Email: Password: Remember Me | Create Account (Free)

Back to Subject List

Old thread has been locked -- no new posts accepted in this thread
???
10/27/08 09:27
Read: times


 		 #159377 - observations till 2 pm IST
Responding to: ???'s previous message
OBSERVATIONS UNTILL NOW ARE,

1> I2C routines are working fine with DS1307 at 86k bitrate, but not with 24c16
2> After reducing the bitrate (to 25k, oscilloscope says 24.23k) also outcome is same
3> SCL & SDA are checked using oscillosope. Waveforms were fine during write(writing with fix no 0x55), but while reading can only see ACK sent by MCU(rest of the times SDA is held HIGH.
4> Values on reading are sent on UART for checking, all found to be 0xFF
5> Pins A0, A1, A2 & WP are at GND potential, SCL & SDA are showing waveforms, Supply pin is also recieving 5.2V (pdf says 2.7 to 5.5V)
6> Changed EEPROM IC, used another at24c16 still having same problem. Even used at24c04 but has same problem.
7> Value of S1CON is also monitored & found ok.

Regards,
Mahesh


List of 25 messages in thread
TopicAuthorDate
PROBLEM IN I2C WITH P89C668            01/01/70 00:00      
   Oscilloscope            01/01/70 00:00      
   Check your hardware I2C addressing            01/01/70 00:00      
   Re to David & Per            01/01/70 00:00      
      Reducing the bit-rate is irrelevant            01/01/70 00:00      
         you can, with VERY minor modifications ...            01/01/70 00:00      
   observations till 2 pm IST            01/01/70 00:00      
      check your hardware again            01/01/70 00:00      
         Re: david            01/01/70 00:00      
            A complete mystery            01/01/70 00:00      
   NEW DEVELOPEMENT            01/01/70 00:00      
      A good test setup            01/01/70 00:00      
         Re: A good test setup            01/01/70 00:00      
      Write your name to the DS1307 RAM            01/01/70 00:00      
         DS1307 max RAM is.....            01/01/70 00:00      
            My data sheet says RAM 0x08 to 0x3F            01/01/70 00:00      
               Sorry David            01/01/70 00:00      
                  Please post your code.            01/01/70 00:00      
                     not 12 individual writes            01/01/70 00:00      
                        Without the code this will go on forever            01/01/70 00:00      
            i2c code            01/01/70 00:00      
               Code?            01/01/70 00:00      
               WHY ON EARTH ...            01/01/70 00:00      
                  Mahesh has a problem with HIS code            01/01/70 00:00      
               I have added code-tags to Praveen's i2c code            01/01/70 00:00      

Back to Subject List