TWL6040 MIC (Electret) Issue

veera venkateswara rao pusala

Other Parts Discussed in Thread: TWL6040

Hi,

I want interface the MIC with Audio Codec (twl6040), here i am using RL=2.2kohm, and C=100nF and supply voltage=2V. also i mapped registers as given below..i am not getting any signal across the output teminal.... please suggest me what changes i need to take...

Description	D7	D6	D5	D4	D3	D2	D1	D0	Value in Register (H)
MICLCTL register	X	X	X	0	1	1	1	1	OF
MICRCTL register	X	X	X	0	1	1	1	1	OF
MICGAIN register	0	0	1	0	0	1	0	0	24
AMICBCTL register	0	0	0	1	1	0	1	1	1B

Regards,

Venkat

over 14 years ago

0 veera venkateswara rao pusala over 14 years ago

Intellectual 280 points

Please answer anybody.........i am waiting for response.....

we r using analog mic and using the circuit is specified by TWL6040 data sheet.....

Regards,

Veera

0 Darwin Fernandez over 14 years ago in reply to veera venkateswara rao pusala

TI__Mastermind 41800 points

Hi Veera,

This post was moved to the OMAP4 forum.

Regards,

Darwin

0 Israel Cepeda over 14 years ago

TI__Expert 5515 points

Hi Venkat,

Looking at the values you are setting to the registers I see that you are trying to use MMIC and HMIC inputs right?

Just to be sure, have you try measuring the signal that is going to the TWL6040?, because values of the registers seems to be ok.

Also, what do you mean by: "i am not getting any signal across the output teminal", are you sure you are reading the correct UL0 and UL1 channel in PDM port?

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TWL6040 MIC (Electret) Issue