AS3435 datasheet(50/102 Pages) AMSCO

50 / 102 page

AS3415/AS3435 – 50

ams Datasheet, Confidential: 2014-Jun-13 [v1-30]

De tail ed De sc rip t ion

OTP Memory & Internal Registers

The OTP (one-time programmable) memory consists of OTP

registers (0x10 - 0x17 and 0x30 - 0x35) and the OTP fuses. The

OTP registers can be written as often as wanted but they are

volatile memory. It is possible to access the OTP registers using

the I²C interface for “soft programming” the part or via the

production programming interface pins (TRSDA and TRSCL). In

order to store chip configuration data to the ANC chipset, the

OTP registers are linked together with the OTP fuses shown in

Figure 65. The OTP fuse block is a shadow register of the OTP

registers that are nonvolatile memory cells. These registers

store chip parameters during power-down. Programming the

fuses can be done three times and is a permanent change. In

order to configure the ANC chipset during startup the OTP fuse

content is loaded to the OTP registers. The AS3415/35 offers 3

OTP fuse sets for storing the microphone gain making it

possible to change the gain 2 times for re-calibration or other

purposes. In order to determine the right register settings for

microphone gain in production, as well as in the engineering

design phase, the non-volatile OTP registers should be used

without OTP programming. This allows you to configure all

registers as many times as desired to find the best microphone

gain calibration data. Once all the right register settings have

been found, the OTP fuse block should be used to store these

settings.

Figure 65:

A single OTP cell can be programmed only once. By default, the

cell is “0”; a programmed cell will contain a “1”. While it is not

possible to reset a programmed bit from “1” to “0”, multiple OTP

writes are possible, but only additional un-programmed

“0”-bits can be programmed to “1”.

AS3435 데이터시트(PDF) 50 Page - ams AG