Rainbow Electronics DS2784 User Manual
Page 34
DS2784: 1-Cell Stand-Alone Fuel Gauge IC with Li+ Protector and SHA-1 Authentication
34 of 38
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
36
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).