Alternative RTC for AXE033

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greencardigan

Senior Member
Is there an alternative RTC I can use in the AXE033 module that uses a different i2c address to the DS1307?

I have a MCP3424 ADC on an Arduino shield with both address pins pulled low giving the same address as the DS1307.
 
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westaust55

Moderator
Let's say that it is highly unlikely unless the chip is larger with more pins for addressing.
The first 4 bits of i2c device slave addressing is the same for all chips of the same generic type. Thus all memory chips start with %1010.... whether they are EEPROM, F-RAM or RAM.
 
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Dippy

Moderator
The Phillips/NXP PCF6563 has a different I2C Address to DS , and a nearly but not quite the same pinout.

I suggest looking around a bit before doing surgery.

Go to big supplier websites e.g. Farnell and Digikey and RS Components and do a search. They will have data sheets which you can download and study.
They may give links to maufacturer's websites where you can get the information you require.
 
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greencardigan

Senior Member
The proposed surgery is not that bad. I think I only have to cut 1 track which will leave one of the address pins floating.

But I'll have a quick look anyway.
 
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westaust55

Moderator
Dippy said:
The Phillips/NXP PCF6563 has a different I2C Address to DS , and a nearly but not quite the same pinout.

I suggest looking around a bit before doing surgery.
Click to expand...
Pcf8563 ?

Slave addr is %1010 0010


Or pcf8583
Slave address is %1010 00a0 where a is 0 or 1
This has 240 bytes of RAM with timer/counter/interrupt


Neither have a battery backup pin
 
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Dippy

Moderator
Oops, typo. But my point still holds... as you have discovered :)

I found 4 typos in a 10 page Infineon Data Sheet so I feel quite good about that ;)
 
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Dippy

Moderator
Aha, well there we go.
Data Sheets (usually) rule OK ;)
... reading them helps I hear.


As an old sage once said: "Assume" can often make an "ass" out of "u" and "me" :).
 
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