CEC1702 datasheet(15/30 Pages) MICROCHIP

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CEC1702 Efuse Generator Tool Procedure

 2017 Microchip Technology Inc.

DS50002598A-page 15

On program execution the tool generates two folders in the output directory “Output

Dir”. These are “keys” and “out_binaries”. As the name suggests, the files for program-

ming the CEC1702 are stored in the “out_binaries” directory. The ECDH private key

(AES Encrypted), self signed certificate, ECDSA private key (AES Encrypted), ECDSA

Self Signed Certificate and their corresponding certificate requests are stored in the

“keys” directory. The pictorial representation of the same is given below:

<efuse_generator>

+---efuse

+--efuse_<YYYYMMDD>_<WHHMMSS> -> Output Dir self generated

+---keys

-> Contains all the keys

<ECDH>.pem

-> ECDH Private key AES Encrypted

<ECDH>_crt.pem -> ECDH Self Signed Certificate

<ECDH>_csr.pem -> ECDH Certificate Request

<ECDSA>.pem

-> ECDSA Private key AES Encrypted

<ECDSA>_crt.pem-> ECDSA Self Signed Certificate

<ECDSA>_csr.pem -> ECDSA Certificate Request

keys_info.txt

-> Generated Key details

key_file.bin

-> key_file.bin extracted key output

\---out_binaries

otp_efuse.bin

-> updated Binary with Efuse details

otp_efuse.hex

-> Equivalent hex file for download

\---efuse_log.txt

-> Efuse Log file

2.1.3

Key Generation Steps

Following are the steps to generate the Efuse binary and hex file for programming the

CEC1702 blank chip:

1. Click on the “CEC1702_efuseGEN.exe” program shortcut to start the application

and the GUI will be displayed as in Figure 2-1: “CEC1702 Efuse Generator

Tool Main Form”.

2. Set the openssl path as described in section 2.1.1 “Directory Structure”.

3. If “Generate Header File” is selected in Figure 2-2: “Openssl Tool Path Set-

ting”, the utility will generate a header file equivalent to the Efuse binary file. This

file may then be used to add to any project environment, if required. If “Generate

Header File” option is not selected, utility will not generate the header file.

“Genrate Header File” option must be used if the Efuse programmer tool requires

header file.

Note:

Please refer to JTAG programmer documentation for deciding which file for-

mat (.hex, .bin or .h) it requires for programming the Efuse of CEC1702.

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