AS3412 datasheet(40/84 Pages) AMSCO

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[v1-00] 2016-Apr-06

AS3412 − Detailed Description

Independent of the OTP programming, it is possible to

overwrite the OTP register temporarily if the chip is controlled

via I²C. The chip configuration can be stored for example in the

flash memory of a Bluetooth- or wireless chipset and can be

loaded to the ANC chip during startup of the device via the I²C

interface. Because the OTP fuses upload their contents into the

OTP register at power-up, the new OTP settings from the

microcontroller will overwrite the default settings of the

AS3412. All I²C OTP registers settings can be changed as many

times as desired, but will be lost during power off.

OPT Registers and Fuses: The OTP registers are volatile

memory cells which lose the content once the device is

switched off. Multiple read and write commands are possible

but in order to store chip settings during power off mode, the

OTP fuses have to be used.

The OTP memory can be accessed in the following ways:

• LOAD Operation

The LOAD operation reads the OTP fuses and

loads the contents into the OTP register. A LOAD

operation is automatically executed after each

power-on-reset.

• WRITE Operation

The WRITE operation allows a temporary

modification of the OTP register. It does not

program the OTP. This operation can be invoked

multiple times and will remain set while the chip

is supplied with power and while the OTP register

is not modified with another WRITE or LOAD

operation.

• READ Operation

The READ operation reads the contents of the OTP

or to read the OTP memory after a LOAD

command.

• STORE Operation

The STORE operation programs the contents of

the OTP register permanently into the OTP fuses.

Don’t use old or nearly empty batteries for

programming the fuses.

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