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AM652X データシート(PDF) 137 Page - Texas Instruments |
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AM652X データシート(HTML) 137 Page - Texas Instruments |
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137 / 277 page  137 AM6548, AM6528, AM6546 AM6526, AM6527 www.ti.com SPRSP08I – NOVEMBER 2017 – REVISED DECEMBER 2019 Submit Documentation Feedback Product Folder Links: AM6548 AM6528 AM6546 AM6526 AM6527 Specifications Copyright © 2017–2019, Texas Instruments Incorporated 5.7 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. Table 5-14. Recommended Operating Conditions for OTP eFuse Programming(2) over operating free-air temperature range (unless otherwise noted) PARAMETER DESCRIPTION MIN NOM MAX UNIT VDD_MCU Supply voltage range for the core domain during OTP operation; OPP NOM (BOOT) See Section 5.4 V VPP_CORE Supply voltage range for the eFuse ROM domain during normal operation NC V Supply voltage range for the eFuse ROM domain during OTP programming (1) NC V VPP_MCU Supply voltage range for the eFuse ROM domain during normal operation NC V Supply voltage range for the eFuse ROM domain during OTP programming (1) 1.71 1.8 1.89 V I(VPP_MCU) 100 mA Tj Temperature (junction) 0 25 85 ºC (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. 5.7.1 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 5.9.2, Power Supply Sequencing). 5.7.2 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 Table 5-14. • Run the software that programs the OTP registers. • After validating the content of the OTP registers, remove the voltage from the VPP_MCU terminal. 5.7.3 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. |
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