LC25D is not 100% pin-compatible with the u-blox NEO modules, because the RTS/CTS pins (18 and 19) are shared with SCL/SDA. Is it ok to have an I2C EEPROM connected to the RTS/CTS pins if i am not planning
a module reflash ?
Dear Sir
Is it an LC29D module? Can you share the schematic diagram of the NEO module?
Best wishes!
Dear Albert.Liu,
the module is LC29DA and it does not work with the I2C EEPROM connected to the RTS/CTS pins,
probably because of the pull-up resistors.
Cheaper u-blox NEO modules without SQI flash use external I2C EEPROM for storing configuration settings.
They are not pin-compatible with LC29DA because of the different D_SEL,SDA,SCL pin usage.
LC29DA uses a subset of the u-blox UBX protocol for configuration and RAW measurement data output.