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7.8 VPP Specifications for One-Time Programmable (OTP) eFuses

This section specifies the operating conditions required for programming the OTP eFuses..

7.8.1 Recommended Operating Conditions for OTP eFuse Programming

over operating junction temperature range (unless otherwise noted)

PARAMETER

DESCRIPTION

MIN

NOM

MAX

UNIT

VDD_CORE

Supply voltage range for the core domain during OTP

operation; OPP NOM (BOOT)

See Recommended Operating

Conditions

VPP

Supply voltage range for the eFuse ROM domain during

normal operation without hardware support to program eFuse

ROM

NC(1)

Supply voltage range for the eFuse ROM domain during

normal operation with hardware support to program eFuse

ROM

Supply voltage range for the eFuse ROM domain during OTP

programming(2)

1.71

1.8

1.89

I(VPP)

VPP current

400

SR(VPP)

VPP Slew Rate

6E + 4

V/s

Operating junction temperature range while programming

eFuse ROM.

°C

(1)

NC stands for 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, Power Supply 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.

www.ti.com

AM6442, AM6441, AM6421, AM6412, AM6411

SPRSP56D – JANUARY 2021 – REVISED JULY 2022

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