CTL_STATUS_t ltc2309_init_i2c(CTL_ADC_t *self, CTL_I2C_BUS_t *bus, int addr);
ltc2309_init_i2c initializes the LTC2309 self on I2C bus bus using the 8-bit I2C address addr.
ltc2309_init_i2c returns a standard status code.
ltc2309_init_i2c is thread-safe if a mutex is associated with the I2C bus bus.