JAJSNO1A December 2023 – January 2025 TAC5112
PRODUCTION DATA
The power-supply sequence between the IOVDD and AVDD rails can be applied in any order. However, only initiate the I2C or SPI transactions to initialize the device after all supplies are stable.
For the supply power-up requirement, t1, t2 must be at least 2ms to allow the device to initialize the internal registers. See the Section 7.4 section for details on how the device operates in various modes after the device power supplies are settled to the recommended operating voltage levels. For the supply power-down requirement, t4, t5 and t6 must be at least 10ms. This timing (as shown in Figure 9-6) allows the device to ramp down the volume on the record data, power down the analog and digital blocks, and put the device into shutdown mode. The device can also be immediately put into shutdown mode by ramping down power supplies, but doing so causes an abrupt shutdown.
Make sure that the supply ramp rate is slower than 0.1V/µs and that the wait time between a power-down and a power-up event is at least 100ms. For supply ramp rate slower than 0.1V/ms, host device must apply a software reset as first transaction before doing any device configuration. Make sure all digital input pins are at valid input levels and not toggling during supply sequencing.
The TAC5112 supports a single AVDD supply operation by integrating an on-chip digital regulator, DREG, and an integrated analog regulator. Ensure AVDD_MODE (P0_R2_D[2]) and IOVDD_IO_MODE (P0_R2_D[1]) registers are set correctly for AVDD 1.8V operation and for IOVDD 1.8V and 1.2V operation as described in Section 9.3.1 and Section 9.3.2 respectively.