AS3412 datasheet(45/84 Pages) AMSCO

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ams Datasheet

Page 45

[v1-00] 2016-Apr-06

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AS3412 − Detailed Description

Figure 58:

OTP Programming Process

OTP Programming: This flow chart describes the OTP programming process in detail.

Besides production trimming using the I²C interface, the

AS3412 features a second unique trimming mechanism. This

very special mode enables the analog music inputs of the

AS3412 to become a production trimming input.

0x30, 0x31, 0x32, 0x33, 0x34,

0x35, 0x14 and 0x15

ANC_L and ANC_R

registers programmed

Is ALT2_ENABLE

bit set in 0x11?

Is ALT3_ENABLE

bit set in 0x13?

Start application trim to register

0x30-0x35 and 0x14 and 0x15

Start trim verification with OTP

load tests

Start alternative microphone trim

to register 0x10 and 0x11 with

ALT2_ENABLE bit set

Start trim verification with OTP

load tests

Start alternative microphone trim

to register 0x12 and 0x13 with

ALT3_ENABLE bit set

Start trim verification with OTP

load tests

Verification

OK?

Verification

OK?

Verification

OK?

Device trimming failed

Device trimming successful

Device is already trimmed. No

more trimming possible. Exit

trimming mode

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