SLASF23A December 2023 – January 2025 TAC5212
PRODUCTION DATA
The TAC5212 supports ultrasonic activity detection (UAD) mode as part of low power activity detection (LPAD) schemes. In this mode, the TAC5212 continuously monitors one of the input channels for signals in the ultrasonic frequency band. The device consumes low quiescent current from the AVDD supply in this mode. This feature can be enabled by setting UAD_EN (P0_R120_D[3]) to 1'b1. On detecting ultrasonic activity, the TAC5212 can alert the host through an interrupt or auto wake up and start recording based on the I2C programmed configuration. This alert can be configured through the LPAD_MODE (P1_R30_D[7:6]) register bits.
This feature is supported on both the analog and digital microphone interfaces. For lowest power UAD, the digital microphone interface is recommended. The input channel for the UAD can be selected by setting the LPAD_CH_SEL (P1_R30_D[5:4]) register bits to an appropriate value. See the How to use the Ultrasonic Activity Detection in the TAx511x and TAx521x for further details.