&h=400&w=600&sz=20&tbnid=q4iiQ5qK8uxgrM:&tbnh=79&tbnw=119&zoom=1&usg=__wLObIXRQacD28co8x7-Nf21piBM=&docid=sT-fY-ODSFKEjM&sa=X&ei=E55NUsDCFtDvrAGwsoCoDw&ved=0CEEQ9QEwAw
>  
> Brian Harris, WA5UEK
> cell 214-763-5977
> email cosmophone at yahoo.com
> 
> 
> ________________________________
> From: David Stinson <arc5 at ix.netcom.com>
> To: boatanchors at mailman.qth.net 
> Sent: Thursday, October 3, 2013 7:02 AM
> Subject: [Boatanchors] Calling Smart People- DS-1077 Oscillator
> 
> 
> To the many people smarter than me on computers and
> itty-bitty chips:
> 
> Here's a Maxim DS-1077 Programmable Oscillator
> I want to use in a boatanchor project:
> 
> https://www.sparkfun.com/products/9089
> 
> "The DS1077 features a 2-wire serial interface that allows in-circuit 
> on-the-fly programming of the programmable prescalers (P0 & P1) and divider 
> (N) with the desired values being stored in NV (EEPROM) memory."
> 
> The datasheets have lots of good info, but as always the writers
> make assumptions that I'm smarter than I am.
> Programming I can figure-out.... I think.
> They've got some published "C" code and there's bound
> to be a freeware compiler out there.
> 
> What I need to know:
> I have a computer with an RS-232 port.
> I have a chip with two pins.
> Someone please draw me a hardware diagram of how
> I'm supposed to hook these two together.
> 
> 73 DE Dave AB5S
> 
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