4 Digital Microphone Power Consumption

The PDM typical current consumption table describes the typical current consumption of TAA52xx devices when the inputs of the digital microphone are used with an external PDM modulator. The ADC inputs are configured as PDM inputs by:

• Configuring one of the GPIOx or GPOx pins as a PDM clock. This configuration is accomplished by configuring the appropriate GPIOx_CFG or GPOx_CFG bit field, respectively, to PDM clock output.
• Configuring the GPIx or GPIOx as the general-purpose input function.
• Configuring the ADC channels as the PDM inputs (PDM_CHx_SEL). With this configuration, the PDM input data is latched on the edges of the PDM clock input.
• Configuring the PDM_DIN1(for PDM channel 1 and channel 2) and PDM_DIN2 (for PDM channel 3 and channel 4) to the expected GPIOx or GPIx pins (PDM_DINx_SEL).
• Enabling the ASI channel 3 and channel 4 (PASI_TX_CH2_CFG and PASI_TX_CH3_CFG) to the required slots on the ASI bus.
• Configuring the PDM clock frequency, generated by the device, using register P0_R53 (MST_CLK_CFG0).
• Enabling the ADC channels (CH_EN) and powering up the ADC (PWR_CFG).