Rainbow Electronics DS2778 - Manual (Page 38)

DS2775/DS2776/DS2777/DS2778
2-Cell, Stand-Alone, Li+ Fuel-Gauge IC with
Protector and Optional SHA-1 Authentication
38 ______________________________________________________________________________________
1-Wire
RESET SKIP-ROM
COMMAND
UP TO 160 READ TIME SLOTS
(READ 20-BYTE MAC)
PRESENCE
PULSE
COMPUTE
MAC COMMAND
8 WRITE-ZERO
TIME SLOTS
WAIT FOR MAC
COMPUTATION
t SHA
Figure 25. Compute MAC Command
1-Wire
RESET SKIP-ROM
COMMAND
PRESENCE
PULSE
COMPUTE
NEXT SECRET COMMAND
WAIT FOR MAC
COMPUTATION WAIT FOR EEPROM
PROGRAMMING
t SHA t EEC
Figure 26. Compute Next Secret Command
1-Wire
RESET SKIP-ROM
COMMAND
COPY DATA
COMMAND
8 WRITE
TIME SLOTS
PRESENCE
PULSE
WAIT FOR EEPROM
PROGRAMMING
t EEC
Figure 27. Copy Data Command