Info and help required for ADC0838 chip

Gogs

I requireinformation on how the ADC0838 chip is wired up to the Stamp2P OEM chip. Also whether any projects have been done with this chip before that show the source code used. I have how the ADC0831 was connected before because of the manuals.

Much appreciated.

Franklin

http://www.parallax.com/Portals/0/Downloads/docs/books/edu/Web-BasicAnalogDigital-v1.4.pdf

Page 45 shows how it is connected and some sample code starts on page 48.

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- Stephen

Gogs

Cheer for that you are a great help.

Gogs

It is the ADC838 I want to now whether there is any diagrammes or programming info. This is an 8 bit 8 channel ADC.

Franklin

Sorry, It looks like it would use shiftin and shiftout to communicate but I know of no code for this chip.

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- Stephen

voodoofish

The link I provided mentions the adc0834 which by design should be similar to the 838 (download the datasheet for this part as it's got helpful info)
The 838 has two additional pins(se - shift enable, and com - commmon out(?)) that from the datasheet, need to be grounded or pulled high depending on what you are doing.
Just modifiy the code for the extra channels...they also give some good suggestions as well for searching google....this is where I found the below link....

if you don't need all of the channels that the 8 provides I'd grab an 834 since it'll be easier to connect. if you do need em all, well...google is your friend [noparse]:)[/noparse]

http://forums.parallax.com/forums/default.aspx?f=5&m=82651&p=1&ord=d

---[noparse][[/noparse]edit]---
this gives you the pinouts and some code, I'm not sure if you need to do anything special for a 2p though
http://stuff.mit.edu/afs/net.mit.edu/user/foley/Classes.old/AUP/Ad0838.bs2

Post Edited (voodoofish) : 7/17/2008 8:17:24 PM GMT

MSDTech

The ADC0831 family all use similar coding. With the ADC0832 through ADC0838, you need to send a command to tell the ADC which channel you want to use. Download the data sheet for ADC0831, as it covers the ADC0838 also.
The code for the ADC0838 would look like:
ReadVoltages:
HIGH PM_V_CS 'Deactivate the ADC0834 Voltage Monitor
LOW PM_Clk
LOW PM_Din
DataValue = 0
'A2D_Start_Conversion
LOW PM_V_CS
SHIFTOUT PM_Din,PM_Clk,MSBFIRST,[noparse][[/noparse]VoltSelect\4]
PULSOUT PM_Clk,10 '20 uSec for data conversion
SHIFTIN PM_Dout,PM_Clk,MSBPRE,[noparse][[/noparse]DataValue.LOWBYTE]
HIGH PM_V_CS
RETURN
Where VoltSelect is a constant you get out of the datasheet for the input you want to measure.

Gogs

Thanks, the MIT program is a good program to start with. I need to integrate 11 analogue channels in all. Anyone know roughly how long it would take to do this?