When my customer test TAS5751EVM，pull RST and PDN pins low, external power supply 3.3V. Find that whether the SDA and SCL of I2C will be pulled down for a short time when power is on. To be precise, it will appear at the first power-on of continuous power-on and power-off. When SDA drops, the 3.3V, SCL and SDA waveforms all oscillate. The specific waveforms are shown in Figure 1.
Andy Liu │TI Analog FAE