DS2408 Maxim, DS2408 Datasheet - Page 32

• Manufacturer Part Number: DS2408
• Description: The DS2408 is an 8-channel, programmable I/O 1-Wire® chip
• Manufacturer: Maxim

Command-Specific 1-Wire Communication Protocol—Legend
Command-Specific 1-Wire Communication Protocol—Color Codes
Read PIO Registers (Success)
Read PIO Registers (Fail Address)
Channel-Access Read (Cannot Fail)
Master to slave
RST
RST
RST
<new state>, <new
AAh, <read back>
<32 samples>,
CRC16\ loop
<new state>,
SYMBOL
<invalid>
CRC16\
AA loop
FF loop
<data>
state\>
Select
CAW
WCS
RPR
CAR
PD
PD
PD
RST
RAL
PD
TA
Select
Select
Select
Slave to master
1-Wire Reset Pulse generated by master.
1-Wire Presence Pulse generated by slave.
Command and data to satisfy the ROM function protocol.
Command "Read PIO Registers".
Command "Channel-Access Read".
Command "Channel-Access Write".
Command "Write Conditional Search Register".
Command "Reset Activity Latches".
Target Address TA1, TA2.
Transfer of an undetermined amount of data.
Transfer of an inverted CRC16.
Indefinite loop where the master reads FF bytes.
Indefinite loop where the master reads AA bytes.
Indefinite loop where the master reads 32 PIO samples followed by an inverted CRC16.
Transfer of 2 bytes, where the second byte is the bit-inverse of the first byte. The first
byte will be taken as the new PIO state.
Transfer of 2 bytes, where the first byte is a constant (AAh) and the second byte is the
current PIO state.
Transfer of 2 bytes, where the second byte is NOT the bit-inverse of the first byte.
RPR
RPR
CAR
TA
TA
<32 samples>, CRC16\ loop
<data>
FF loop
CRC16\
32 of 39
DESCRIPTION
FF loop
DS2408