DS2703 Dallas Semiconductor, DS2703 Datasheet - Page 18

• Manufacturer Part Number: DS2703
• Description: SHA-1 Battery Pack Authentication IC
• Manufacturer: Dallas Semiconductor

PROGRAMMING PULSE
A typical programming waveform is shown in Figure 10. The user issues a 1-Wire reset followed by a Skip ROMID
command, Match ROMID plus the ROMID, Search or Read Net, the Load Secret command and then the two 32-bit
words to be loaded into EEPROM. The DQ line is then pulled to V
nominal voltage. The fast rise and fall time requirements for the programming pulse are required to prevent
damage during the transition between normal communication mode and programming mode.
Figure 10. Lock Secret, Set/Clear Overdrive Function Commands
1-Wire
Reset
Presence
Pulse
SKIP ROM
Cmd
Set/Clear Overdrive
Lock Secret
Cmd
or
t
PPR
18 of 20
Programming
PP
Apply
Pulse
t
for t
PPW
PPW
milliseconds and then returned to
t
PPF