RTC chip DS1307 issue

[aliyesami]

can't seem to find the I2C address for DS1307 chip . for PCF8574N data sheet clearly tells on how to set this address but nothing like that for DS1307 , I know this is a very popular chip so can someone guide me on this issue?

thanks

 

[wp100]

Hi,

Just type DS1307 into the "search box" above, you will find loads of examples of how to use that chip.

 

[betwixt]

From the data sheet:

The slave address byte contains the 7-bit DS1307 address, which is 1101000, followed by the direction bit (R/W), which for a write is 0.

Brian.

 

[aliyesami]

Thanks Brian !

that explained it , they call the device address as "slave address". so 0x68 is the device address.

 

[paulfjujo]

hello,

Thanks Brian !that explained it , they call the device address as "slave address". so 0x68 is the device address.

yes,it is the device adress on 7 bits,right justified,

but you have to use adresse x 2+0 for write data ...0xD0 or adressex2 +1 for read data....0xD1

 

[betwixt]

No, not 0x68.
As I stated and verified by Paulfjujo, The slave address byte contains the 7-bit DS1307 address, which is 1101000, followed by the direction bit (R/W), which for a write is 0.
So the address is 11010000 = 0xD0 when writing to it and 11010001 = 0xD1 when reading from it.

Brian.

 

[babatundeawe]

Hi;

You cant check the basic stamp forum. I really learnt much about the device there.

Tunde.

 

[aliyesami]

ok thanks for your input ,my chip will be arriving soon, cant wait to program it.