ADAU1701 in self-boot mode with reduced power consumption ?

SigmaDSP & SigmaStudio BerndS Feb 7, 2012 00:00 2 replies Original on forum ↗

BerndS Question

Feb 7, 2012 00:00

Hi all,

i need to know if it is possible to have the ADAU1701 (configured in self-bot mode) while powered down most of all chip sections (for reduced stand-by consumption) and observing an ADC for small signal input and start-up (function maybe called sleep mode with auto-power-on funktion) ?

Reason for this is the high current of ADAU1701 (1.8V and 3.3V) of about 100mA.

thanks

Bernd

Audio Signal Processors

power_consumption

SigmaDSP Audio Processors

adau1701

Report

ADIApproved Reply

Feb 7, 2012 00:00

Hi-

I moved this question to the SigmaDSP Community. Please continue the discussion here.

Thanks,

AndyR

EngineerZone Community Manager

Report

ADIApproved Reply

Feb 7, 2012 00:00

Hi Bernd,

You can configure the registers however you want before generating the self-boot EEPROM image, and the registers will initialize to those values on start-up.

However, the ADAU1701's DSP core does not have access to the hardware registers directly, so it is not able to modify its own register settings after start-up unless there is some external influence (for example, from a microcontroller on the I2C or SPI bus).

The best option, in my opinion, would be to configure the registers how you want in the self-boot EEPROM, and put an input monitor in the signal flow. The input monitor should output a flag to a GPIO pin (see here for an example) and an interrupt-based microcontroller monitoring that pin could then write new register settings via I2C or SPI once the input signal has been detected.

Report