Rainbow-electronics DS2784 Manual de usuario descargar pdf (Pagina 34)

DS2784: 1-Cell Stand-Alone Fuel Gauge IC with Li+ Protector and SHA-1 Authentication

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Table 11. All Function Commands

COMMAND HEX DESCRIPTION

Write Challenge 0C

Writes 64-bit challenge for SHA-1 processing. Required

immediately prior to all Compute MAC and Compute Next Secret

commands.

Compute MAC

Without ROM ID and Return

MAC

Computes hash operation of message block with logical 1s in

place of the ROM ID.

Compute MAC

With ROM ID and Return MAC

35 Computes hash operation of message block using the ROM ID.

Clear Secret 5A Clears the 64-bit secret to 0000 0000 0000 0000h.

Compute Next Secret Without

ROM ID

30 Generates new global secret.

Compute Next Secret With

ROM ID

33 Generates new unique secret.

Lock Secret 60 Sets lock bit to prevent changes to the secret.

Read Data 69, XX Reads data from memory starting at address XX.

Write Data 6C, XX Writes data to memory starting at address XX.

Copy Data 48, XX

Copies shadow RAM data to EEPROM block containing address

XX.

Recall Data B8, XX Recalls EEPROM block containing address XX to RAM.

Lock 6A, XX

Permanently locks the block of EEPROM

containing address XX.

Set Overdrive 8B Sets 1-Wire interface timings to overdrive.

Clear Overdrive 8D Sets 1-Wire interface timings to standard (factory default).

Reset C4 Resets DS2784 (software POR).

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Rainbow-electronics DS2784 Manual de usuario Pagina 34