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???
07/09/05 18:24
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 		 #96927 - Read the damned data sheet!
Responding to: ???'s previous message
Many years ago, our buyer had a supply problem with a PCF8583 I2C clock/calendar/256Bram. Distro said the 8573 (I think) was the same, and they had lots. Sent me a data sheet and, indeed, it was the same - couldn't understand the different device number (I believe it had a slightly different I2C address). Built the boards - failed on test. It came back to me. By this time, of course, I'd completely forgotten about the changed device. I spent a day trying to 'debug' our previously rock-solid 'bit-banged' I2C routines in the 8052. The clock and calendar locations read back fine, but once over address 0Fh - just zeroes.

I consulted the data sheet again. Yes, it was a clock/calendar/'ram', but only 7 bytes of RAM!!! The data sheet looked like an exact copy of the 8583, with edits - and I hadn't read closely enough. DAMMIT! First (and second) lessons well and truly confirmed.

Dave

List of 40 messages in thread
TopicAuthorDate
Where are my ADC's?            01/01/70 00:00      
   AD convertor and ADCs            01/01/70 00:00      
      Abbrevations Section in datahseet            01/01/70 00:00      
      Abbrevations Section in datahseet            01/01/70 00:00      
   I sympathise, but...            01/01/70 00:00      
      P89LPC924            01/01/70 00:00      
   engineering data from non-engineers            01/01/70 00:00      
      Marketing blurb            01/01/70 00:00      
         A ? D? C?            01/01/70 00:00      
            Plain advertising...            01/01/70 00:00      
               And. and. and....            01/01/70 00:00      
                  Maxim            01/01/70 00:00      
                     Me.            01/01/70 00:00      
            Lies, Damn Lies, and Marketing Blurb...!            01/01/70 00:00      
               that may be a good idea            01/01/70 00:00      
                  the bagfull of parts            01/01/70 00:00      
                     it was a bag of 10            01/01/70 00:00      
                        than that was a pure scepticism            01/01/70 00:00      
                     user-editable chiplist            01/01/70 00:00      
               Advertising blurb in UK.            01/01/70 00:00      
                  your friendly local FAE            01/01/70 00:00      
                  3-pronged attack?            01/01/70 00:00      
   Master Boxer and Sucker Punch            01/01/70 00:00      
      How...            01/01/70 00:00      
         ADC            01/01/70 00:00      
      Re: Master Boxer...            01/01/70 00:00      
         Apprentice            01/01/70 00:00      
            Re: Master.            01/01/70 00:00      
         Grasshopper!            01/01/70 00:00      
            Read the damned data sheet!            01/01/70 00:00      
   Inspection!            01/01/70 00:00      
      which ones?            01/01/70 00:00      
   Local supplier            01/01/70 00:00      
      Re: Local Supplier.            01/01/70 00:00      
         MOQ            01/01/70 00:00      
   ADC from comparator?            01/01/70 00:00      
      ADC from comparator!            01/01/70 00:00      
         single/dual-slope            01/01/70 00:00      
            Disscussed here            01/01/70 00:00      
   what I think happened....            01/01/70 00:00      

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