Datasheet

DS1904
8 of 13
ROM FUNCTIONS FLOW CHART F
igure 7
F0H
Search ROM
Command
?
DS1904 TX Bit 0
DS1904 TX Bit 0
Master TX Bit 0
Bit 0
Match ?
DS1904 TX Bit 1
DS1904 TX Bit 1
Master TX Bit 1
Bit 1
Match ?
DS1904 TX Bit 63
DS1904 TX Bit 63
Master TX Bit 63
Bit 63
Match ?
Master TX Control
Function Command
33H
Read ROM
Command
?
DS1904 TX
Serial Number
6 Bytes
DS1904 TX
CRC Byte
DS1904 TX
Family Code
1 Byte
Match ROM
55H
Command
?
Bit 0
Match ?
Bit 1
Match ?
Bit 63
Match ?
Master TX Bit 1
Master TX Bit 0
N
Y
N
Y
N N
Y
N N
N N
Y
Y
Y
Y
Y
Y
(SEE FIGURE 5)
Master TX ROM
Function Command
Master TX
Reset Pulse
DS1904 TX
Presence Pulse
CCH
Skip ROM
Command
?
N
Y
N
Master TX Bit 63