Hi, i need to attach a NXP-PN532 to i2c-0, but the adr: 0x48 is already in use by pcf8591. The problem is, that there is no chance to change the addr of the pn532. Any suggestions how to change the addr of the pcf8591 ? Best regards, Jonny
I2C 0x48 in use by pcf8591
Is the fixed address for the PN532 the same as the PCF8591? Below you will find my original response and then I thought if the fixed part can't be changed then the fixed parts must be different. Searched the PCF8591 datasheet for 0x48 and don't see any. Is the fixed part of the address set at manufacture and where do you find out what it is?? ******** Are you using the Matrix code? In my Matrix application I am using PCF8591_AIN_CHANNEL0 which I find in libfahw-pc8591.h #define PCF8591_ADDRESS (0x48) //PCF8591 address From the datasheet: Each PCF8591 device in an I 2 C-bus system is activated by sending a valid address to the device. The address consists of a fixed part and a programmable part. The programmable part must be set according to the address pins A0, A1 and A2. Could that the "fixed part" in that #define be changed and re-compile the code?
Hi, i think the PCF8591 ist anywhere at the nanopi neo board, because it is found by i2cdetect whiout any other modules conneted. My question is: is it possible to deaktivate the builtin PCF8591 ? Best regards, Jonny
Wonder what they are using it for? Check on the schematic. I am sure one could deactivate it but that means some software changes and a re-compile.