AM261...ZCZ datasheet(96/218 Pages) TI2

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

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

6.9.1 VPP Specifications

over recommended operating conditions (unless otherwise noted)

PARAMETER

DESCRIPTION

TEST CONDITIONS

MIN

NOM

MAX UNIT

VDD

Supply voltage range for the core

domain during OTP operation(1)

Normal Operation, R5F =

400MHz

1.140

1.200

1.260

Normal Operation, R5F =

500MHz

1.188

1.250

1.320

VPP

Supply voltage range for the eFuse

ROM domain

Normal Operation

No Connection

Supply voltage range for the

eFuse ROM domain during OTP

programming

OTP Programming

1.65

1.7

1.75

I(VPP)

VPP Current

I(VPP)

100

Ambient Temperature

℃

(1)

See Section 6.5 for more information

6.9.2 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-on sequence (for more details, see

Section 6.11.2.1, Power-On and Reset Sequencing).

6.9.3 Programming Sequence

Programming sequence for OTP eFuses:

• Power on the board per the power-on 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 VPP Specifications.

• Run the software that programs the OTP registers.

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

6.9.4 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.

AM2612, AM2611, AM2611-Q1, AM2612-Q1

SPRSPA7C – SEPTEMBER 2024 – REVISED JULY 2025

www.ti.com

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Product Folder Links: AM2612 AM2611 AM2611-Q1 AM2612-Q1

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