AM6546 datasheet(139/284 Pages) TI

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

This section specifies the operating conditions required for programming the OTP eFuses and is applicable only

for High-Security Devices.

7.7.1 Recommended Operating Conditions for OTP eFuse Programming

over operating free-air temperature range (unless otherwise noted)

PARAMETER(2)

DESCRIPTION

MIN

NOM

MAX

UNIT

VDD_MCU

Supply voltage range for the core domain

during OTP operation; OPP NOM (BOOT)

See Section 7.4

VPP_CORE

Supply voltage range for the eFuse ROM

domain during normal operation

Supply voltage range for the eFuse ROM

domain during OTP programming

(1)

VPP_MCU

Supply voltage range for the eFuse ROM

domain during normal operation

Supply voltage range for the eFuse ROM

domain during OTP programming

(1)

1.71

1.8

1.89

I(VPP_MCU)

100

Temperature (junction)

°C

(1)

Supply voltage range includes DC errors and peak-to-peak noise. TI power management solutions TLV70718 from the TLV707x family

meet the supply voltage range needed for VPP_MCU.

(2)

NC stands for No Connect.

7.7.2 Hardware Requirements

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

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

• The VPP_MCU power supply must be ramped up after the proper device power-up sequence (for more

details, see Section 7.9.2, Power Supply Sequencing).

7.7.3 Programming Sequence

Programming sequence for OTP eFuses:

• Power on the board per the power-up sequencing. No voltage should be applied on the VPP_MCU 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_MCU terminal according to the specification in Section 7.7.1.

• Run the software that programs the OTP registers.

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

7.7.4 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

AM6548, AM6528, AM6546, AM6526

SPRSP52B – DECEMBER 2019 – REVISED JUNE 2021

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Product Folder Links: AM6548 AM6528 AM6546 AM6526

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