AM625 datasheet(96/235 Pages) TI

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over operating junction temperature range (unless otherwise noted)

PARAMETER

DESCRIPTION

MIN

NOM

MAX

UNIT

Operating junction temperature range while programming

eFuse ROM.

°C

(1)

NC indicates No Connect.

(2)

Supply voltage range includes DC errors and peak-to-peak noise.

7.8.2 Hardware Requirements

The following hardware requirements must be met when programming keys in the OTP eFuses:

• The VPP power supply must be disabled when not programming OTP registers.

• The VPP power supply must be ramped up after the proper device power-up sequence (for more details, see

Section 7.10.2.2.1, Power-up Sequencing).

7.8.3 Programming Sequence

Programming sequence for OTP eFuses:

• Power on the board per the power-up sequencing. No voltage should be applied on the VPP terminal during

power up and normal operation.

• Load the OTP write software required to program the eFuse (contact your local TI representative for the OTP

software package).

• Apply the voltage on the VPP terminal according to the specification in Section 7.8.1.

• Run the software that programs the OTP registers.

• After validating the content of the OTP registers, remove the voltage from the VPP terminal.

7.8.4 Impact to Your Hardware Warranty

You accept that e-Fusing the TI Devices with security keys permanently alters them. You acknowledge that

the e-Fuse can fail, for example, due to incorrect or aborted program sequence or if you omit a sequence

step. Further the TI Device may fail to secure boot if the error code correction check fails for the Production

Keys or if the image is not signed and optionally encrypted with the current active Production Keys. These

types of situations will render the TI Device inoperable and TI will be unable to confirm whether the TI Devices

conformed to their specifications prior to the attempted e-Fuse. CONSEQUENTLY, TI WILL HAVE NO LIABILITY

(WARRANTY OR OTHERWISE) FOR ANY TI DEVICES THAT HAVE BEEN e-FUSED WITH SECURITY KEYS.

AM625, AM623

SPRSP58 – JUNE 2022

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AM625 Datasheet(PDF) 96 Page - Texas Instruments