AM4376_16 Datasheet, PDF (117/266 Pages) Texas Instruments – Sitara Processors

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AM4376, AM4377, AM4378, AM4379
SPRS851C – JUNE 2014 – REVISED APRIL 2016
5.10 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 (AM437xHS) devices.
Table 5-7. Recommended Operating Conditions for OTP eFuse Programming
PARAMETER
DESCRIPTION
VDD_CORE
Supply voltage range for the core domain during OTP
operation; OPP100
VPP
Supply voltage range for the eFuse ROM domain during
normal operation
Supply voltage range for the eFuse ROM domain during
OTP programming⁽¹⁾⁽²⁾
I(VPP)
Temperature (ambient)
MIN
1.056
NOM
1.1
NC
1.65 1.7
0 30
MAX
1.144
UNIT
V
1.75 V
50 mA
50 ºC
(1) Supply voltage range includes DC errors and peak-to-peak noise. TI power management solutions TLV70717 from the TLV707x family
meet the supply voltage range needed for VPP.
(2) During normal operation, no voltage should be applied to VPP. This can be typically achieved by disabling the regulator attached to the
VPP terminal. For more details, see TLV707, TLV707P 200-mA, Low-IQ, Low-Noise, Low-Dropout Regulator for Portable Devices.
5.10.1 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 5.13.1.2).
5.10.2 Programming Sequence
Programming sequence for OTP eFuses:
1. Power on the board per the power-up sequencing. No voltage should be applied on the VPP terminal
during power up and normal operation.
2. Load the OTP write software required to program the eFuse (contact your local TI representative for
the OTP software package).
3. Apply the voltage on the VPP terminal according to the specification in Table 5-7.
4. Run the software that programs the OTP registers.
5. After validating the content of the OTP registers, remove the voltage from the VPP terminal.
5.10.3 Impact to Your Hardware Warranty
You recognize and accept at your own risk that your use of eFuse permanently alters the TI device. You
acknowledge that eFuse can fail due to incorrect operating conditions or programming sequence. Such a
failure may render the TI device inoperable and TI will be unable to confirm the TI device conformed to TI
device specifications prior to the attempted eFuse. CONSEQUENTLY, TI WILL HAVE NO LIABILITY FOR
ANY TI DEVICES THAT HAVE BEEN eFUSED.
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Specifications 117