AS3412 datasheet(42/85 Pages) AMSOSRAM

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[v1-00] 2016-Apr-06

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AS3412 − Detailed Description

OTP Read/Write and Load Access

With the OTP register architecture of the AS3412 it is important

to know how to access the registers for reading and writing.

Before an I²C read command can be sent there are two registers

that have to be configured prior to the desired I²C read

command. The flow chart in Figure 53 shows the correct read

access sequence. The first step is to configure the EVAL_REG_

ON register. This register enables access to the OTP_MODE

read or write to the OTP registers. By setting the OTP_MODE

registers.

Figure 53:

OTP Read Access Flow Chart

OTP Read Access Flow Chart: This flow chart shows how to successfully read from an OTP register via the I²C or

production trimming interface.

The principle for writing to a register is basically the same. The

only difference is the configuration of the OTP_MODE register,

shown in Figure 54. The first step is to enable the OTP_MODE

step is to configure the OTP_MODE register to ‘10’ in order to

select OTP write access. Now you can start writing to any OTP

Figure 54:

OTP Write Access Flow Chart

OTP Write Access Flow Chart: This flow chart shows how to successfully write to an OTP register via the I²C or

production trimming interface.

Set bit EVAL_REG_ON

in register 0x20

Set OTP_MODE

Read from desired OTP

Set bit EVAL_REG_ON

in register 0x20

Set OTP_MODE

Write to desired OTP

AS3412 Datasheet(PDF) 42 Page - ams-OSRAM AG