@Nagendra-yedem I'm afraid the commands of Onion I2C Python Module are not able to interpret a 2 byte / 16 bit wide register address. In these command readBytes(devAddr, addr, size), writeByte(devAddr, addr, value), writeBytes(devAddr, addr, values) 'addr' can be only 1 byte.

@Nagendra-yedem DS3231 is a "real" I2C device - it doesn't need the SMBus.

@Paul-Cousins Hi, I'm having the same error, could you please send me your code? I'd really appreciate it, thanks